Providing heat to the entire house with one small device: how to choose a wall-mounted gas boiler?

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A wall-mounted gas boiler is a heating unit that acts as a the central element of the liquid heating system.

The technical characteristics of these devices allow them to be used both for heating apartments in multi-apartment buildings and for providing heat in private cottages.

Content

Types of wall-mounted gas boilers
Appearance and features
Device
Advantages and disadvantages
Requirements for the premises and the choice of the boiler
Useful video
Optimal choice
Comments (4 opinions)

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Types of wall-mounted gas boilers

Model range similar units quite wide, the following types of structures are distinguished:

Photo 1. A single-circuit wall-mounted gas boiler is mounted on tiles in a spacious bathroom.

convection (classical);
condensation;
single-circuit;
double-circuit.

Important! Double-circuit wall-mounted boilers, in addition to heating rooms, provide hot water supply or operation "warm floor" systems.

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Appearance and features

The wall-mounted gas boiler is a comparatively compact unit, which, as the name suggests, is attached to the wall.

In addition to the installation method and compact dimensions, wall-mounted boilers differ from floor-standing models in the following indicator: maximum power, not exceeding 40 kW.

At the same time, this characteristic allows for the efficient operation of the heating system for areas up to 200 m².

For heating large spaces, they are usually used floor standing gas boilers.

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Device

The appearance and design of the unit depends on characteristics of a specific model, while all wall-mounted devices have a similar design (except for the size and mounting method) to their floor-mounted counterparts. Basic elements wall-mounted boilers are the same.

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Combustion chamber

The air-gas mixture is fed into the combustion chamber and ignited. This releases energy that is used to heat the coolant. Modern models of wall-mounted boilers equipped with modulating burners, allowing you to regulate the flame strength and, accordingly, maintain the temperature at a given level.

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Heat exchanger

The element of the device design responsible for the distribution of the generated thermal energy, i.e. directly for heating the coolant. For their production, copper or stainless steel.

Heat exchangers made of copper have better thermal conductivity and efficiency, while stainless steel products are stronger and less susceptible to corrosion.

Photo 2. The copper heat exchanger of the wall-mounted gas boiler has good efficiency and thermal conductivity.

Condensing models are equipped with two heat exchangers.: the primary one uses the energy obtained from burning gas to heat the coolant, the secondary one is responsible for transferring the heat released during condensation of combustion products.

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Circulation pump and expansion tank

The pump is responsible for the circulation of the coolant in the heating circuit. The number of installed circulation pumps varies - more powerful boiler models often equipped with an additional pump.

The expansion tank is a sealed container that receives excess liquid resulting from thermal expansion of the coolant. This element allows stabilize the pressure in the heating circuit.

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Automation and protection means

All wall-mounted boilers are more or less automated, which allows maintaining a stable temperature in the heated rooms and ensure the safety of the heating system generally.

Automation means for wall units are complex of electronic devices, reacting to changes in various indicators of the heating system (as well as its individual elements) and controlling the operation of the device in accordance with the specified settings.

All certified models are equipped with protection system, which automatically stops operation when the power goes out or in other potentially dangerous situations. In addition, the boilers are equipped with measuring and control devices that allow manual control.

Important! According to statistics, built-in automation tools (in particular, the self-diagnostic system) detect up to 90% cases malfunctions wall-mounted boilers. If any malfunctions are detected, all information about the nature of the deviations is displayed on the unit's display.

Advantages and disadvantages

Among the indisputable advantages wall-mounted boilers are divided into:

CompactnessThe devices do not take up much space and are suitable for placement in limited space conditions.
Versatility. Most models operate on both main and liquefied gas, which is important in conditions of unstable gas pipeline operation.

Switching the fuel mode is accomplished by simply changing the nozzle in the burner.

Light weight allows you to install the unit on almost any wall.
Relatively low costWall-mounted boilers are cheaper than floor-standing models.

Among the main ones disadvantages wall-mounted boilers are divided into:

Limited power. The maximum power of the units does not exceed 40 kW.
Speed of heating hot water in dual-circuit models it is lower compared to floor-standing boilers. In addition, due to the limited power when using the DHW circuit, the air temperature in the heated rooms decreases.
Sensitivity to coolant quality. For wall-mounted boilers, it is allowed to use only a pre-prepared heat carrier with a minimum oxygen content. Otherwise, a layer of scale will form on the heat exchanger in a short time, significantly reducing the efficiency of the device. This disadvantage is leveled by installing a special filter.
Need for frequent maintenance. Due to the design features of wall-mounted gas boilers, timely maintenance is required. Ignoring this circumstance is fraught with rapid failure of the unit.
Shorter service life compared to floor models. Even if all recommendations specified in the documentation for the device are followed, the service life of any wall-mounted boiler is shorter than that of its floor-standing counterparts.

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Requirements for the premises and the choice of the boiler

The main requirements for the room in which it is planned to install a wall-mounted gas boiler:

square - not less than 4 m², ceiling height – not less than 2.5 m, the width of the doorway is not less than 0.8 m;
presence of a window – the permissible area of the window opening is calculated from the ratio 0.3 m² window area to 10 m³ volume of the room;
plastered walls, absence in finishing elements flammable parts;
presence of a chimney, the diameter of which corresponds to the indicator given in the documentation for the boiler;
presence in the premises pipelines with cold water, ventilation and electricity;
room air temperature – from 5 °C to 35 °C.

Attention! In accordance with current regulations regarding the operation of gas equipment, a wall-mounted boiler is strictly prohibited It is prohibited to install in corridors, rooms without ventilation or a window with a transom, as well as in living quarters, bathrooms and toilets.

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Useful video

From the video you can learn the characteristics of single- and double-circuit wall-mounted boilers, recommendations for their selection.

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Optimal choice

The choice of one model or another depends on the planned operating conditions, as well as on the personal preferences and financial capabilities of the owner. A comprehensive analysis of these factors will allow you to make the best choice, fully revealing all the advantages and leveling out the disadvantages inherent in wall-mounted gas boilers.

Comments

Oleg
When choosing a gas boiler for heating the house, I chose a double-circuit gas boiler Navien. It is quite compact and takes up little space, adequately heats the house and provides hot water. It has an ignition and it works only when there is electricity. Therefore, it is also equipped with an accumulator in case the electricity is turned off. When there is electricity, the accumulator is charged. It has its own convenient thermostat with a remote control, it is convenient because you can set the "HOME" mode there and the boiler will always maintain the set temperature in the room.
06.12.2018 at 18:09
Semyon
When choosing the type of boiler for heating the house, I paid attention to its capabilities, whether it would be able to heat my entire house, its price and whether we had them for sale. As a result, I bought and installed a wall-mounted double-circuit gas boiler Navien. It is quite compact. In the equipped kitchen, it is not even visible. My house has a total area of 210 sq. m. It heats perfectly, in all rooms there is one radiator, only in one of them there are 2 pieces, since it is the largest (40 sq. m). The boiler basically works fine. In operation for 6 years, after 4 years I had to change one heat exchanger. Although the boiler is gas, its operation is completely dependent on electricity, when the power goes out, it does not turn on. Therefore, whoever decides to buy such a boiler should probably think about a generator, but I do not know how the frequency of the current from the purchased generator will affect the boiler, after all, it is all electronic, a frequency failure can lead to a breakdown of the device. If, of course, the stabilizer can cope with this failure, then that’s good.
04.12.2018 at 22:02
Vladimir
Nowadays, of course, there are many different boilers designed for heating a house and heating water. I have a cast-iron gas boiler at home from the Soviet Union, it's a pity, of course, I don't remember the name of the plant, and you can't understand what's written on the plate, it's all worn out. Now I don't see any of these in stores. My boiler is really made for all occasions. It can practically run on all types of fuel. First, it runs great on gas, the consumption is certainly higher than that of modern boilers. If necessary, the gas burners can be removed and fired with any type of solid fuel, either wood or coal, the boiler can also run on electricity. However, I have never fired it with wood or coal in forty years.
04.12.2018 at 02:04
Gleb Yarov
I installed a dual-circuit Navien gas boiler at home. Its exhaust pipe goes outside through the wall of the house, which turned out to be very convenient, it doesn't take up much space and fits in a built-in cabinet in the kitchen, it heats my basement and 2 floors in the house well, its gas ignition works on electricity. The kit includes an accumulator in case of a power outage, otherwise it doesn't work without power. But for some reason, when the power is turned off, it starts beeping, and doesn't want to work from the accumulator until the power is turned on again, it's good that the power is turned off for a short time.
03.12.2018 at 10:51