If you need a wall-mounted gas boiler to heat a private home, how do you choose the best one?

Gas boiler (GK) overhead type — a device designed to heat a home and supply it with hot water.

Fastening is carried out: vertically on the wall, with or without brackets.

There are many types of gas boilers with different characteristics for heating a private home.

Types of gas boilers for heating a private house

There are:

• single-circuit GC;
• double-circuit.

Devices with one circuit used only for heating.

Double-circuit — are capable of simultaneously heating rooms and providing owners with hot water, unlike single-circuit ones.

Characteristics of wall-mounted boilers

In addition to the appearance and configuration features, wall-mounted GCs have characteristics that affect the efficiency of the heating system.

GC are divided into two types:

• Convection — the simplest boilers, the water is heated by combustible gas and a lot of heat immediately goes into the chimney, which greatly reduces the efficiency of the device, but they are simpler, more reliable and not very expensive.
• Condensing — a more modern type, its operation is associated with the installation of an additional heat exchanger that uses steam energy for the primary heating of the working fluid. This complicates and increases the cost of the design, but allows additional use of hot water for other purposes: for washing dishes, installing "warm floors".

How to choose power

The power of wall-mounted GCs directly affects quality of heating of living spaces.

The calculation of the parameter is determined by the factors:

• 

  climatic terrain features;
• quantity heated rooms, their size, number of floors in the building;
• degree of insulation external walls;
• placement features windows, balconies and loggias.

You can determine what capacity of the GC to purchase using the appropriate online calculator.

As an example, let's present the calculation result for a two-story house. of 9 rooms with a total area of ​​about 95 sq. m. (including kitchen, bathroom, corridor, 2 halls and 4 rooms).

Considering that the floors are insulated and the minimum temperature drops in winter up to -20 °C, the calculator will show the required power about 14 kW.

For more confidence, add another 10-20%, Otherwise, in winter the boiler will operate at its maximum capacity.

And if you need to connect an indirect heating boiler (this is necessary to supply the home with hot water), then add another 25-30%.

In total, to heat such a house you will need a boiler with a capacity of 21 kW.

Ignition type

There are GC burners two types:

• Open ignition devices - the combustion process takes place in the chamber, the necessary oxygen comes from the room, therefore, good ventilation will be required. For the removal of gases - a chimney height from 4 meters. Such boilers are relatively inexpensive.

  

  Photo 1. Wall-mounted gas boiler model RT 13 with a closed combustion chamber, thermal power 13 kW, manufacturer - "Oasis".

• WITH closed ignition system - in these devices, air is forced into the combustion chamber and leaves the room in the same way. Both a single coaxial chimney (pipe in pipe) and two separate pipes (air/inlet, smoke/outlet).

Heat exchanger material

A heat exchanger is an element of the gas turbine that provides the working fluid with the required temperature.

The following materials (alloys) are used for manufacturing:

• steel (including stainless steel) and cast iron;
• copper;
• aluminum.

Regular steel and cast iron are not the best materials for a product that is constantly in an aggressive, humid environment.

Such heat exchangers are short-lived and quickly become clogged with rust, in 2-4 years.

Aluminum parts last longer but are prone to oxidation, in addition, damaged alloys are difficult to restore.

Copper alloys and stainless steel are the most expensive materials, but they work longer than others.

Additional functions

GC manufacturers install additional units that transform the boiler into a complex of autonomous equipment. Protective systems are important for boiler safety:

• Flame sensor — the extinguished flame will trigger the safety sensor, and the valve will shut off the gas supply to the combustion chamber.
• Lockout thermostat — switches off the GC if the temperature of the working fluid is extremely high.
• Other sensors and systems are also installed, for example, shutdown block equipment when the power goes out in the house, a board that switches off the gas generator when there is insufficient pressure in the gas main, etc.

Top producers

The market of domestic boiler equipment includes European, Russian and Asian brands.

All devices sold in Russia have the necessary certificates.

Domestic boilers do not have an abundance of complex electronic components, but they are well thought out in terms of features local conditions.

European products (Italian, German) are more balanced functionality and designs, while the Korean ones are stuffed with various improvements.

If the company name does not mean anything, then before purchasing, check the origin of the product, and also find out if there is a service center nearby where you can perform maintenance and purchase spare parts.

Price

The cost of a wall-mounted GC will depend on its type and operating principle, power, and the reputation of the manufacturer.

Inexpensive boilers 25-40 kW will cost 1500-5000 rubles.

Convection - more than 11 kW will cost 20-25 thousand rubles.

Rating of the most economical models

There are the following popular models of gas boilers.

Ariston Egis 24 ff

Photo 2. Wall-mounted gas boiler model Egis 24 ff, two circuits, volume - 8 l, closed combustion chamber, manufacturer - "Ariston".

Serious gas consumption, high cost, most likely related to the brand name.

Baxi Main Four 240 f

A gluttonous boiler, not very economical, the price is obvious overstated.

Navien Deluxe 13k

GC for small houses.

Photo 3. Wall-mounted gas boiler model Deluxe 13k, stainless steel heat exchanger, thermal power up to 13 kW, manufacturer - "Navien", Korea.

The price is too high for this category of devices. Heats up to 130 sq. m. area.

Neva Lux 7218

In terms of efficiency for average-sized homes, it is one of the leaders, but the power may not be enough for large spaces and northern areas.

Photo 4. Gas boiler model Lux 7218, power 18 kW, closed combustion chamber, manufacturer - "Neva".

Heats up up to 180 sq. m of living space.

Neva Lux 8618

The only advantage of the gas generator is the price. But with such gas consumption, the financial losses will be too high.

Copes with the heated area in 180 sq. m.

Protherm Lynx 24

Photo 5. Gas boiler model Lynx 24 double-circuit, heat exchanger made of stainless steel, manufacturer - "Protherm".

Boiler one of the first on the list, but the increased gas consumption and significant cost of the equipment do not allow it to be called among the leaders.

Vaillant Turbotec Plus VU 122

Boilers of the Valliant company economical, but their high price makes the payback period too long.

Vaillant Turbotec Pro VUW

Photo 6. Gas boiler model Turbotec Pro VUW, single-circuit, with a closed combustion chamber, manufacturer - "Vaillant".

Heats the area up to 240 sq. m.

Viessmann Vitodens 100 w

The most powerful and economical. With the same gas consumption, the efficiency of operation is higher than that of other models. In addition, the owners give the most positive reviews of this product, which, given the high cost of the equipment, indicates reliability goods.

The boiler is capable of heating rooms 130—350 sq.m. depending on the model.

Useful video

Check out the video that talks about the best models of wall-mounted gas boilers.

Selecting a GC based on its characteristics

German boilers are recognized as the most economical Viessmann Vitodens (estimated efficiency 92%), A special high-tech burner supports several operating modes.

The built-in timer and the GC control system allow you to fine-tune the boiler room operating modes over a long period of time.

However, the choice of a boiler is made with an eye on real conditionsPurchasing a powerful device for temporary heating of a small one-story building is not a practical solution.

To calculate the required power and other operating parameters, please contact specialists.