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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. Thus, the floor-standing version of boilers is in many ways inferior wall type, since it takes up more usable space, 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 the functions of not only heating the air, but also providing the home with warm water. A double-circuit gas boiler for heated floors requires compliance special conditions and installation rules. Installation of such equipment must be carried out by gas service employees after prior approval, therefore installing a gas boiler with your own hands is illegitimate and contrary to current standards.

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

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., in case of absence nearby unheated premises and the ceiling height is not higher than 3 m. If the room is corner or has two or more windows, the 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 installation adjusting mechanism. 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. In this case, the gas water heater included in the kit must have documentation regarding the test run. detailed instructions must contain all the technical features of the model, connection and operating conditions.

Installing a boiler requires preliminary arrangement of its permanent location. This area should be leveled using a sand-cement mixture, and, if possible, finished with 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 additional equipment such as a water heater and manifold. 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 should include reliable fastening to special strips, which allows you to insert the 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 a closed combustion chamber. 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 by heating water in the boiler indirect heating(if it is connected to a gas boiler).

A heat exchanger is a 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 corrosion resistant and have a long service life, but are sensitive to sudden change temperatures and differ in significant weight. 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 the downside is 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 a gas boiler, automation is used with various settings and functions (for example, a weather-dependent control system), as well as devices for programming operation and remote control of the boiler.

The main technical characteristics of gas heating boilers are: power, number of heating circuits, fuel type, 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 a basement, glassed-in winter garden, rooms with non-standard ceilings, etc. is required. 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 manufacturers and brands of gas boilers are presented in the 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

A comfortable environment in the home is not only Beautiful design premises and cozy furniture. It's also warm. And it is the warm floor that will help ensure complete heating of the premises, especially in a private house. However, it is not always possible to install electric heating, and people often opt for a water heating system. At the same time, if there is no option to connect it to a centralized heating system, it is necessary to install an electric boiler for heated floors. All that remains is to decide which model to choose and how to install it.

Features of underfloor heating without radiators, boilers for underfloor heating

People often think about underfloor heating specifically in the winter, when you really want to move around the premises barefoot, but the flooring is so cold that this is not possible. An option to make it more pleasant and tactilely comfortable is to install a heated floor system.

There are different floor heating systems - water, electric, infrared. And often owners of apartments and houses make a choice in favor of the first option. The system will consist of main pipes through which the coolant - hot water - circulates, as well as a boiler that heats this water.

On a note! In new buildings, floor heating can often be connected to the central heating system - it will have special outlets for connecting the heating system pipes. But in private houses, as well as older apartments, connecting to heating is impossible, so there are two options - using other heating systems or installing a water heating boiler.

The boiler is often used to heat rooms for various purposes– apartments and garages, houses and offices. This reliable device has acceptable dimensions and is not dangerous for use in a residential area. It also has very convenient system temperature control, which will allow you to control the microclimate in the room. This will make it possible to leave the unit turned on unattended for a long period of time.

On a note! The boiler belongs to an autonomous heating system; it will save a lot of money that would be spent on regular additional heating of the room.

However, experts do not recommend using only a heated floor system without heating radiators for heating a room. The fact is that in order to warm the house to comfortable temperature, you will have to heat the floors to at least +30 degrees, and this can negatively affect the floor covering, and it will also be unpleasant for a person to move on such floors when it is hot. Also, thanks to radiators, the air in the room can be warmed up much faster than with a heated floor system. The latter even take longer to warm up due to the fact that they are covered with a screed, which also needs to be warmed up.

On a note! Work efficiently and economically low power Only electric boilers can. Everyone else will burn too much fuel to keep the temperature low, which is not profitable.

An electric boiler brings comfort to your home

That is why the underfloor heating system should heat only the surface of the floor, the rest of the room should be heated by radiators. And, nevertheless, for the correct and economical operation of the equipment, it is worth purchasing a heating boiler.

Types of boilers for water floor heating

There are several types of boilers for heating the coolant, that is, water. They differ in the features of operation, installation and operation, as well as the type of fuel on which they operate.

Table. Types of heating boilers.

Boilers can also be divided into two categories based on their installation location. They are wall-mounted and floor-mounted. Floor-standing ones, as a rule, have more power than suspended ones. But the latter are much more convenient to install and less expensive to maintain.

Diesel boilers

In this case, the fuel is ordinary diesel fuel. These units are productive and very efficient, they are completely autonomous, that is, they do not depend on whether they are connected to any communications (gas, electric networks, etc.). They are easy to install, easy to operate and have high efficiency rates with low fuel consumption.

diesel heating boilers

Solid fuel boilers

The fuel for these units is firewood and fuel pellets. The operating principle is similar to burning wood in a conventional stove. But in this case, combustion occurs at high temperatures (from +250 degrees) and without air access. Heating of the coolant occurs due to the release of hot smoke during fuel combustion.

Such boilers are rarely used in residential premises; their usual area of ​​use is production, Agriculture. These units in the house require constant attention, as well as fuel loading, which complicates operation.

On a note! If the boiler has a chamber where fuel burns, closed type, then it can be installed anywhere. For equipment with camera open type it is necessary to look for a separate room in the house for installation.

solid fuel heating boilers

Gas boilers

It is not difficult to guess that this type of boiler runs on gas. The body of these devices is usually made of cast iron or steel, which will determine the service life and ease of installation. Steel boilers are much lighter than cast iron, they are small in size and easy to repair. However, their service life is shorter. That is why cast iron units are more expensive, as they have increased reliability indicators. The devices can operate on both main gas and liquefied gas from cylinders. They are quite economical, and for heating only floors you can use a low-power unit.

These boilers are not recommended for connection to a heated floor system. The reason is simple - they, of course, are able to maintain the water temperature at low levels (about +45 degrees), but in fact they are designed to heat the coolant at least +80 degrees. Because of this, the efficiency of the boiler will drop greatly (up to 15%).

But there is still the option of using a gas boiler to work with a heated floor system. To do this, you will have to use a mixing unit equipped with a special distributor and circulation pump. However, this will also increase the costs of purchasing equipment and its installation.

On a note! By the way, the same applies to other types of boilers, with the exception of electric units.

Electric boilers

These units, operating on electric current, can be used in any area and are best suited for connection to a floor heating system. Connecting this boiler is simple, despite its apparent complexity. Such units will allow you to organize low-temperature heating - the kind that is needed for heated floors - due to the ability to adjust the temperature of the outgoing coolant flow.

On a note! The higher the thermal insulation in the room, the less power you will have to purchase a boiler.

In the photo - an electric heating boiler

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

You need to calculate the power in order to choose a unit that is suitable for heating floors. This indicator depends on many factors, but it is quite simple to approximately calculate it, based on the fact that to heat 10 m2 of area of ​​a brick and well-insulated house with a ceiling height of up to 3 m, only 1 kW of unit power is required. Thus, the specific power will be equal to 100 W/m2.

On average, the coolant temperature should be about +70 degrees, in this case you need to increase the boiler power by about 20%. Also, an increase in this indicator should be carried out with any additional load on the unit. That is, if it is also used storage boiler, then about 30% more power should be added. If the floor heating system acts as an addition to radiator heating, then its heat transfer will be no more than 50 W/m2.

Advice! If in the future the area of ​​heated premises will be increased, then the boiler must be installed with such a power that it will allow heating the outbuildings as well.

electric heating boilers

Boiler selection criteria

Unfortunately, there are no specially designed boilers to which a heated floor system can be connected. There are, of course, models in technical passports which are indicated that they can operate in this mode, but in general this is only one of the functions of the equipment.

The choice of floor heating equipment should be made according to several criteria:

• the ability to adjust the heating of the coolant and floors;
• unit power;
• Type of fuel;
• compatible with floor heating system;
• high efficiency;
• ease of use, repair, maintenance;
• safety system;
• manufacturer;
• ease of installation.

Everyone should choose the fuel that will be most profitable. In some regions it is cheaper to heat with electricity, in others - with gas.

One of the most important parameters The choice of a heating boiler is the possibility of connecting it to a floor heating system. This is necessary in order to be able to set the temperature of the coolant that will circulate without damage to the equipment and budget. On the supply side, the heating system should produce only +35-45 degrees, and on the return side – about +25.

On a note! If the house is heated by radiators connected to a boiler, from which the heated floor heating system also extends, then choosing a unit will be easier. If the heating of the premises will not be carried out by the boiler, then it is important to choose a model that will allow you to set a low floor heating temperature.

It is also important to evaluate the area of ​​the room in which the heated floor system will be installed, the materials from which it is made finishing, as well as screed parameters.

What boilers can be combined with heated floors?

Most the best option Boiler for heating floors is an electric boiler. Moreover, regardless of whether it is a heating element, induction or electrode. It has optimal efficiency even when operating at low power. IN small house Such equipment can be connected directly to the floor heating system. In large rooms it is better to make the connection using a special distribution and mixing unit.

The boiler operates automatically and requires virtually no human control. It is easy to install and easy to maintain.

You can also use condensing gas boilers, which can operate efficiently with a slight heating of the coolant. But conventional gas units require the installation of a mixing unit, which will have control elements. This is a great option for combining radiator heating and underfloor heating systems.

Solid fuel and liquid fuel boilers are not the best option, although they can also be used to organize a floor heating system. They require the installation of a mixing unit with thermometers, controllers, etc. additional equipment. Yes, and it is very difficult to adjust the desired temperature with their help - sometimes they produce too hot a coolant, sometimes too cold.

Advice! To cope with this, you should purchase and install a heat accumulator. But this device is not cheap.

Which brand is the best

An important factor when choosing a boiler will be the brand under which the equipment is manufactured. Manufacturers who supply heating boilers on the market, there are quite a few. Let's get acquainted with the main and most popular of them, as well as the brands of boilers and their costs. The emphasis will be on electric boilers, since they are the best option.

Table. Boiler manufacturers, equipment characteristics and cost.

The most popular are units from Ferroli (Italy), Viessmann (Germany), RusNIT (Russia), Dakon (Czech Republic). The cheapest are, of course, boilers Russian production. Imported units are usually at least 20% more expensive than domestic ones.

Instructions for connecting the boiler to a heated floor

Step 1. According to the rules for installing a heated floor system, the rough covering is covered with a layer of thermal insulation, waterproofing, reinforcing mesh, to which the coolant pipes are screwed according to the diagram.

Step 2. An electric boiler is installed in its designated place.

Step 3. All pipes for the coolant are supplied to the boiler.

Step 4. All pipes for the coolant and the boiler are installed and connected to it.

After this, the tightness of the system is checked by pouring coolant, and then the heated floors are poured cement mixture(in this case, the coolant must be inside the pipes). After the screed has dried, the heating system can be used.

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Heating system frame house has two main requirements: efficiency and economy.

To these we can add one more, no less important requirement - safety, especially from fire positions. If all of them are fulfilled, then the heating issue can be considered resolved with the most successful results.

And, nevertheless, one more goal can be named, a maximum program: heating autonomy, independence from networks or suppliers. To some extent, this situation can be achieved by using heating systems operating on a coolant -. From the point of view of economy and efficiency, heated floors leave radiator systems far behind, which makes it possible to distinguish it as the most attractive type of heating for a frame house.

However, you can simultaneously heat your home with heated floors and radiators.

- this is a dense (10-30 cm between adjacent pipes) mesh or, more precisely, a spiral-shaped system of thin (15-20 mm) pipes located in the thickness of the concrete screed or without it under floor covering. The coolant circulating through them transfers heat to the floor surface, which, in turn, radiates it into inner space rooms.

Density and big square placement (or contours) of a warm floor allows you to do without reaching high coolant temperatures - 45-50 degrees is enough. The uniformity of pipe laying makes the heating dense, there are no colder areas. The warm floor is comfortable for contact and pleasant to walk on barefoot.

This convenience results in the need for precise temperature control, since the radiation power is such that an increase or decrease of several degrees is perceived as a significant change in the operating mode of the system.

The temperature of the coolant in the supply line is much higher than required. If you put such a hot coolant directly into the circuits, the room will become hot like a sauna. To prevent this from happening, the hot coolant is diluted with coolant that has cooled down, passed through the circuits and given off its energy - the return.

This dilution is done in a mixing unit, which limits the flow of hot water from the direct pipeline and simultaneously mixes it with the return one. By adjusting the amount of hot and cooled water, the desired temperature of the heated floor is achieved.

If the system is powered from its own boiler, then the dependence on networks (and their tariffs) is removed. Opportunity self-study coolant is a very valuable circumstance that provides independent external factors functioning of the system. For a frame house, such independence can result in considerable savings, since the ability to connect is not always available, and it is very expensive.

Types by fuel type

Heating boilers are a fairly large group of devices that have different principle actions. According to the type of fuel (energy source), boilers are divided into:

1. Gas. The most efficient and economical boilers. The cost of 1 kW of energy is the lowest, and the efficiency is the highest.
2. . Water is heated using heating elements, electrodes or induction. The easiest to maintain and most expensive source of heating fluid.
3. Solid fuel. Boilers that use almost everything that burns as fuel - wood, coal, briquettes, pallets, etc. The availability of fuel makes such a boiler most suitable for autonomous heating of a house, but the combustion chamber has to be constantly filled. Modern models, however, are capable of long burning without human intervention.
4. Diesel. The source of thermal energy is burning diesel fuel. A diesel fuel boiler can operate independently for a long time - up to several months. This type of boiler may turn out to be more profitable than even a gas one, if it is not connected to the mains, but uses imported gas.
5. Combined. Boilers that have the ability to switch to another type of fuel if necessary. The design of such a boiler can have two fireboxes, or one universal one for different types fuel, you just need to replace the burner. At the same time, there are universal boilers with the option of converting wood to electricity when a second firebox is not needed. The ability to have an alternative heating option is a valuable quality for a country house when fuel shortages are possible.

general information

A gas boiler is a device for heating water (coolant) using the combustion energy of natural gas or propane.

There are no specialized devices for heated floors, but there are boiler models with the “warm floor” function, when turned on, the usual power limitation occurs, which is irrational.

Connection to gas main or imported gas in cylinders, which significantly increases costs. Externally, a gas boiler looks like a small cabinet or wall cabinet, it usually has an attractive modern design (at least the new models do). Thus, powering the heated floor in the house from the boiler is very convenient and efficient.

Why is it needed?

The operation of a heated floor is based on the use of coolant energy. If there is no heating floor, you have to supply it from your own boiler. Heating of the coolant during autonomous operation of the underfloor heating system can only be carried out in this way. Since gas is the most economical fuel, the cost of 1 kW of energy obtained from burning gas is several times cheaper than heating with electricity, then powering a water heated floor from your own gas boiler becomes the most preferred method.

Application

The best option to use a boiler for underfloor heating is the ability to connect to gas supply networks. In this case, fuel supplies are made constantly, the operation of the boiler becomes rhythmic and uninterrupted. At the same time, the water heated floor from the gas boiler works efficiently and effectively. All other options involve the delivery of gas in cylinders, which threatens interruptions and increases costs.

Safety requirements

Safety requirements for operation gas equipment almost the same for all types of boilers.

Basic provisions:

• a separate room is required to accommodate the gas boiler;
• The boiler room must be equipped with a gas analyzer so that in case of gas accumulation (for example, spontaneous extinguishing of the burner) it can be notified in time;
• there should be no foreign objects in the boiler room, especially flammable ones - paint, solvent, chemicals, etc.;
• the boiler must be free for air flow, it is prohibited to lean or lean anything against it;
• If you detect a smell of gas, immediately shut off the supply and notify gas service and ventilate the room. When using propane-butane, ventilation may be useless, since it is heavier than air and accumulates at the bottom;
• Do-it-yourself repair of boiler safety sensors is prohibited.

The requirements are simple, but they must be strictly observed to avoid dangerous consequences.

Classification of gas boilers

There are many developments of gas boilers. They are conventionally divided into groups according to various characteristics.

According to the installation method, boilers are divided into:

1. Floor. They are installed on the floor, do not create a load on the walls (which is very important for frame houses), have fairly large dimensions and are used for heating large houses.
2. Wall mounted. They are hung on walls, which will require adequate strength, taking into account the weight of the boiler. Serve for heating systems small houses(up to 200 sq. m., some sources indicate higher values ​​- up to 350 sq. m.).

By number of circuits:

1. Single-circuit. They are used only to service one heating line.
2. Dual-circuit. Works simultaneously as a power source for heating system and for heating hot water for domestic needs. In this case, the device usually cannot operate simultaneously in both modes; when the DHW is heated, the heating turns off.

According to heat exchanger material:

1. Steel. The simplest and relatively cheap material. It has fairly average indicators in terms of service life, since temperature fatigue of the metal quickly sets in and cracks appear. In addition, the material is susceptible to corrosion, although manufacturers are making attempts to neutralize its effect by applying various coatings.
2. Stainless steel. Quite an expensive option, less commonly found on sale. It has good performance and combines all the best properties of cast iron and steel devices.
3. Cast iron. High corrosion resistance, strength and durability are the defining qualities of the device. However, it is necessary to carefully monitor the uniformity of heating, otherwise the material with different temperatures in neighboring areas may crack. In addition, the disadvantage is the usual fragility of cast iron.
4. Copper. This option is mainly implemented in wall-mounted boilers. Corrosion resistance, light weight, low inertia of the boiler, which makes it possible to quickly and flexibly regulate the operating mode.

By type of combustion chamber (furnace):

1. Open. Combustion occurs using air supplied from outside through special channels - natural traction. A device with this type of firebox requires free access of air and separate room. The cost of such a boiler is much lower than that of samples with a closed firebox.
2. Closed (turbocharged boiler). More expensive and convenient types of boilers. They can be used without being placed in a separate room, which is important for frame houses where the area is not so large.

To remove smoke, a vertical chimney is used, although a horizontal method is also possible using a fan, which at the same time supplies Fresh air necessary for combustion.

Attention! Forced air flow for more intense combustion - turbocharging - is one of the functions of all new models of gas boilers.

Specifications

Familiarization with the technical characteristics of a gas boiler allows you to quickly and fairly fully learn all its properties and capabilities.

Key indicators reflected in technical specifications devices:

• boiler power;
• type of combustion chamber (open or closed);
• number of circuits (one or two);
• heating area (maximum, usually the upper limit of distribution is indicated);
• volume of fuel (gas) used;
• water consumption, ability to heat it. (2.5-17 l/min on average, there are also more productive models);
• Device efficiency (usually within 80-90%).

Attention! Boilers from different manufacturers may be provided with a different list of characteristics, which is often a marketing ploy. Thus, an efficiency of 109% is nonsense from a physical point of view, and yet this figure can often be seen in product data sheets.

Choice

First of all, you should choose a water heater for underfloor heating of suitable power. Calculating the power of a boiler is a difficult task; the easiest way is to proceed from the average value - 1 kW of power per 10 sq. m. area.

It is necessary to pay attention to the possibility of adjusting the boiler operating mode. It is best if there is the possibility of smooth adjustment.

It is also necessary to decide on the required number of circuits, type of installation and other characteristics of the boiler, which will best meet the requirements of the existing premises.

Principle of operation

The gas boiler closes the coolant circulation loop in the system, powering the heated floor from the heating boiler, being both a source of direct hot flow and a receiver of cooled return flow. The heated coolant leaves the boiler and is sent to replenish the heating system. As it follows the contour of the heated floor, its temperature drops, releasing thermal energy to the floor surface.

After this, part of the return flow is returned for reheating, and the other part is mixed with the fresh hot flow to form a mixture with set temperature. Thus, the gas boiler constantly heats, releases and receives coolant circulating through the system.

Water heating

The return flow entering the heat exchanger is heated by the burner flame; upon reaching the desired temperature, it is directed to the underfloor heating system using its own heat exchanger. Thus, cycle after cycle, there is constant heating and release of the coolant, as well as the reception of cooled return flow, which is supplied for heating.

Device

Single- and double-circuit boilers have some differences in design.

A single-circuit boiler only works to heat the coolant in the underfloor heating system, for which the incoming return flow passes into a heat exchanger, which heats it from the burner flame.

The hot coolant is discharged into the supply line and flows into the floor heating circuit system.

The double-circuit boiler has a simultaneous connection to the underfloor heating system and to the water supply system. In coolant heating mode, it operates as described above. When switching, the flow of heating fluid is temporarily stopped, and hot water is prepared in the heat exchanger. At this time, there is a short break in the replenishment of the heated floor, which is not so noticeable due to the inertia of the system, and if the heated floor structure contains a concrete screed, this does not affect the floor temperature in any way.

Connection diagram

The most simple circuit Connecting a heated floor to a boiler means connecting the supply and return lines from to the corresponding boiler terminals. This option is used in simple single-circuit boilers. It is for this reason that the question of how to connect a heated floor to a boiler is not so pressing. The main task is not to confuse the conclusions, which, in fact, is excluded.

To connect a double-circuit boiler, in addition to connecting the supply and return coolant, you will need to connect the forward and reverse flows from the water supply system. In addition, it is necessary to connect the gas supply pipe, smoke removal system and air supply (turbochargement). All pipelines must have Ball Valves so that at the right time it is possible to block any flow that is required.

Installation

In itself, connecting the heated floor to the boiler does not cause any particular difficulties and can be easily done with your own hands.

Procedure:

Preparatory work:

1. Boiler installation. The device is completely installed - on the floor in the right place or mounted on the wall - depending on the type of structure.
2. (pouring a concrete screed is excluded until the functionality is fully checked or before the circuits are pressurized with compressed air).
3. Connecting underfloor heating circuits to the pump-collector unit.

Connecting the boiler to the underfloor heating system:

1. The main pipelines are connected to the corresponding outlets and the boiler. For connection, a metal-plastic, copper or polyethylene pipe with appropriate fittings suitable for the connectors of the boiler and mixing unit is used. Gas supply to the boiler is carried out using a corrugated stainless pipe.
2. Checking the connection(visual, trial run, ).

Attention! It is imperative to ensure the possibility of shutting off each pipeline in an emergency to prevent unwanted incidents.

Advantages and disadvantages

pros:

• efficiency;
• efficiency;
• reliability;
• high quality work, possibility of self-installation.

Minuses:

• the need for coordination with Gosgortekhnadzor;
• possibility of gas leakage;
• the need to comply with the boiler installation conditions (separate equipped room);
• The gas supply is shut off automatically if there is poor ventilation or a leak.

The last disadvantage is also an advantage - the possibility of an accident is eliminated.

Useful video

Visually see an example of connecting a gas boiler to a water boiler warm floor in the video below:

conclusions

Using a gas boiler to power water heated floors in frame house provides an effective and economical way to prepare coolant. The costs in this case are the lowest compared to any other type of boiler; in addition, the operation of the heated floor is seasonal, which provides additional features to save money.

The ability to start the system at any time at will, relative heating autonomy, preparation of coolant with simultaneous heating of hot water are important advantages of gas boilers that provide the comfort and coziness of a frame house.

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