Gas boiler for heating and underfloor heating. Condensing gas boilers - operating principle, advantages and disadvantages. Requirements for installing a gas boiler

The underfloor heating system, which is based on heating using a pipeline and water as a coolant, is different high level efficiency and ease of installation of the entire heating system. The design of the water heated floor is closed, and, therefore, its operation does not require periodic additional intervention. Such a system can be made with your own hands both in private housing construction and in an apartment. In order to choose the right boiler model, ensure its rational operation and maximum efficiency level, you should take into account its power, calculation of the heated area, the presence of additional heating and heating devices, for example, a boiler or collector.

For installation of a water heated floor system in an apartment, there are automatic boilers various types, namely:

Gas (double-circuit and single-circuit);
Electric water heater;
Solid fuel;
Diesel.

There are also types of boilers depending on the method of their installation. So, floor option boilers are in many ways inferior to the wall-mounted type, since it takes up more usable area, but the connection diagram for these varieties is the same.

These devices can be installed either specifically for a heated water floor system, with their performance calculated for a given volume of coolant, or used for heating floors along with their main purpose - space heating.

A boiler of any configuration and operating principle can be suitable for a heated floor, and its automated operation is a prerequisite.

When installing heated floors in an apartment, a double-circuit gas or electric boiler is most often installed. Considering the cost of energy, it will be profitable to use a double-circuit gas unit, but to make a heated floor of this type, a special room and an air ventilation system are required. Also in this room there can be a collector, and placing a boiler will greatly save space. A double-circuit gas boiler can perform functions not only for heating air, but also for providing housing warm water. A double-circuit gas boiler for heated floors requires compliance with special conditions and installation rules. Installation of such equipment must be carried out by gas service employees after prior approval, so installation gas boiler with your own hands is illegitimate and contrary to current regulations.

The electric boiler is easy to use, and its installation can be done by yourself. Unlike other types of heating devices, electrical equipment is environmentally friendly, and the connection diagram does not require special knowledge or highly specialized skills. However, one of the main disadvantages that an electric boiler has is high costs on electricity consumption.

Solid fuel and diesel type boilers for water heated floors are more suitable for large country houses and cottages. The installation scheme of these systems is simple; the models are unpretentious in operation, but maintaining their operation requires constant monitoring. The solid fuel unit operates on briquettes or pellets, the loading of which must be ensured by the operator. The power of these devices, as well as the efficiency, is always high.

Whatever type of boiler is chosen for a particular room, before purchasing and installing it is necessary to correctly calculate its power, determine the location of connection to the water heated floor system, the need for a boiler, etc. Installation and connection of a special boiler can largely reduce pressure on the boiler.

Calculation of the required boiler power for water heated floors

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To effectively heat floors and achieve maximum efficiency when operating any type of boiler, it is necessary to correctly calculate the required power. The heating diagram and calculation must contain information about all potential sources of heat loss.

The calculation should be carried out taking into account the sum of all power indicators of floor heating systems and an additional margin from this number, which is approximately 15–20%.

The boiler power must cover the entire volume of the room being heated, taking into account the heat loss of the building. For a full calculation, it is necessary to involve a heat energy specialist, but the simplest one can be done independently. Average heat loss in a house is 100 W per 1 sq. m., provided there are no unheated rooms nearby and the ceiling height is not higher than 3 m. If the room is corner or has two or large quantity windows - average heat loss is 150 W.

As a rule, the efficiency of a water heated floor depends not only on the correctly selected boiler power, but also on the type of control mechanism installed. To do this, you need to choose the right high-quality and reliable collector, which has an outlet not only for the underfloor heating system, but also allows you to install a boiler (water heater). Calculating the boiler power requires accurate data on the volume of heated rooms and the location of furniture, decor or functional objects in them.

Installation of the boiler and connection of the water heated floor

The connection diagram for the gas boiler must be agreed upon with the relevant services. Wherein gas water heater The kit must include documentation regarding the test run. detailed instructions must contain everything technical features models, connection and operating conditions.

Installing a boiler requires preliminary arrangement of its permanent location. This area should be leveled using sand-cement mixture, and also, if possible, trim ceramic tiles or other durable and heat-resistant material. Since in most cases boilers are installed in specially designated areas, it is necessary to ensure extra seats for the location of such additional equipment, like a water heater and collector. The boiler should be provided with reliable thermal insulation; this can be done with your own hands, using foil types of insulating material. Since the water heater in operating condition has a large mass, its fastening to the wall must be reliable.

A solid fuel boiler requires a foundation; its mass is quite large and over time the unprepared surface may sag if the load calculation was incorrect. A double-circuit boiler, following the example of a boiler, can be installed on a wall using anchor connections. A solid fuel boiler is rightfully considered the most profitable and economical means of heating premises.

The branching and connection diagram for the water heated floor of each room should provide for a centralized location of the heating collector, which will not allow excess use of building materials.

The collector is usually installed in close proximity to the boiler. Installation must include reliable fastening to special strips, which allows you to insert pipes at the required angle and mount the circuits of the heating system and additional equipment, such as, for example, a water heater.

The power and efficiency of the heated floor from the boiler is regulated either using mechanical thermostats or using special automation. These devices can be selected depending on the expected temperature of the coolant in the heating system, as well as the power of the boiler. Thermostats are installed after the collector, taking into account mandatory free access to them.

A gas heating boiler is a device that uses fuel combustion (natural or liquefied gas) to heat the coolant.

Design (design) of a gas boiler: burner, heat exchanger, thermally insulated housing, hydraulic unit, as well as safety and control devices. Such gas boilers require a chimney connection to remove combustion products. The chimney can be either ordinary vertical or coaxial (“pipe in pipe”) for boilers with closed camera combustion. Many modern boilers are equipped with built-in pumps for forced circulation water.

The principle of operation of a gas boiler- the coolant, passing through the heat exchanger, heats up and then circulates through the heating system, releasing the resulting thermal energy through radiators, heated floors, heated towel rails, and also providing water heating in the boiler indirect heating(if it is connected to a gas boiler).

Heat exchanger - metal container, in which the coolant (water or antifreeze) is heated - can be made of steel, cast iron, copper, etc. The reliability and durability of a gas boiler depend primarily on the quality of the heat exchanger. Cast iron heat exchangers are resistant to corrosion and have a long service life, but are sensitive to sudden temperature changes and are heavy. Steel containers can suffer from rust, so their internal surfaces are protected with various anti-corrosion coatings to extend the “life” of the device. Steel heat exchangers are the most common in boiler production. Copper heat exchangers are not susceptible to corrosion, and due to their high heat transfer coefficient, low weight and dimensions, such heat exchangers are often used in wall-mounted boilers, but one of the minuses should be noted that they are more expensive than steel ones.
In addition to the heat exchanger, an important part of gas boilers is the burner, which can be various types: atmospheric or fan, single-stage or two-stage, with smooth modulation, double.

To control the gas boiler, automation is used with various settings and functions (for example, a weather-compensating control system), as well as devices for programming operation and remote control of the boiler.

Main technical characteristics gas heating boilers are: power, number of heating circuits, type of fuel., type of combustion chamber, type of burner, installation method, presence of a pump and expansion tank, automatic boiler control.

To determine required power gas heating boiler for private country house or an apartment, a simple formula is used - 1 kW of boiler power to heat 10 m 2 of a well-insulated room with a ceiling height of up to 3 m. If heating of a glazed basement is required winter garden, premises with non-standard ceilings and so on. The power of the gas boiler must be increased. It is also necessary to increase the power (about 20-50%) when providing a gas boiler and hot water supply (especially if it is necessary to heat the water in the pool).

Feature of power calculation for gas boilers: the nominal gas pressure at which the boiler operates at 100% of the power declared by the manufacturer, for most boilers is from 13 to 20 mbar, and the actual pressure in gas networks in Russia can be 10 mbar, and sometimes lower . Accordingly, a gas boiler often operates at only 2/3 of its capacity and this must be taken into account when calculating. For more details, see the table for calculating the power of a heating boiler.

Most gas boilers can be convert from natural gas to liquefied gas (cylindered propane). Many models switch to liquefied gas at the factory (when purchasing, check these characteristics of the model), or the gas boiler is additionally supplied with nozzles (nozzles) for switching to bottled gas.

Pros and cons of gas boilers:

Boiler piping- These are devices for the full operation of the heating and water supply system. It includes: pumps, expansion tanks, filters (if necessary), manifolds, check and safety valves, air valves, valves, etc. You will also need to purchase radiators, connecting pipes and valves, thermostats, boiler, etc. The issue of choosing a boiler is quite serious, so it is better to entrust the selection of equipment and its complete set to professionals.

Which boiler is the best? On Russian market gas boiler equipment has its own leaders in quality and reliability. The best manufacturing companies and brands of gas boilers are presented in an assortment:

"Premium class" or "Lux"- the most reliable and durable, easy to use, the kit is assembled like a “construction set”, more expensive than others. Such manufacturers include German companies

For creating comfortable conditions Increasingly, owners of mansions and apartments are striving 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, which are one of the critical devices in a water-heated floor system must meet a number of requirements, the fulfillment of which guarantees a long period of trouble-free 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, and affordable price are also attractive.

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.

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 with electronic controls that regulate 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. A few hours of work will provide car batteries. 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. When thermal energy is transferred, the gases are cooled, and when certain temperature Condensation forms, causing additional heat. This feature significantly increases the efficiency of heating equipment.

Gas boilers function flawlessly under conditions of uninterrupted gas supply, without requiring special techniques for routine maintenance. In designs where an electronic mechanism is provided for igniting the boiler, the operation of the burner is regulated in accordance with the specified temperature indicators 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

To spend correct connection For water heated floors, you should choose an autonomous room for the boiler. Arrangement of such a system in standard apartment will require qualified advice.

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 shut-off valve allowing 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 on inlet pipe The circulation pump is securely fixed.
A mixing valve (preferably a three-way valve) is connected to warm pipe 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 the 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. After doing a test run 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. Can be adjusted three-way valve to the required 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 safety valve, triggered 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

When installing a water heated floor, it is important not only to correctly calculate and lay the pipes, but also to choose the right boiler. After all, the well-being and quality of life of the inhabitants of the house/apartment will depend on how well it copes with its functions.

The choice of a boiler for a heated floor must be carried out according to several parameters:

ease of use;
heating cost;
degree of adaptation to low temperature conditions and necessary additional equipment.

Based on the totality of these parameters, as well as whether you will have primary heating or additional heating, which type of fuel is preferable for you, you need to choose a heating unit.

Choosing a boiler for a warm water floor is not an easy task

Degree of autonomy

Comfort requirements heating equipment- these are not the whims of spoiled consumers: not everyone has the opportunity to constantly monitor the operation of the heating system and add fuel. That’s why we consider this parameter first.

The highest degree of autonomy in . There is electricity - they work without human intervention. Moreover, after a power failure, they start working independently; many of them have “memory” and save settings. But there are three types of electric colas:

on heating elements;
electrode;
induction

An electric boiler for underfloor heating with heating elements is a traditional solution. They just have one “disease” - heaters burn, and quite often. But their cost is average, and the technologies have been tested and proven; even a person who is not very good at communicating with technology can replace a burnt-out heating element. In general, a good (but not the best) option.

The most “independent” are solid fuel installations. You need to add fuel to them often, regularly remove ash and slag, and regulate the intensity of combustion. Of course I have, . The most best models One bed of coal can work for several days (up to 7 days for some models of the company). But there are also difficulties here: they are demanding on fuel (you need dry firewood or coal of a certain standard), and the price can also be a deterrent.

A solid fuel boiler for water heated floors requires constant human presence. Pyrolysis units and long-term combustion units require “refueling” two to three times less often

You can use a regular solid fuel boiler for a water heated floor, but you will have to spend a lot of time near the stove. Although there are already solid fuel units with automated supply. They are equipped with pellet-type bunkers and a screw feed. Only the requirements for the size and quality of fuel in them are no less stringent than those that run on pellets. But you can leave your home for a few days and not be afraid that the system will expand.

Fifth place for liquid fuel - it's not cheap. Operating costs also include the need to heat the fuel tank, or install the tank in a heated room. In addition, installations using diesel fuel require a boiler room. Moreover, it is better to build a boiler room at a decent distance from the house: the noise during operation of the burner is decent, and the smell is strong, and it penetrates everywhere.

It is generally accepted that the most expensive heating is electricity. But when using automated modern devices you have to pay only a little more than when using coal or firewood. So electric boilers for a warm floor, don’t discount it. Just for more economical heating It is advisable for you to take a heating unit with the ability to adjust power. In some traditional electric boilers, heating elements are assembled in groups, and automation, turning the groups on/off, regulates the operating power and saves energy. For heated floors, it is advisable to take a three-stage, or, in extreme cases, a two-stage unit. Induction and electrode boilers themselves are economical (if controlled electronically) and have low inertia, that is, they do not waste energy.

Adaptability to working with heated floors

Most boilers are designed for traditional heating systems, that is, they produce coolant with a temperature of 60-95 o C. The peculiarity of water floor heating is that much more is required low temperatures: about 35-50 o C. Only under such conditions the floor will not burn, but will be pleasantly warm.

There are two solutions: find a unit that can produce warm, not hot water, or add cold to the hot one, and only then release it into the pipes. The second solution requires additional equipment - a collector unit, in which mixing occurs. This is not the most cheap technology, since it is necessary to measure the temperature of hot water and return water, mix them until the temperature drops to the required level. Of course, collector units are different, more or less expensive, but they still need to be purchased and installed.

Let's start with boilers for water floors, which can themselves produce coolant at the required temperature. Here in the first place are electric thermal units. You can set the temperature yourself from 25 o C and above. That is, no additional costs and comfortable work with warm floors. In addition, induction and electrode (ion) boilers have very small dimensions, which makes them easier to install. If you have only one circuit, you can connect it directly to the output. If there are several circuits, a heated floor comb will be needed, but the simplest one, without mixing and temperature controllers. In principle, you can make it yourself from pipes and fittings. Other equipment may be needed (or not, depending on the configuration) expansion tank, drain valve and circulation pump.

There is another option that simply shows excellent efficiency when working with low-temperature networks - this is. They are most effective at a coolant temperature of return pipeline no higher than 35 o C. That is, this is an excellent option for a water floor.

The best choice is a condensing gas boiler for heated floors

Gas boilers using traditional technology heat extraction, require the installation of a mixing unit with control elements. If you decide to use such equipment, try to choose a model that can work with two or more circuits simultaneously. Usually one of them is high-temperature for radiators, and the rest are for low-temperature systems such as underfloor heating. In this case, monitoring the temperature and mixing the coolant is done automatically and everything happens inside the installation. So if your water heated floor works simultaneously with radiator heating, such equipment is an excellent solution.

The situation is more complicated with boilers using pellets and liquid fuel: for them, a collector (mixing) unit is required. And with all the stuffing: thermometers, controllers and thermal heads.

Wiring high-temperature boilers for heated floors is not the easiest task

But the hardest thing to adapt for heated floors is probably solid fuel boilers: their operating principle is cyclical. Either they dispense very hot water, or they die out completely. Not the best comfortable option, requiring high-quality automation and temperature control in each circuit. A heat accumulator will help reduce these fluctuations, but it also costs a lot of money and takes up a lot of space. In addition, the piping becomes more complicated and the inertia of the system increases several times: it will take a lot of time until the entire coolant warms up. True, inertia acts in the opposite direction: while the coolant cools down, the house is warm, and this is great freedom, since there is no need to regularly add fuel. And yet, despite the popularity of wood and coal, a solid fuel boiler for a water heated floor is not the best solution.

Results

So, what should you choose? Most best option— gas boiler for underfloor heating with condensation technology for heat extraction. In all three respects, it occupies good positions. The situation is a little worse if you put gas installation with “warm floor” function. But, unfortunately, not everyone has the opportunity to connect to main gas. And then the easiest way to implement a water heated floor with an electric boiler. A small electric boiler can be installed to heat heated floors in utility rooms, for example, in a garage or in a country house: it is very easy to install. The next “quality” unit is a pellet unit, followed by liquid fuel. The most difficult task and high costs await when using solid fuel boilers for water floor heating.

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 is a coil located under the floor screed and connected to closed loop led by a 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 coolant with high temperature, 40-45°C is enough. 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 due to 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;
ease of 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 ensure uninterrupted and efficient heating premises in automatic mode. Therefore, the choice of unit is based on several basic characteristics:

The thermal power of the unit should be enough for the area of the room.
Level of automation of the boiler operation (possibility of programming 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. Heating system gas 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;
Less gas is released when burned harmful substances 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 heated floors 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 analogues, 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 electric will do boiler or gas condensing boiler. If it is not possible to install a chimney, you should opt for the electric option.