Gas boiler for underfloor heating - choice. Choosing an economical boiler for warm water floors. The history of the appearance of a condensing gas boiler

For comfortable and cozy atmosphere the apartment needs to maintain optimal temperature conditions.

Often centralized heating is not enough for this.

An alternative could be a heated floor with a heating boiler.

Water heated floor

One of the most effective and popular heating systems is water heated floors. It consists of a coil located under the floor screed and connected to a closed circuit led by the boiler. The circulation of coolant through the coil is carried out by a pump.

The peculiarity of a water heated floor is that it does not require a high-temperature coolant; 40-45°C is sufficient. However, due to large area heat exchange, air heating is carried out evenly and efficiently. After all, the coils are located at the lowest point of the room, exactly where cold air accumulates.

Boilers for heated floors

In the process of arrangement autonomous system heating, the question will arise about choosing a boiler. Boilers are classified according to the type of fuel they burn: solid (coal, firewood, pellets), liquid (diesel fuel, kerosene, waste oil, fuel oil), gaseous (natural gas, propane).

The most convenient, efficient and unpretentious units are:

Electric boiler for heated floors.
Gas boiler for underfloor heating using natural gas.

Electric boiler for heated floors

Electric boilers are units that heat the coolant using electrical energy. They are very efficient, their efficiency reaches 99%. Despite this, their operation requires large financial costs, since electricity is more expensive than any fuel and gas in particular.

Advantages of an electric boiler:

high efficiency;
Fire safety;
absence of combustion products;
simplicity installation work;
possibility of complex programming and remote control;
there is no need to create a separate room.

Flaws:

high cost of electricity.
energy dependence.

It is advisable to use an electric boiler for a warm water floor to heat small areas with good thermal insulation, then their operation will be more economical and cost-effective.

Often, electric boilers are installed as backup equipment in case of failure of the main one.

Choosing an electric boiler

A boiler for a warm water floor must provide uninterrupted and efficient heating of the room in automatic mode. Therefore, the choice of unit is based on several basic characteristics:

Thermal power of the unit - it should be enough for the area of the room.
The level of automation of the boiler operation (programming ability temperature regime, overheating protection, etc.).
Level of protection against air humidity.
Connection to 220 or 380 V network.
Boiler design and convenience of the control module.
Manufacturer.

Largest boiler manufacturers:

RisNIT – Russia.
Ferroli - Italy.
Dacon - Czech Republic.
Eleko – Slovakia.
Protherm - Slovakia.
Viesmann - Germany.

If the boiler will be located in a small apartment, then it is best to choose a silent model.

Gas boilers for heated floors

A gas boiler is a unit that heats the coolant by burning gas. Autonomous gas heating is one of the most efficient and economical types, because gas is a fairly cheap fuel.

Advantages of gas boilers:

cheap fuel;
high level of automation;
When burning gas, fewer harmful substances are released for environment compared to other types of fuel;
some models of gas boilers can be completely energy independent;
high efficiency.

Disadvantages of gas boilers:

Gas is a fire hazard.
The need to arrange a system for removing combustion products outside the premises.
The need to install additional equipment (gas analyzers, gas pressure sensors, etc.).
High cost of equipment compared to electric or solid fuel units.
The room for installing a gas boiler is subject to strict requirements (room volume, ventilation, communications, finishing, etc.).

The use of a gas boiler for a heating system with heated floors

A gas heating unit is used as the main heat source for heating the coolant. However, the use of such a unit becomes unprofitable if the heated area is less than 90 square meters.

The use of gas boilers in apartments is permitted, but the installation process is somewhat difficult due to the arrangement of the chimney. Therefore, they are mainly used for heating private houses.

Choosing a gas boiler for underfloor heating

As mentioned earlier, the temperature of the coolant for a heated floor should be lower than usual. But in traditional boilers it is necessary to maintain the return temperature within certain limits established by the manufacturer.

This creates inconvenience during operation, since the heating area of heated floors is quite large and the coolant cools down significantly.

The problem of maintaining temperature disappeared with the creation of modernized units - condensing gas boilers. Their efficiency increases several times compared to traditional analogs, and most importantly, the return temperature should be as low as possible, which goes well with the use of heated floors.

What else to look for when choosing a gas boiler for heated floors:

Thermal power of the unit (depends on the heated area).
Type of combustion chamber (open, closed).
Type of installation (floor, wall).
Dependence on electricity.
Level of automation, possibility of complex programming and remote control.
Unit design.
Manufacturer.

The power of the heating unit is calculated by calculating the heat losses of the room, taking into account the area of walls, ceilings, windows and doors. You can use the following formula: 2 kW of unit power per 1 m2 of room area, if the ceiling height is 2.5 m.

The leading manufacturer of gas boilers for water floors is Viessman, whose boilers are distinguished by their durability and quality. The products of Buderus also deserve attention.

For heated floors in small apartment An electric boiler or a gas condensing boiler is suitable. If it is not possible to install a chimney, you should opt for the electric option.

Water-based heated floors have become loved by many developers. Almost everyone who is considering building a house wants heated floors for heating. In this situation, the question of choosing a boiler for heating water heated floors always remains open.

Of course, every boiler is capable of heating heated floors, but not everyone is able to do this with maximum efficiency. Therefore, in this article, let's talk about boilers that are ideal for water heated floors.

Water floors are primarily a low-temperature heating system. It works efficiently when the coolant is heated at only 45 C. Many elevate this fact as almost the main advantage, emphasizing that such “low temperature” allows saving. On the one hand, this is true. On the other hand, on the contrary, you may start overpaying without knowing about the features of some boilers.

But if you choose a boiler that is designed for low-temperature operation, then only in this case can you really start saving.

And now about these representatives in order.

Efficiency of underfloor heating from a gas boiler

Since gas is the most popular type of fuel in our country, we’ll start with it. Many people buy gas boilers for water heated floors without thinking about how they will have to overpay later.

As many people do:

They are installing the boiler
Set the temperature on it to 45-55 degrees
They rejoice

As a result, they don’t notice that they are overpaying extra money. Because of which? It’s simple - ordinary gas boilers reach maximum efficiency at maximum operating temperatures. And they are equal to 70-90 degrees.

If you see a proud figure from the manufacturer “The efficiency of our boiler is 94%,” then keep in mind that in the passport it will definitely indicate that this applies only to high operating temperatures. In low temperature mode, performance drops to 80-85%.

Also, low-temperature operation of a gas boiler entails the formation of condensation. And this negatively affects the service life of the boiler.

Of course, such boilers can be adapted for efficient operation of water heated floors. To do this, of course, you will have to complicate the system a little.

If you have, then by using a mixing module, the efficiency of the boiler can be immediately brought to the maximum level.

And now what i can do? Don't buy gas boilers for heated floors? In fact, there is a type of gas boilers that are designed for underfloor heating. These boilers are called condensing boilers. Such boilers receive extra energy just from the condensate that forms. At low operating temperatures, the boiler efficiency is close to 100%.

Sectional view of a condensing boiler

Heat pump. We pay a lot, we save even more

A heat pump is also an ideal “boiler” for a water heated floor. It costs an exorbitant amount of money and takes an indecently long time to pay off. But at low operating temperatures it is capable of producing a conversion coefficient of 1 to 6. That is, from 1 kW of energy expended it can produce 6 kW of thermal energy.

We wrote about the principle of operation. There you will find all the secrets of work warm pump and why this transformation occurs. But in short, this device is capable of converting the Earth's energy into thermal energy.

Heating of heated floors with electricity

The next boiler for water heated floors that we will consider will be electric. These models have been studied inside and out. They didn’t come up with anything particularly ingenious either. Pitfalls like gas boilers, No.

Therefore, take what you like, set the desired heating temperature and rejoice.

Some models of electric boilers have special operating modes for a water heated floor system. Whether such features provide any benefits or not is an open question. Therefore, take the boiler model at your own discretion.

The main disadvantage of such boilers is that they consume a lot of electricity and require separate wiring. Well, most often they fail faster than gas and solid fuel boilers.

What about the other boilers?

As was said at the beginning of the article, any boilers can be used to heat a water heated floor, but there are only a few ways to do this as efficiently as possible. As for the other models, let's look at them briefly.

Solid fuel boilers

Still, focus on long-burning models. So at least you will deprive yourself of an unscheduled registration in the boiler room. Also provide yourself with a buffer capacity to avoid unnecessary problems when heating a water heated floor with a solid fuel boiler.

Diesel boilers

Expensive and impractical in most cases. But if you want, then why not?

Pellet boilers

A separate article was also written about them. We recommend reading it. If you want such a boiler for yourself and there are available raw materials nearby, then a pellet boiler will be a good device for a water heated floor.

Heating a house or apartment in winter and its costs are of concern to almost everyone. A warm water floor, which you can install yourself, will be a good solution to the problem. Pipes through which hot water circulates are connected to the boiler (or other heating system). The advantages of this system: low energy costs and the ability to independently regulate the temperature in the room. It is very important to choose an economical boiler that is most suitable for specific conditions. The most important indicator will be the thermal power of the heating equipment.

Boilers for heated floors

Boilers are divided into single-circuit and double-circuit boilers.

Single-circuit boilers. Single-circuit boilers in the heating system provide only heating of the coolant (only room heating is possible). To expand the scope of application of single-circuit boilers (providing hot water) additional devices required:

storage boilers (providing hot water supply);
heat exchangers;
mixing units for heating circuits;
and other.

Double-circuit boilers- multitasking devices: provide heating and water heating. The second function is performed by equipping the boiler with a built-in flow-through heat exchanger or a built-in storage boiler.

Variety of boilers by installation type:

floor-mounted (power up to 120 kW);
wall-hung (power up to 35 kW).

Wall-mounted boilers (most often these are atmospheric devices) are more convenient from an installation point of view and require lower costs.

A boiler with a closed combustion chamber does not require additional space in the form of a separate room. Wall-mounted boilers are equipped with a circulation pump and other equipment for the boiler room. To put it into operation, it is enough to connect the heating pipeline and hot water pipes to it. Boilers with built-in storage boilers of 100 l are a ready-made mini-boiler room

Types of boilers for warm water floors

To equip a warm water floor, boilers running on gas, electricity, solid or liquid fuel are used. Each type has its own advantages. The most economical are gas ones, and the most autonomous are diesel ones.

Gas boilers. The body of gas boilers can be made of steel or cast iron. Steel units are distinguished by their low weight (about half the weight of cast iron with the same power), small dimensions and good maintainability. Cast iron devices are larger and more expensive. Floor-standing gas boilers of the modern generation are suitable for main gas and liquefied gas. The small dimensions of the wall-mounted gas boiler allow it to be placed in any convenient place, and a power of 7-30 kW is enough for a small cottage.

Diesel boiler runs on diesel fuel and is highly efficient and productive. There are no unpleasant odors during equipment operation. Other advantages of this type of boiler include ease of installation, ease of maintenance and control, high efficiency and low fuel consumption. Liquid fuel boilers thanks to a special operating mode based on a gradual decrease in water temperature under conditions elevated temperature environment, are economical and environmentally friendly.

Solid fuel units for the installation of water heated floors will be a completely autonomous source of heat supply. They are considered a good alternative to liquid fuel, gas and other types of heating equipment. Fuel combustion occurs according to the following scheme: firewood laid on a grate is set on fire. After this, the boiler door closes and the smoke exhauster turns on. In the inner chamber of the boiler, the firewood is exposed to high temperatures (250–750°C) without access to oxygen. Charring occurs and wood gas is released, which heats the thermal media. Scope of application of solid fuel boilers: residential and industrial premises, agricultural facilities.

Electric boilers suitable for residential and non-residential buildings equipped with water underfloor heating. The system is connected to the boiler using special equipment and additional devices. The choice of device power is influenced by the area of the room, its condition and other factors. The most optimal power can be selected in rooms with good thermal insulation of walls and ceilings (for example, in new buildings). If there good thermal insulation, then the manufacturer considers 12 kW of power sufficient for heating 150 sq.m.

For tandem " electric boilers- warm water floors,” manufacturers recommend the following combinations:

heating area 250-450 sq. m - boiler power 36 kW;
heating area 220-350 sq. m - boiler power 30 kW;
heating area 140-300 sq. m - boiler power 12-24 kW;
heating area up to 70 sq. m - boiler power about 6 kW;
heating area up to 30 sq. m - boiler power 6 kW.

Electric or liquid fuel boiler?

To compare two types of boilers, all factors must be taken into account. Despite the cheapness of diesel fuel compared to electricity, an assessment of all costs will show the real picture.

Initial costs for purchasing equipment and installation costs
An electric boiler is a ready-to-use device. A liquid fuel unit will require additional costs for the purchase of a boiler, mounted burner, and fuel storage tank. The difference in consumables is 2.5 times in favor of the electric one.

Installation of an electric boiler will cost several times less, since everything necessary elements for control and safety of equipment are built into its body. Liquid fuel device needs installation additional accessories: chimney, fuel tank, mounted burner.

Operating costs
Maintaining an oil boiler requires expenses (several hundred dollars per year) for regular maintenance and cleaning. An additional inconvenience arises from the need regular orders for fuel delivery. Electric boilers do not require the listed operations.

Nevertheless, electrical devices also have disadvantages.

To operate the boiler, several tens of kilowatts of energy are required (1 kW per 10 m2 of area. The ceiling height is up to 3 m, and the room is well insulated). It is not possible to allocate such a volume of electricity in all areas.
The cost of electricity is high and power outages occur. To protect against frequent power outages, a backup solid fuel boiler is often used.

If water heating is done in a house or apartment within a large city, then electric boilers are the most preferred of all types. This is due to strict environmental requirements and coordination problems.

Having analyzed the situation, we can highlight a number of advantages of electric boilers:

low cost;
compactness and light weight;
easy installation, no chimney required;
safety (no open flame);
ease of operation;
can be installed in any room;
service is simple;
environmentally friendly: no emissions and odors;
silent.

Boiler selection parameters

Heating installations, depending on their characteristics, provide different thermal efficiencies and are suitable for a certain area and operating conditions.

Power. The required parameter is determined by the area of the heated room and the level of its thermal insulation. The manufacturer indicates the area for which the boiler is designed, provided that the building is well insulated. If heat losses are unknown, then it is necessary to choose a boiler whose power is designed to heat an area 25% larger than the actual one. It is not advisable to purchase equipment with excess power, as the device will overheat and break down. If the boiler is installed in an unheated room, it is necessary to involve a heating specialist to calculate the power.
Possibility of power control. Gas installations may or may not be equipped with a power control system. To adjust the operation of the equipment, automatic mode or manual control can be used. Automatic control systems are more economical. In this case, the user only sets the necessary parameters, and the automation ensures the accuracy and smooth supply of the gas mixture to the burner. Also, when using automation, the frequency of complete shutdown of the burner is reduced, thereby increasing the service life of the equipment.
Energy dependence. The use of electronics in the control system of electric pumps for forced circulation increases the productivity of the boiler, but at the same time depends on the stability of the energy supply and reduces its autonomy.
Type of water heating. If it is necessary that the boiler (including industrial gas device) provided not only the heating function, but also heated water for domestic needs, it is necessary to select dual-circuit model, which heats water in flow mode. If greater productivity is needed, then you need to go with the cumulative option. Boilers can be built into the boiler or autonomous and connected to the installation. Remote models can have a very large volume (several hundred liters), while built-in ones are limited by the dimensions of the boiler.

How to calculate the power of a boiler for water heating?

It is necessary to calculate the required power of thermal equipment for the right choice boiler The approximate required power for heating a country house is calculated based on the following data: to heat 10 m2. area, 1 kW of power is required, that is, it is assumed that the specific power is 100 W/m2.

The calculation is quite rough, and it is suitable for a brick house with low heat loss: the building must be well insulated, the ceilings must be no more than 3 meters high, metal-plastic windows with double glazing.

To increase the life of the heating system and thermal reserve, it is necessary that the coolant temperature be at the level of 65–75°C. To do this, the boiler power (under ideal conditions) is increased by 20–25%.

Any additional load requires an increase in power. In the case of providing hot water using storage boiler you need to add another 30-40%.
If in the future it is planned to expand the heated area, install a heated water floor, or a heated water pool, then the boiler must be purchased immediately with a capacity designed for further changes.

If the heated floor is planned as an element that complements radiator heating and increasing the comfort of living, then its heat output is considered no higher than 50 W/m2.

Requirements for installing a gas boiler

Premises requirements:

A separate non-residential premises is required for the boiler room.
The ceiling height in the room is at least 2.2 m.
Room volume based on 7.5 m3 per boiler.
The floor area per boiler is 4 m2.
Doorway width from 80 cm.
The window size is determined from the calculation: for every 10 m2 of area - a window measuring 0.3 m2.
There must be a hole for air flow (8 cm2 per 1 kW of boiler power).
The boiler must be installed at a distance of at least 0.1 m from the walls that plastered or wall finishing made of non-flammable materials.
Installation of devices near fire-resistant walls is permitted if they are insulated with roofing steel laid on an asbestos sheet with a thickness of at least 0.3 cm.

Communication requirements

Characteristics of the electrical network: single-phase current, voltage 220 V, current 20 A. An individual circuit breaker is installed. Grounding is provided.
A shut-off unit is installed on the gas main, one for each boiler.
Water supply and the possibility of connecting it to the heating and hot water supply (DHW) systems of the building.
The sewerage system provides emergency drainage from the water supply and boiler systems.
Communication parameters (gas pressure in the gas main, water pressure, etc.) must comply with state standards.

Having worked through everything possible options, you have decided to use water heated floors to heat your home. All that remains is to choose and purchase a water heating installation to work with these floors, and here the question arises - how to choose the right boilers for heated floors. The purpose of this article is to help resolve issues related to choosing a boiler, servicing the system floor heating.

Boiler selection criteria

There are no special water heating installations designed for heated floors. True, some manufacturers of gas units offer models with a “warm floor” operating mode, but this is only a built-in function for limiting the water temperature. The fact is that radiator circuits and underfloor heating have different coolant temperatures. In the first case, it reaches 95 ºС, and in the second – a maximum of 55 ºС, while the average temperature in the floor contours is 35-40 ºС. In the “warm floor” mode, the automatic heat generator limits it at 45 ºС and it turns out that boilers of a certain power work together with underfloor heating at half capacity, and this is irrational.

Any type of boiler can service water heated floors; it’s all a matter of properly piping it and connecting it to the heating circuits so that the boiler’s thermal power is used as efficiently as possible. To begin with, let’s define the criteria by which it is necessary to select a boiler installation that serves water floor heating:

compatibility with underfloor heating systems;
efficiency;
ease of operation and maintenance;
complexity of installation.

This list does not include the cost of heating, because every homeowner strives to use the most affordable energy source for heating. For some it is natural gas, for others it brings in cheap firewood, and for others it is profitable to heat with electricity due to the fact that a multi-tariff electricity meter is installed in the house. Therefore, our task is to consider all possible options so that everyone can make a reasonable choice of a boiler for a warm water floor.

The degree of compatibility of heating equipment with underfloor heating circuits is the ability of the boiler to maintain a low coolant temperature at a sufficiently high flow rate. If this is not possible, then additional equipment must be provided to reduce the water temperature and at the same time ensure flow taking into account the power of the heated floor.

The efficiency of the heat generator affects energy consumption, and ease of use is determined by the time that the homeowner devotes to heating equipment. That is why these criteria must be taken into account when selecting a heat source, as well as the complexity of installation work and piping, which affect the initial investment of money.

First, we list and then consider in detail all types of boilers for warm water floors:

electrical;
gas;
solid fuel;
on liquid fuel.

The ideal option in all respects is an electric boiler, regardless of its type (heating element, electrode or induction). Expending 1 kW of electricity to produce 1 kW of heat, the unit absolutely calmly maintains the temperature of the coolant at a given level, without losing any efficiency. When installing underfloor heating in small houses the heat generator can be connected to the circuits directly by setting it to the required temperature.

As for large cottages, in this case, electric boilers for heated floors are connected to the system through a distribution and mixing unit, which will be discussed below. The units are fully automated and do not require intervention in their operation, as well as frequent maintenance or cleaning. Again, they do not require chimneys, making installation very easy. The only drawback is the availability of the necessary electrical power from the network; otherwise, an electric boiler is the best that can be offered for underfloor heating.

Advice. Since the system itself for connecting a water heated floor requires the presence of electricity for the operation of the circulation pump, when choosing a heat source you should not focus on its energy independence. You still can’t do without electricity here.

Gas boilers

Theoretically, natural gas heat generators can maintain water temperature at 40-45 ºС, but they lose their efficiency. Why? It's simple: the heat exchanger of the installation is calculated based on normal operating conditions with a coolant temperature of 80-90 ºС and a difference between the supply and return pipelines of 20-25 ºС. Then the heater produces the declared thermal power. In our case, a gas boiler for underfloor heating should provide an average temperature of 40 ºC with a difference between supply and return of 10 ºC. The efficiency of the unit will inevitably drop by 10-15%, so connecting a gas boiler directly to heated floors is not recommended.

To combine gas heating equipment with underfloor heating circuits without loss of efficiency, you need to use a mixing unit with a circulation pump and a room distributor. How to do this is shown in the diagram of heated floors with a gas boiler:

In the main circuit with the boiler, water circulates with a temperature curve of 80 / 60 ºC, driven by a pump in the boiler room. Inside all underfloor heating circuits, the coolant with a 40/30 ºC schedule moves another pump, and a three-way valve mixes hot water from the external network into them as needed. This connection of a water heated floor to a gas boiler allows the entire system to function reliably and economically. In this case, intervention in its operation is not required; as for installation, the costs here will be higher than in a situation with an electric heater.

All of the above equally applies to diesel (liquid fuel) units. By technical specifications and the degree of automation they are close to gas, therefore diesel fuel is also carried out through a mixing unit that performs distribution functions.

Solid fuel boilers

This type of heat generators requires constant attention and maintenance, and in terms of compatibility with heated floors they are the most problematic. The exception is pellet boilers, but they also need to be visited more often than gas or electric ones. In order to maintain the temperature of the coolant during wood burning at least at 60 ºС, the automation has to constantly “strangle” the firebox, limiting the flow of air, so a solid fuel boiler for heated floors will also lose efficiency.

To avoid this, it is best to use a large-capacity buffer tank or a hydraulic accumulator in the circuit. Then the unit will be able to fully use the combustion heat of firewood, transferring it to water in containers, and underfloor heating will take from it as much as required. This way you can increase the pause between fuel loadings. Below is a diagram of connecting a heated floor to a boiler burning different types biomass:

As can be seen from the diagram, installation of a heating system from a solid fuel boiler will be the most difficult and expensive thing that must be taken into account when choosing a heat source.

Conclusion

From all that has been said above, we can conclude that the most convenient and cheapest option is to install an electric heater, a little more complicated and expensive to install a gas heater, and the most expensive and inconvenient is a solid fuel boiler. Do not forget about the construction of the “pie” and the base of the heated floor, which also costs a lot of money. How this will pay off later is up to each homeowner to decide in their own life situation.

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Boiler for water heated floors: how to choose and connect

To create comfortable conditions, owners of mansions and apartments are increasingly seeking to install innovative heated floors, one of the varieties of which functions by supplying water heated to a certain temperature into pipes laid in a certain way. In this case, it is important to correctly select a boiler for water heated floors that meets all the requirements and is suitable for specific conditions.

Requirements for boilers included in the floor heating system

Boilers, being one of the most important devices in a water-heated floor system, must meet a number of requirements, the fulfillment of which guarantees durability flawless operation:

power sufficient not only to heat the system when calculating its maximum load, but also having a regulatory safety margin;
available installation algorithm;
clear operating diagram;
resistance to a fairly wide temperature range;
efficiency.

Features of electric boilers

In terms of the degree of autonomy, one of the key criteria on which a boiler is selected, its electric version is in the lead, due to the absence of flammable substances. Having automatic settings, it does not require human intervention, automatically restoring the mode in cases of a short-term power outage. Its reliability, compactness, affordable price.

Installing a heated floor with such a boiler does not require expensive piping, thanks to the initial temperature of the water, which is the coolant, at 25°C. It is enough to mount a collector to connect several circuits.

Connecting a heated floor to the boiler

A modern electric boiler for a warm water floor has three varieties.

Safe electric boilers operating on heating elements have already received recognition, as they have a fairly simple technical structure. The main weakness of this type of device is the short service life of the heaters, which is compensated by their low cost and simple technology replacements.
Electrode boilers are a fairly new type of heating equipment, characterized by durability. Compared to the previous analogue, they are more capricious, since flawless operation requires a certain composition of the coolant, which must conduct current. This is due to the operating principle of such a boiler: between two electrodes under an alternating voltage of 50 Hz, placed in a liquid, the movement of ions begins, releasing heat. Positively charged particles move towards the cathode, and negatively charged ions move towards the anode. The electrodes change polarity 50 times per second, so heating occurs quickly.
Induction models are based on heating a conductor placed in a magnetic field. The role of the core is played by the boiler body in the form of a labyrinth through which water flows. Such a device is reliable, requiring only monitoring of the constant presence of coolant in the system. The widespread use of induction boilers is limited by their high cost.

Environmentally friendly, not polluting the atmosphere of the house with combustion products, the electric boiler is convenient because it can be placed almost anywhere. The only difficulty may be the need for local wiring. Among the disadvantages, there is an increase in energy consumption (consumption per 30 cubic meters ≈ 1 kW/hour). In private households where frequent power outages are possible, it is advisable to install combined view, providing an option for a backup boiler with solid fuel.

Characteristics of gas models

Modern modifications of gas boilers must be equipped electronically controlled regulating temperature parameters, ensuring the safe operation of the system.

In order for the automation and circular pump for a warm water floor to work in the event of a power outage, it is advisable to stock up on a local source. Car batteries will provide several hours of operation. In situations where there is a risk of frequent power outages for several days, you will have to purchase a diesel generator.

Compared with electric model The gas boiler is an example of efficiency. Its condensation type is especially effective, receiving integrated heat from fuel combustion (explicit energy) and from steam condensation (latent thermal energy).

The principle of operation of the boiler is based on the circulation of the coolant through the exchanger, during which it is heated by the flue gases produced when the fuel burns. During the transfer of thermal energy, the gases are cooled, and at a certain temperature condensation is formed, causing the appearance extra heat. This feature significantly increases the efficiency of heating equipment.

Gas boilers function flawlessly under conditions of uninterrupted gas supply, without requiring special routine maintenance techniques. In designs that provide an electronic mechanism for igniting the boiler, the operation of the burner is regulated in accordance with the specified temperature values with the removal of all harmful combustion products through forced ventilation. Boilers with piezo ignition, operating automatically, also stop the flow of gas if the flame goes out, but combustion is restored manually.

Connection to a gas boiler

In order to properly connect the water heated floor for the boiler, you should select an autonomous room. Installing such a system in a standard apartment will require qualified consultation.

Connecting a heated floor to the boiler

The installation algorithm includes a number of stages, taking into account the correct connection of the water collector for the heated floor, which serves as a guarantee of further flawless operation.

Installation of a collector at the selected location, which serves the important function of maintaining the water circulation in the heated floor system, as well as for combining, if necessary, with existing heating sources.
Placement in the manifold cabinet of a return pipe, which serves to direct the cooled coolant back to the boiler, and a pipe that supplies heated water directly to the system. They are equipped with a shut-off valve, allowing the water to be shut off in emergency situations.
Connection to a metal valve via compression fitting pipes leaving the gas boiler. The collector input is then connected to it. Using fittings, the heated floor circuits are subsequently connected.
To ensure uninterrupted circulation of liquid, a pump is mounted on the supply pipe. The most rational option for perfect functioning is the version with a thermostat.
Test run of the system.

Connection to the heating system

The comfort of heated floors, which create a uniform thermal background throughout the entire volume, is difficult to overestimate. They acquire particular relevance in autonomous residential buildings, and are used even in apartments where it is possible to install local heating equipment, since connecting a water-heated floor to the heating system coming from the central boiler room is prohibited for several reasons:

low quality coolant;
exposure of pipes to significant hydraulic resistance;
the risk of destruction of system elements from water hammer.

Using your own heating system requires the presence of a mixing unit that lowers the temperature of the coolant, since when heating a house the liquid heats up to 75 ÷ 90°C, and for the floor ≤ 50°C is allowed.

The sequence of work includes several stages:

Simultaneously with the sensor, it is securely fixed on the inlet pipe circulation pump.
A mixing valve (preferably a three-way valve) is connected to the warm pipe of the heating system.
Exit check valve, installed on the outlet pipe, is connected respectively to the heating return pipe with a branch leading to the mixing valve.

Functioning of floors heated by a heating system

The liquid from the hot pipe of the heating system is mixed with cold water to the desired temperature in a three-way mixing valve. Then, using a pump, it is supplied to the heating circuit of the floor, placed in the required sequence. Having passed the entire area and given off heat, one part of the liquid enters cold pipe heating system, and the other is sucked in for subsequent use in the mixing unit.

The temperature sensor regulates the coolant parameters by controlling the operation of the three-way valve and pump. Having made a test run after complete installation, the degree of comfort of the achieved floor surface temperature is assessed. If there are problems, the sensor is adjusted to decrease or increase the initial values. You can adjust the three-way valve to the desired volume of coolant supply.

You can use a two-way tap or a supply valve with a thermal head equipped with a sensor that controls the opening or closing intervals of the pipe supplying coolant to the floor circuit. The addition of hot water in such a device is not constant, as in the previous case, but is carried out only during the interval when the tap is open. A bypass must be provided, which is equipped with a safety valve that is activated if the pressure at the inlet to the manifold becomes critical. Part of the water is discharged into the return line, which prevents the floor from overheating.

Connecting a heated floor to the boiler

Manifold - connecting the heated floor to the heating system

Connecting the heated floor

Installation and connection of heated floors

Warm floor - do-it-yourself connection

Connecting a heated floor to a central heating system

dekormyhome.ru

How to make a water heated floor from a gas boiler?

By giving preference to autonomous heating methods, homeowners want to solve the problem of heating an apartment or house once and for all. Independent heating not only provides optimal temperature conditions in residential premises, but also provides significant cost savings in the family budget. It’s up to you to decide which type of autonomous heating you prefer. First, let's get acquainted with the main existing home heating options, based on the energy they consume:

Electrical devices.
Solid fuel devices.
Liquid fuel units.
Gas appliances.

Each of the listed groups is divided into subgroups according to the installation method, the coolant used, the area of application, etc. But to this list of devices used as the main means of heating a home, it is necessary to add systems involved in the heating process as additional devices that increase comfort temperature conditions in the room. Such systems include so-called heated floors, electric and water.

Be sure to read: independent heating in the apartment.

Of particular interest in this regard is a water heated floor, operating from a gas boiler - an autonomous hot water generator. The system is relatively new, but has been sufficiently studied and is superior in efficiency to devices such as, for example, heated fans.

Warm floor - idea and concept

The idea of installing heated floors in residential premises is not new. Man has long paid attention to the laws of physics operating around us - warm air indoors always accumulates at the top, under the ceiling. The cooled air, on the contrary, sinks down, making the floor the coldest place in the room, eating up precious kilocalories with its large area.

A floor artificially heated to a certain temperature becomes a powerful source of heat in the room. Due to the large heating area, the air is evenly heated and rises, filling the entire internal space. The air exchange process ensures the required temperature in the room, and minimizes the difference between its values at the floor level and at the ceiling. In rooms equipped with heated floors, there are practically no areas with cool air.

Gas boilers used today for home autonomous heating are quite capable of providing normal work warm water floor. It is possible to achieve an effective increase in comfort in this situation if certain conditions are met - accurate thermal and hydraulic calculations, competent installation of the underfloor heating system.

Concept

Floor heating can be ensured by laying a pipeline in the existing space between the floor and the floor covering, in which the coolant heated by the gas boiler will circulate. The coolant is water (ordinary or with special additives against freezing) - a traditional liquid used for autonomous boiler equipment.

The heat exchanger in this case is a pipeline laid under the floor covering. The effect is achieved due to the large heat transfer area. The amount of heat entering the interior space is sufficient for the horizontal and vertical distribution of warm air mass.

Important! The fundamental difference between this system and other types of heating systems is the low temperature of the coolant. For a warm water floor, it is enough to heat the coolant to a temperature of 30-50 0 C.

Components of the “warm water floor” system

Main structural elements such a system are:

a gas boiler;
injection pump;
shut-off valves and connecting fittings;
the main pipeline for distributing coolant through residential premises;
floor mini-pipeline for laying on the surface of the subfloor;
collector;
system of automation and adjustment of operating modes.

A gas boiler

For a private house with a large area, where it is planned to increase the comfort of the temperature regime in a large number of rooms, optimal choice There will be a floor-standing double-circuit gas boiler in an autonomous version. Such units have great power and are capable of simultaneously solving several problems at once - heating residential premises and providing hot water supply.

Note: for floor-mounted gas heating equipment, it is necessary to equip an appropriate room with a chimney and ventilation. The room allocated for the boiler room (boiler power up to 30 kW) must have an area of at least 4 square meters, and a minimum volume of 8 cubic meters. If a single-circuit gas boiler is used for heated floors, then DHW systems you will have to install an additional boiler indirect heating, which may be placed in the same room.

For an apartment where everyone is precious square meter area, you can use a wall-mounted gas boiler, which, when correct selection capacity will also provide effective work water heated floor. Due to their dimensions, it is easier to find a place to place such equipment; gas boilers wall-mounted It is permissible to install even in the kitchen or bathroom. Typically, the power of wall-mounted gas boilers varies in the range of 7-30 kW.

Wall-mounted autonomous gas appliances in most cases have a closed combustion chamber, so for efficient and safe operation it is enough to equip a coaxial chimney with access to the street or to the central chimney shaft.

An important point when purchasing equipment is to determine the optimal power of the gas boiler, which will have to ensure the operation of the “water heated floor” system, therefore, when choosing a gas boiler model, it is necessary to rely on thermal calculation data.

For reference: for heating 1 sq. m of living space requires approximately 100 W of electricity, provided the room is well insulated, ceilings are no more than 3 m high and there are no excess windows.

Most premises of a private house have external walls in their design, heat loss through which may require an increase of up to 150 W in heat costs to heat 1 square meter. living space. Therefore, when purchasing a gas boiler, even having a thermal calculation indicating the required power of the unit, it is better to purchase a device that exceeds the calculated value of this characteristic by 15-20%.

In most cases, the power of double-circuit boilers is designed for hot water supply with one or two water intake points. Therefore, with an increase in the number of hot water intake points, an increase in boiler power will be required.

In this regard, a water heated floor has an advantage - it loads a gas boiler in a gentle mode. The principle of operation of the underfloor heating system in this situation requires minimal energy consumption from the boiler to heat the coolant. Most of the boiler power is released to heat the water in the hot water supply system.

Pipes for water heated floors

To lay a warm water floor, copper, polypropylene, metal-plastic or PEX pipes are used.

Copper pipes (high thermal conductivity, durability) are the ideal material for installing water-heated floors, so their price is high and availability is limited.

Polypropylene pipes are also not very common, but for a different reason - their flexibility is insufficient, and the minimum bending radius of the pipe must be equal to 8 of its diameters, which moves the turns away from each other.

Metal-plastic pipes are deservedly popular - the internal aluminum coating provides them with good thermal conductivity, and the polymer shells protect them from damage. With such characteristics, an affordable price is a good incentive to choose them.

PEX pipes are a material made of “cross-linked” polyethylene, that is, with an artificially modified molecular structure that makes this material strong and durable. The price of PEX pipes is quite affordable, and therefore their use in the construction of water-heated floors is widespread. However, one specific property of this material should be kept in mind - PEX pipes, when heated, tend to take on their original contour, therefore, when laying on the floor, they must be rigidly fixed to the screed reinforcement.

The heating system is not installed in one day, so its reliability, including tightness, and durability must be ensured. For this purpose, pipes are laid in a single solid coil, without joints. The task is to obtain a single, closed loop, through which the coolant will circulate, for which it is better to use water with special additives. This will prevent the system from defrosting during severe frosts. This measure is relevant for owners of country houses and cottages with temporary residence.

Important! When using water in the system, it is necessary to install an additional protective device, a compressor or a cylinder with compressed air for emergency purging of the entire circuit and draining the coolant.

Important! When buying pipes for a heating system, pay attention to the markings. Products intended for heating systems have corresponding symbols and designations. As a rule, this permissible pressure is 10 bar and the heating temperature is up to 95 0C.

Depending on the characteristics of the room and the type of floor covering (screed thickness, room height, etc.), pipes with a diameter of 16-20 mm are used to install a warm water floor system. During pipeline laying, a minimum bend radius equal to five times the diameter is allowed for metal-plastic pipes and 8-fold - for polypropylene material.

To complete the picture, we suggest that you familiarize yourself with the video material, which describes and shows in detail how the installation of a water heated floor is carried out.

Installation of a water heated floor system

The installation of a water heated floor system begins with preparing the base, which includes several operations, which we will now briefly consider. Failure to comply with the requirements for the subfloor on which the heated floor is installed is fraught with, at a minimum, a decrease in the efficiency of its operation, and at a maximum, depressurization followed by expensive major repairs.

Preparing the base

The foundation must be prepared accordingly before laying the pipeline. The base surface must be hard, clean and level. Height differences are allowed in the range of plus or minus 10 mm per meter of linear length. If the floor surface does not meet the requirements, has a large curvature and obvious flaws, a leveling screed is installed, followed by waterproofing of the base in case of depressurization of the system.

Before laying the pipeline, the subfloor is also insulated. For these purposes, slabs of extruded polystyrene foam or basalt fiber with a thickness of 30-50 mm are used.

If you have a sufficient budget, it is justified to use slabs shielded with foil and equipped with special protrusions for convenient pipe laying. Such measures are resorted to to reduce heat losses through the floor in the premises of the first floor - a warm floor together with a gas boiler of any power will work with increased load simultaneously with floor heating to heat the basement or someone else's apartment on the floor below.

Important! Before pouring the laid pipes of the underfloor heating system with cement mortar, it is necessary to stick a strip on the walls around the perimeter of the room damper tape 5 mm thick and width equal to the thickness of the layer of mortar being poured. The tape will compensate for the thermal expansion of the screed and reduce its pressure on vertical structures.

Installation

Based on their design and, accordingly, installation method, water heated floor systems are divided into 2 types:

concrete (poured);
flooring

In the first case, we are talking about pouring concrete on the contour of a water-heated floor system laid on a prepared base. This operation is preceded by dividing the base into sections and laying the reinforcing mesh.

The following types of installation of heat pipes are used:

snake;
double snake;
spiral;
offset spiral;
combined method.

The diagram shows how a heating circuit is installed in a room with increased heat loss - two or more external walls.

Important! After the installation of the underfloor heating system is completed, it is pressure tested under a pressure of 5 Bar for 24 hours.

The concrete screed acts as an additional element participating in the heat distribution process. Taking into account the poor tensile performance of concrete, it is laid at a pressure in the heat pipe system of 3 bar, reducing the tensile load with further supply of water to the operating pressure.

For the screed mortar, cement of a grade not lower than M-300 is used, and its thickness should be 30-50 mm, while the layer of mortar above the heat pipes should not be more than 2 cm.

When installing a water heated floor system, one should take into account the technological limitation - finishing flooring must have a high thermal conductivity coefficient in order to transfer heat into the room air with minimal losses. That is, laying linoleum, laminate, parquet, or plank flooring over a warm floor is impractical due to the high heat-insulating properties of these materials. And laying over a tile system, especially with high density– porcelain stoneware, natural stone, a broom is not only justified, but also advisable due to the constantly cold surface of such a finish.

The laying method is used in rooms where the use of screed is undesirable due to low ceilings, or production concrete works is fraught with moisture leakage into the lower or adjacent rooms. The restriction may be a seasonal factor or due to design features building. The main advantage of decking systems is high speed their installation. Warm water floors of the laying type, based on the materials of the system, are divided into:

polystyrene;
wooden:

All these types of flooring systems are characterized by less labor intensity and the absence of significant contamination of the home during the installation process.

Polystyrene heated floors

This system is a set of heat-insulating coating made of extruded polystyrene foam (expanded polystyrene), heat pipes and heat-distributing aluminum plates.

Polystyrene slabs are laid on the load-bearing base, on top of which heat conductor pipes are mounted on aluminum plates with special grooves.

On top of the aluminum plates, the floor is finished with a material with a high thermal conductivity coefficient (for example, ceramic tiles with 2-component epoxy adhesive).

Wooden underfloor heating systems

These devices are mounted on existing wooden floors or wood joists.

The modular variety uses plates (modules) with channels and grooves for heat-distributing plates and pipes.

In the slatted subtype of heated floors, the installation of modules is carried out between existing ones on a hard surface. rough floor logs, or logs are pre-installed for this purpose. These structures play the role of stiffening ribs for the installed warm water floor and its subsequent finishing, the list of structural elements does not differ from the modular view.

After finishing the installation of heated floors, the system is also pressure tested and commissioning works (checking tightness, tightening connections).

The laying method of installing a heated floor system is universal and applicable in almost all buildings and structures. However, its advantages are reflected in the cost, which is quite high.

Conclusion

A competent project combined with qualified installation of equipment is a guarantee of a positive result. A water heated floor, which you will use as an additional home autonomous heating system, will be an effective, economical and practical device that significantly increases the comfort of your home.

znatoktepla.ru

Boiler for warm water floor: electric, gas or solid fuel

Today, water-based heated floors are a very popular type of residential heating. Such a home heating system has a lot of advantages: low energy consumption, the ability to control the temperature, etc. In order for a water-heated floor to work with maximum productivity, you need to choose the right floor heating boiler. The main criteria that should be followed when choosing a boiler are efficiency, ease of use, heating cost, as well as the degree of installation complexity and connection requirements.

Arrangement of the heating system

For such a heating system, you can choose a boiler that runs on any fuel. However, the unit must comply with one important condition: its control system must be automatic.

Boilers are classified according to the type of fuel they operate on: solid fuel (coal, firewood, pellets), gas (gas), electric (electricity), liquid fuel (diesel, waste oil).

The most profitable and productive for a warm hollow are:

electric boilers;
gas boilers.

Electric boiler for heated floors

An electric boiler is a device that heats the coolant using electricity. The operation of such units is characterized by productivity and efficiency. Efficiency can reach 99%.

Electric boiler operation diagram

But despite the high efficiency and productivity of electric boilers, their use involves high costs, since electricity is an expensive fuel.

An electric heating boiler is constructed of a tank containing coolant and heating elements. In addition, the unit is equipped with a safety group consisting of a pressure sensor and a safety valve. The boiler has a pump that circulates the coolant, an air vent and an expansion tank.

The principle of heating water for heated water floors is based on the following: water enters the boiler and begins to warm up. When achieved desired temperature, the coolant moves in the direction of the warm water floor.

The operating principle of floor-mounted and wall-mounted electric boilers is identical.

Advantages and disadvantages

Let us note the main advantages and disadvantages of using electric boilers for heated floors:

high efficiency;
reliability;
absence of combustion products;
work autonomy, human presence is not expected;
There are usually no difficulties with installation and further use.

A number of difficulties may arise when connecting the boiler to the network, since it will require separate electrical wiring.

Flaws:

energy dependence;
high price of electricity.

An electric unit for a warm water floor is more suitable for rooms that are not very large in size and with good thermal insulation, then their operation will be as economical as possible.

Installation and selection

Warm floors and an electric boiler are simply connected. The operating temperature for many models starts from 25°, so piping does not involve high costs. You will just need to acquire a collector, and then only in a situation where several circuits will be connected to one boiler. As already noted, there are no combustion products in the operation of such units, so you can install an electric boiler anywhere in your home.

When choosing an electric boiler for a warm water floor, you need to be guided by the following criteria:

power: the performance of the heating device (calculated according to the size of the heated room);
protection from air humidity;
degree of automation of boiler operation;
connection to a 220 V or 380 V network;
design;
manufacturer.

Connection diagram for boiler and warm water floor

Here are some manufacturers of electric boilers.

Gas boiler for heated floors

A gas boiler is a device that heats the coolant by burning gas. Since gas is an accessible and inexpensive fuel, a “warm water floor” heating system connected to a gas boiler is very profitable and efficient.

Can be installed in gas boilers open camera combustion or closed. In units with a closed combustion chamber, ventilation is forced, and this option has sufficient complex structure.

An example of a Protherm Panther KTV gas boiler

They also differ in the presence of a heat exchanger. If you intend to use the boiler to heat water, then you need to build a heat exchanger into it.

If the device is not equipped with a heat exchanger, then the water is heated by the same chamber as the coolant for floor heating. Let's consider the operating principle of such a unit:

Cold water moves through the rightmost lower pipe, where the safety group is also located.
Then the circulation pump is placed, in front of it is the expansion tank tube.
There is a temperature sensor on the tube.
The coolant then moves to heating element and enters the heating system of the warm water floor.

In the center of the boiler there is a gas fitting with its own safety unit, which controls the flame, gas pressure, and exhaust gases.

Advantages and disadvantages

A heating system, like a warm water floor from a gas boiler, has the following advantages:

cheap fuel;
high efficiency;
automated control system;
environmental friendliness.

For the normal functioning of a traditional gas boiler, the temperature must be at least 60°, while for a condensing gas boiler it should not be higher than 40°.

it is necessary to equip a system for removing combustion products outside the premises;
the equipment itself is expensive;
the boiler must be equipped with auxiliary elements: gas analyzers, gas pressure sensors;
fire hazard.

Installation and selection

Installation of a gas boiler for heated floors is quite simple:

A hydraulic valve must be installed between the supply and return pipelines.
If the circulation is carried out at a low speed, then the water will be stratified by temperature, and it will not be difficult to select the supply for the heated floor from the cold part, and the hot water, in turn, will flow into the boiler.
By installing a simple thermal control circuit, it will not be difficult to find out an arbitrary temperature of the coolant, practically unrelated to the return flow in the boiler.

If you decide to use a gas boiler for heated floors in your home, then when choosing such a unit, you should pay attention to the following indicators:

combustion chamber type: open\closed;
installation type: wall\floor;
power;
level of automation;
design;
manufacturer.

The leader among manufacturers of gas boilers for water floors is Viessman. The products of this company are characterized by strength, durability and high quality. Also positive reviews also has equipment from Buderus.

Solid fuel boiler for heated floors

Solid fuel boilers require constant attention and maintenance in their operation, and especially many difficulties arise in compatibility with heated floors. The exception is units running on pellets, but they still require more attention compared to boilers running on gas and electricity.

Solid fuel boiler design diagram

There are many difficulties in the operation of solid fuel heating devices:

A special place near the boiler is required to store fuel.
The boiler needs to be heated at least once a day.
It is necessary to carry out regular cleaning of the chimney.

To connect a solid fuel boiler, you need to install three-way valves. Their number should be equal to the number of contours. Thanks to the mixing unit that these valves form, the heated water will be cooled.

Solid fuel boiler with heat accumulator

When connecting a solid fuel boiler to a water floor, be sure to take into account that water enters the pipes under the action of a pump that is powered by the mains. If there is a power outage, the movement of the coolant will be stopped, but since the boiler will continue to function, the water will begin to heat up and its temperature will reach 100°C. Thus, due to the fact that units operating on solid fuel do not have automation, the water will overheat.

To avoid such unpleasant consequences, you can install a heat accumulator. This device is a container, the volume of which is calculated based on the power of the boiler - 40 liters per 1 kW. The thermal accumulator is connected to the underfloor heating system. The heated water will initially flow into this tank, and after it has cooled, it will flow into the pipes of the water-heated floor.

Boiler for warm water floor: selection features and connection diagram

5 (100%) votes: 2

In this article we will talk about a boiler for a warm water floor - gas, electric and solid fuel. We will look at their advantages and disadvantages, as well as how to choose and install (installation) correctly.

Today, water-based heated floors are a very popular type of residential heating. Such a home heating system has a lot of advantages: low energy consumption, the ability to control the temperature, etc. In order for a water-heated floor to work with maximum productivity, you need to choose the right boiler for it. The main criteria that should be followed when choosing a boiler are efficiency, ease of use, heating cost, as well as the degree of installation complexity and connection requirements.

You can find out the price and buy heating equipment and related products from us. Write, call and come to one of the stores in your city. Delivery throughout the Russian Federation and CIS countries.

Arrangement of the heating system

For such a heating system, you can choose a boiler that runs on any fuel. However, the unit must meet one important condition: its control system must be automatic.

Boilers are classified according to the type of fuel on which they operate: solid fuel (firewood), gas (gas), electric (electricity), liquid fuel (diesel, waste oil).

The most profitable and productive for a warm hollow are:

electric boilers;
gas boilers.

Electric boiler for heated floors

An electric boiler is a device that heats the coolant using electricity. The operation of such units is characterized by productivity and efficiency. Efficiency can reach 99%.

Electric boiler operation diagram

But despite the high efficiency and productivity of electric boilers, their use involves high costs, since electricity is an expensive fuel.

An electric heating boiler is constructed of a tank containing coolant and heating elements. In addition, the unit is equipped security team consisting of a pressure sensor and a safety valve. The boiler has a pump that circulates the coolant, an air vent and an expansion tank.

The principle of heating water for heated water floors is based on the following: water enters the boiler and begins to warm up. When the desired temperature is reached, the coolant moves towards the warm water floor.

The operating principle of floor-mounted and wall-mounted electric boilers is identical.

Advantages and disadvantages

Let us note the main advantages and disadvantages of using electric boilers for heated floors:

high efficiency;
reliability;
absence of combustion products;
work autonomy, human presence is not expected;
There are usually no difficulties with installation and further use.

A number of difficulties may arise when connecting the boiler to the network, since it will require separate electrical wiring.

Flaws:

energy dependence;
high price of electricity.

An electric unit for a warm water floor is more suitable for rooms that are not very large in size and with good thermal insulation, then their operation will be as economical as possible.

Installation and selection

Warm floors and an electric boiler are simply connected. The operating temperature for many models starts from 25°, so piping does not involve high costs. You will just need to acquire one, and then only in a situation where several circuits will be connected to one boiler. As already noted, there are no combustion products in the operation of such units, so you can install an electric boiler anywhere in your home.

When choosing an electric boiler for a warm water floor, you need to be guided by the following criteria:

power: the performance of the heating device (calculated according to the size of the heated room);
protection from air humidity;
degree of automation of boiler operation;
connection to a 220 V or 380 V network;
design;
manufacturer.

Connection diagram for boiler and warm water floor

Here are some manufacturers of electric boilers.

Gas boiler for heated floors

Can be installed in gas boilers. In units with a closed combustion chamber, ventilation is forced, and this option has a rather complex structure.

An example of a Protherm Panther KTV gas boiler

They also differ in the presence of a heat exchanger. If you intend to use the boiler to heat water, then you need to build a heat exchanger into it.

If the device is not equipped, then the water is heated by the same chamber as the coolant for floor heating. Let's consider the operating principle of such a unit:

Cold water moves along the rightmost lower pipe, where it is also located security group.
Then posted circulation pump, in front of it there is an expansion tank tube.
There is a temperature sensor on the tube.
Then the coolant moves to the heating element and enters the heating system of the warm water floor.

In the center of the boiler there is a gas fitting with its own safety unit, which controls the flame, gas pressure, and exhaust gases.

Advantages and disadvantages

A heating system, like a warm water floor from a gas boiler, has the following advantages:

cheap fuel;
high efficiency;
automated control system;
environmental friendliness.

For the normal functioning of a traditional gas boiler, the temperature must be at least 60°, while for a condensing gas boiler it should not be higher than 40°.

it is necessary to equip a system for removing combustion products outside the premises;
the equipment itself is expensive;
The boiler must be equipped with auxiliary elements: gas analyzers, gas pressure sensors;
fire hazard.

Installation and selection

Installation of a gas boiler for heated floors is quite simple:

It is necessary to install between the supply and return pipelines.
If the circulation is carried out at a low speed, then the water will be stratified by temperature, and it will not be difficult to select the supply for the heated floor from the cold part, and the hot water, in turn, will flow into the boiler.
By installing a simple thermal control circuit, it will not be difficult to find out an arbitrary temperature of the coolant, practically unrelated to the return flow in the boiler.

If you decide to use a gas boiler for heated floors in your home, then when choosing such a unit, you should pay attention to the following indicators:

combustion chamber type: open\closed;
installation type: wall\floor;
power;
design;
manufacturer.

The leader among manufacturers of gas boilers for water floors is Viessman. The products of this company are characterized by strength, durability and high quality. Buderus equipment also has positive reviews.

Solid fuel boiler for heated floors

Solid fuel boilers require constant attention and maintenance in their operation, and especially many difficulties arise in compatibility with heated floors. The exception is, but they still require more attention compared to boilers running on gas and electricity.

There are many difficulties in the operation of solid fuel heating devices:

A special place near the boiler is required to store fuel.
The boiler needs to be heated at least once a day.
It is necessary to carry out regular cleaning of the chimney.

Solid fuel boiler with heat accumulator

To avoid such unpleasant consequences, you can install. This device is a container, the volume of which is calculated based on the power of the boiler - 40 liters per 1 kW. The thermal accumulator is connected to the underfloor heating system. The heated water will initially flow into this tank, and after it has cooled down, it will flow into the pipes of the water-heated floor.