How to choose a gas boiler. Rating of the best gas boilers for a private house. How to choose the one? Which gas boiler to choose for home heating

A gas boiler is a heating device that uses natural main gas to generate heat. This type of fuel is cheaper than electricity, which is why gas-powered devices are so popular. "Plumber Portal" will talk about the features of the equipment so that you can choose an efficient, reliable and safe single- or double-circuit gas boiler for home heating from the whole variety of these devices.

To understand which unit is better for an apartment or house, you must first study the types of gas-fired heating boilers.

So, domestic gas heating boilers can be classified as follows:

1. Material: cast iron, steel, copper.
2. By location: wall and floor.
3. By type of combustion chamber: open and closed.
4. By the number of circuits: single-circuit and double-circuit.
5. By the presence of additional functions, automation, external characteristics.

Let's analyze the types of gas boilers in more detail.

Heat exchanger material

It is worth choosing the internal heat exchanger of heating equipment very carefully, since liquid circulates inside it, and a powerful flow of thermal energy moves outside. Therefore, the material of manufacture of the heat exchanger must have good thermal conductivity, on which the efficiency of the device depends, and at the same time a high margin of safety.

Manufacturers install gas heat exchange coils made of:

• cast iron;
• of stainless steel;
• copper.

At first glance, a boiler with a cast-iron heat exchanger is the most reliable, since it is the least susceptible to corrosion. However, such units are very heavy, and very often, due to non-compliance with the operating rules of the device, the cast iron heat exchanger cracks in the zone of contact of a liquid with a very different temperature. Such a device requires more frequent washing.

In this regard, many homeowners choose to connect a steel heat exchange coil. Stainless steel devices are cheaper than copper and cast iron units. In addition, steel is very ductile, so the likelihood of cracks in areas with temperature changes is much lower. However, such heat exchangers, being in the heating circuit, quickly corrode.

Thus, the most reliable choice is a copper heat exchanger. Copper has the best heat transfer rate, is highly resistant to corrosion processes, has good ductility, and is light in weight. Copper heat exchange coils are very compact, but the high price of such devices makes it necessary to opt for less reliable, but cheaper units.

Heat exchangers also differ according to the type of internal structure: conventional and bitermal. In the first case, only one liquid circulation circuit is connected, and in the second case, two water circulation circuits can be connected simultaneously. Double-circuit boilers are equipped with two conventional heat exchangers or one bithermal coil, which is much more economical.

Combustion chamber and burner type

Heating is impossible without maintaining the combustion of gas with the help of room or street oxygen. In the first case, the heater package contains an atmospheric burner for natural circulation of air flows, and in the second case, the device is equipped with a closed burner with forced oxygen injection. In this regard, the consumer can choose a gas boiler for the house with one of two types of combustion chamber:

1. Open - to maintain the combustion process in the furnace, air comes directly from the boiler room or the room where gas equipment is installed.
2. Closed - oxygen for burning the flame is taken from the street with the help of additional ventilation or a chimney designed according to the "pipe in pipe" principle.

If we choose between a closed furnace with a turbo burner and an open chamber with an atmospheric burner, then it should be understood that an open combustion chamber will require the installation of a chimney of 5-7 meters to ensure natural draft, which is not always possible. Therefore, each individual case requires an individual approach.

Wall and floor models

Everything is very clear here - floor-standing gas boilers for heating a private house can only be installed on the floor, since their dimensions, weight and power are much larger than a wall-mounted gas boiler, which is used when space is limited. Wall-mounted gas heating boilers are usually mounted in the kitchen of an apartment building.

At the same time, the installation of a gas boiler in an apartment requires compliance with certain installation standards, which are much stricter than when a gas boiler is installed in a private house.

1. Wall-mounted appliances have a relatively small power, which averages 35 kW, since wall-mounted boilers are equipped with a copper heat exchange coil that cannot withstand too high temperatures.
2. Gas floor units are the best choice for a heating device for a private house, since such equipment can easily heat a building up to 700 square meters. There are even outdoor models that can be installed outside a residential building.

Floor double-circuit or single-circuit devices, depending on the batch configuration, can be equipped with a turbocharged or atmospheric burner. A distinctive feature of turbocharged models is high efficiency and a high margin of safety, while a unit with an atmospheric burner is more durable and less noisy, and their cost is less.

Single and double-circuit gas boiler

Considering the varieties of gas equipment for heating, one cannot fail to note its differences in the number of circuits.

A single-circuit gas boiler for heating a private house in its standard configuration is used only for heating a building, and floor or wall-mounted double-circuit devices, in addition to space heating, also supply hot water to water intake points.

In order for a single-circuit gas boiler for heating private houses to also perform the functions of double-circuit devices, you can additionally connect a boiler. But still it is better to immediately use a double-circuit gas boiler for heating houses.

Connection diagram of a single-circuit unit with a boiler:

There are also significant differences in the design of these types of heating gas equipment.

The double-circuit wall-mounted is much more compact than its single-circuit counterparts, so they are the best option for a small room with a lack of free space. At the same time, such models put forward higher requirements for operating conditions.

Since double-circuit devices heat the water in the system, in order to automatically turn on the hot water supply, it is necessary that the incoming water flow has a good pressure and therefore the consumption of hot liquid increases significantly.

In addition, the double-circuit floor version is not very suitable for rooms with a large area if the water intake points are too far from the liquid heating device. This feature of double-circuit equipment is due to the fact that in this case an additional circulation pump cannot be connected.

Single-circuit devices also have design features that affect the operation and installation of gas equipment. First of all, it is worth noting the large dimensions of such units, as well as the laboriousness of the process of installing a gas boiler in a private house.

Moreover, if a boiler is included in a single-circuit system, then it can be equipped with an additional circulation pump, which will supply hot water to several water intake points - a shower, a kitchen, a sink, however, the efficiency of such single-circuit heating equipment is limited by the volume of the boiler, and the cost of the system increases.

What is the best appliance for your home?

The selection of a gas boiler for a private house largely depends on the area of ​​\u200b\u200bthe room and other factors.

The technical documentation for the gas heater certainly covers information about the requirements and rated power of the device. Often the manufacturer indicates the area of ​​\u200b\u200bthe room that this boiler can heat, as well as instructions on how to install the unit.

When calculating, an experienced heat engineer should take into account:

• cubic capacity and area of ​​the room;
• climate of the region of residence;
• quality of external thermal insulation of walls; the number and size of windows, as well as what type of double-glazed windows are installed in them;
• the presence of balconies and street doors;
• heating data, etc.

In addition, it is necessary to take into account the quality of the fuel and the gas pressure in the line. A separate calculation must be made for the DHW system. And only after that, both figures are summed up, and then increased by 15-20% for the reserve, so that the boiler can cope with peak and constant load.

There are a lot of characteristics for choosing a gas boiler, but the main ones are:

1. Output power of equipment.
2. Layout device (the number of circuits, the material from which the heat exchanger is made, the type of housing).
3. Place of installation.
4. Is there automation for the safe operation of the equipment.
5. Price. It's not always cheap and poor quality.

All these points are interconnected. In the absence of space for mounting a large unit, or the desire to install a device in the kitchen whose appearance will be in harmony with the interior of the room, they are forced to opt for a wall-mounted model, whose power is much less compared to a floor-standing device. And if it is necessary to heat hot water, they are forced to buy double-circuit equipment.

The best models of gas boilers

Today, the market offers a wide range of this equipment in various price categories - from fairly cheap Chinese-made products, which are of rather dubious quality, to boilers with turbocharged combustion chambers and other technical bells and whistles from branded manufacturers, but the price of such devices is quite high.

There are several types of gas boilers, so when choosing equipment for your home, you need to know exactly what you need.

1. Vaillant atmoVit INT 164-564 / 1-5 is the best device for a house ranging from 50 to 150 m2. The cost is 81,000 - 100,000 rubles.
2. Bosch WBN6000-18C RN S5700 is the optimal two-circuit model for a building area from 100 to 180 m2. Price 36,000 - 43,000 rubles.
3. Viessmann Vitopend 100-W type A1JB 12 kW - the best value for money in a double-circuit condensing version for a building up to 120 sq m.
4. Ferroli Divatech F24 D is the best option for heating and hot water supply of a building ranging from 100 to 240 m2. Price 40,000 - 45,000 rubles.
5. BAXI SLIM 1.490 iN is the best single-circuit unit for heating a private house from 200 to 300 m2. The cost is 70,000 - 78,000 rubles.
6. Buderus Logano G334WS-73 is an ideal model for a home with an area of ​​more than 300 m2. The cost is 315,000 - 350,000 rubles.
7. Protherm Medved 30 KLOM is the best floor-standing Proterm model with an open burner, for buildings up to 260 m2. Price 49,000 - 55,000 rubles.
8. Irbis Khoper 25 SABC is the most budgetary unit with acceptable build quality for buildings up to 250 sq. M. The cost is 33,000 - 36,000 rubles.

These companies have been presenting their products on the market for a long time and their quality has been tested by a huge number of customers. Domestic equipment ("Irbis"), although inferior in terms of ease of use and performance characteristics to devices manufactured by foreign firms, they perform their main task properly.

The temperature characteristics of all models do not differ much. All boilers comply with all safety standards and norms, but more expensive models have a complex multi-stage self-diagnosis system, as well as quite effective automatic protection. The service life and reliability of the equipment are characterized by the quality of assembly and parts, and, of course, compliance with all requirements and operating standards.

Rules and subtleties of installation

Site consultants recommend strictly following the rules for installing a gas boiler. To install such equipment in the house, you must obtain permission. This opportunity will appear only after a number of the following conditions are met:

• the room must be equipped with good ventilation and a source of natural light, which will be required for maintenance of the equipment;
• in the boiler room, the ceilings should be at least two and a half meters, the area of ​​\u200b\u200bthe room should be at least 4 m2, the doorway should be at least 80 cm wide;
• the power supply system must be equipped with current and thermal protection. The choice of a voltage stabilizer for gas boilers is a separate point that needs separate consideration and needs to be given enough attention;
• The width of the chimney directly depends on the power of the boiler. For example, the power is about 30 kW, then the diameter of the chimney must be at least 13 mm;
• availability of pressure and temperature sensors;
• it is forbidden to install gas equipment in the basement;
• the gas pipeline must not be laid in fire hazardous areas;
• regardless of the type of gas pipeline (closed or open), the pipes for it must be metal;
• in the boiler room, it is necessary to have a gas level analyzer, as well as an electric valve, which, if necessary, will shut off the gas supply.

Useful advice! To install a gas boiler, as well as draw up all the necessary documentation, you need special tools and professional skills. If you have neither one nor the other, then the best solution would be to contact the organization that does this.

If you decide to change the old heating equipment to a new one yourself, then it is best to do this in the following sequence:

• flush the old heating system. If the pipes are clogged, this will significantly reduce the life of a new boiler, even of very high quality, so it is recommended to use a special compressor to eliminate blockages and dirt. If it is impossible to clean the pipes, then simply replace them with new ones;
• dismantle old equipment;
• install new equipment, taking into account all the recommendations that are in the boiler operating instructions;
• connect the boiler to the flue system. If the house does not have its own chimney, then it is better to take care of purchasing a coaxial chimney. The equipment manual usually refers to the requirements for the characteristics of the chimney. This is a rather important point, since due to the insufficient width of the chimney or its low height, most of the combustion products will enter the room;
• the boiler must be connected to the gas pipeline. You can't do it by hand. This is done only by organizations that have the appropriate permission;
• the unit crashes into the heating system and the DHW system;
• commissioning works are being carried out. They are a rather important point during installation, since the efficiency of both the boiler itself and the entire system depends on them in the future.

To install a new gas boiler, you will need to perform a number of the following steps:

• check the availability of all components - they must have a mounting template, a bar for connecting gas and water, the necessary pipelines and the boiler itself;
• select the level in order to fix the hinged bar, then attach it;
• install gas and water pipeline gaskets by removing protective plugs;
• mount the boiler itself, then connect the water circuit and the gas supply system to it;
• connect the power supply and equipment to the chimney.

Particular attention should be paid to voltage drops. Which voltage stabilizer for a gas boiler is best suited depends on the power model of the equipment itself.

Thus, before choosing a gas boiler for a private house, it is necessary to determine the requirements for its functionality. For houses where there is a boiler or a column, the purchase of a double-circuit boiler will be an irrational decision, due to the extra spending of money, but if there is a need for DHW, a double-circuit gas boiler for heating a house will be the best solution.

The rating of double-circuit wall-mounted gas boilers will allow you to determine the optimal model that matches your budget and home interior. The temperature parameters for all modifications are practically the same. More expensive variations have a multifunctional self-diagnosis system. The working life and reliability of the device is determined by the quality of the assembly and the safety of the mounted elements. devices are designed for heating rooms of various types with the possibility of simultaneous supply of hot water. Consider several brands that are recognized as leaders in the respective market.

Wolf GGG-1R-24 system ("Wolf")

In the ranking of dual-circuit, this device occupies a leading position. The device is equipped with the function of forced smoke removal, has a closed working compartment. The built-in fan allows you to adjust the number of revolutions depending on the length of the outlet pipe used.

The benefits of modification include the following:

• High efficiency.
• Mounted on the wall without side access.
• It is possible to connect to the mains with natural and liquefied gas.
• Instant start of hot water supply is provided.
• Soft start, compact dimensions and relatively low weight of 40 kg.
• Provided automatic type Wolf CGG-1K-24.
• Thermal value - 9.4-24 kW.
• The presence of a pair of heat exchangers made of copper and stainless steel.
• The expansion tank has a volume of 8 liters.
• High build quality, ease of installation, reliability of the design complement the advantages of the unit.

Bosch-6000 W ("Bosch")

In the ranking of double-circuit wall-mounted gas boilers for heating a private house, this German brand occupies a leading position. The unit is specially designed taking into account the peculiarities of the climate and energy supply of various regions of the Russian Federation. The device has wide functionality.

Its advantages:

• Ergonomic and original design.
• The compact dimensions do not interfere with the installation of equipment in small-sized residential and utility rooms.
• Stable operation is ensured even with intermittent voltage and pressure in the working pipeline.
• Fuel is saved due to the presence of high-tech elements and connections.
• Functioning of the main and bottled gas is possible.
• Improved smoke removal and fire safety system.
• Power - 24 kW.
• Type of a working chamber - the closed compartment.
• Productivity - up to 11.5 liters of hot water per minute.
• High-quality assembly and focus on working in difficult conditions in some regions of the Russian Federation.

Baxi Luna-3 Comfort 240 Fi ("Baksi Luna")

The rating of double-circuit wall-mounted gas boilers will be continued by a representative of Baxi. The model is fully oriented to work in the Russian water and gas supply system. The unit is able to fully function even when the inlet pressure drops to 5 mbar. The removable panel is equipped with a digital screen, acts as an indicator of the outside air temperature, aggregates with liquefied gas, and is equipped with a water filter element.

The disadvantages of users include the high cost and sensitive electronic control system. There are incomparably more advantages in this device:

• The node is adapted to domestic features of operation.
• The removable panel and the closed combustion chamber increase efficiency to the maximum level.
• The design is not in vain one of the best wall-mounted double-circuit gas heating boilers, the rating of which is presented in the article. This is due to the presence of a liquid crystal control screen and indicator, as well as the possibility of self-diagnosis.

Navien Deluxe 24K ("Navien Deluxe")

This brand also got into the best rating of double-circuit wall-mounted gas boilers. The device is equipped with a closed combustion chamber, which is adapted to work in domestic conditions. A functional menu and original design complement the quality characteristics along with an affordable price.

Advantages of the unit:

• A frost protection unit is provided, which operates in automatic mode, maintaining the operating temperature from 6 degrees.
• The stability of functioning is noted in the case of reduced flow of water pressure and gas pressure.
• The system comes with a remote control.

Rating of wall-mounted double-circuit gas boilers of the brand "Cheetah 23 MOV"

These units are designed for houses in the private sector and apartments that need to provide hot water and heating. The efficiency of the unit is more than 93 percent, they produce at least 11 liters of hot liquid per minute.

Advantages:

• Convenience and simplicity in management and service.
• Existence of the liquid crystal informative screen.
• Heating elements and burners are able to function independently of each other.
• There is a possibility of self-diagnostics of the equipment.
• There is a work switch depending on the season of the year.
• Complements the package with an efficient circulation pump.
• Protection against overheating, freezing and excessive pressure is provided.
• There are indicators for the presence of a flame and draft in the chimney.

The negative aspects of users include the need to install a filter at the inlet when water is supplied, as well as the arrangement of the structure exclusively in rooms with a chimney.

Valliant ecoTec plus VUW INT IV 246 ("Valliant")

From this manufacturer, wall-mounted gas double-circuit boilers have a rating of more than 9.5 points on a ten-point scale. The German unit is capable of delivering thermal power in the region of 20 kW, which is enough to heat an area up to 200 square meters in size. The device in question belongs to the class of condensing heaters. This design allows you to use less gas while maintaining the desired temperature.

Modification features:

• Aqua-Power-Plus option for power up to 24 kW.
• eBus type digital module and DIA analytical system.
• Application in places with low temperature heating mode.
• The function of air intake from the inner and outer shell is provided.

Buderus Logano G234 WS-38 ("Buderus Logano")

In the rating of wall-mounted double-circuit gas boilers of a closed type, this brand received a rating of 9.8 on a ten-point scale. The unit belongs to the powerful category, focused on heating large areas. The thermal power of the device is 38 kW. This allows for heating a space of 380 square meters.

A gas double-circuit wall-mounted boiler, whose reliability rating is one of the best, is adapted to work in domestic conditions. The device can provide not only heating, but also water heating, due to the large volume and automatic type of control.

Model Baxi Duo-tec Compact 24 ("Baksi Duo")

The Italian brand continues the rating of the best wall-mounted double-circuit gas heating boilers. The device is equipped with a closed working chamber, two heat exchangers made of stainless steel. The boiler is easy to maintain and install, adapted to work in the conditions of domestic electrical and gas supply. The minimum power is up to 5 mbar at the input.

Peculiarities:

• Compact dimensions and low weight.
• The high efficiency rate is up to 35 percent for the heating period.
• There is a mode of deep modulation modes.
• The unit is characterized by low noise and vibration levels.
• Money is saved on equipping the chimney (an analogue version with a reduced diameter and outlet of exhaust gases through the wall is available).

Power calculation options

Gas wall-mounted double-circuit heating boilers, the rating of which is given above, require the correct calculation of power during operation. Let's consider these parameters in several available versions.

• Approximately take 1 kilowatt per square meter of heated space. In this case, the maximum power of the equipment is taken into account from the average external temperatures and structural features of the room.
• The second method also does not require the use of special formulas and calculations. The operating values ​​are multiplied by a correction factor, which is 1.5 for Moscow, and 2.0 for the northern regions. For summer-type buildings that do not have good insulation, this indicator increases to 4.0, taking into account the characteristics of the building, in this way it is possible to select the required value quite accurately.
• The third option is considered the most difficult. It is based on the calculation of all heat losses of serviced compartments. The scheme takes into account the maximum and minimum ambient temperatures, as well as the features of the building.

Peculiarities

It is worth noting that the rating of double-circuit wall-mounted ones shows their variety according to the type of heat exchanger and the possibility of preparing hot water. It should be noted that the block for heat exchange is carried out in a bimetric or separate design.

The first option serves as a node with a pair of circuits that are equipped with coaxially located pipelines (pipes are placed one inside the other, larger in diameter). Such designs have fewer elements, but require careful maintenance to avoid the formation of scale and deposits.

Separate heat exchangers are heated from the primary power source, their price is an order of magnitude more expensive than paired options. They are less sensitive to salts and other intrusions in the composition of the water, but require the inclusion of additional taps and control devices. This variation allows you to get a larger volume of hot water in a certain unit of time.

Burners

These elements are divided into atmospheric types and supercharged samples. For wall-mounted models, the burners are predominantly of the built-in type. They are selected based on the required parameters and power.

Atmospheric specimens receive a working mixture of air and gas by exposure to excess pressure. This option belongs to the simplest and most common method in the category of small and medium-sized boilers. The pressurized burner receives the gas-air mixture with the help of a built-in fan. Using the ability to adjust this device, you can adjust the operating modes and power of the device. This allows you to get rid of power surges and pressure, but it is costly with an increase in noise during operation of the unit.

Air intake

This parameter is one of the most important in the ranking of wall-mounted gas double-circuit boilers in terms of reliability. There are modifications with an open or closed working combustion chamber. The first variations function by taking air directly from the serviced premises. This method is simple, but requires additional replenishment of the external cold flow. This will require a powerful ventilation system, part of the energy of which is spent on heating the incoming air.

Models with a closed combustion chamber receive flow through a separate pipeline from the street. To do this, with the help of a fan, additional traction is created. This design has its advantages in terms of economy and less dependence on the arrangement of the chimney. At the same time, it is noisier, more expensive and volatile.

Condensation or convection?

This indicator for double-circuit boilers is in first place. Convection standard models lose some of the energy along with the exhaust gases. Their efficiency is about 90 percent. This aspect increases in proportion to the temperature of the gases (the lower it is, the higher the performance of the equipment). However, there is one feature: when the operating temperature reaches above 56 degrees, a condensation effect is observed. This phenomenon has a very aggressive effect on the elements of the device, capable of bringing them to a non-working state in a couple of seasons. As a result, the maximum temperature is no more than 100 degrees, giving the rest of the heat to no avail.

The condensing wall-mounted double-circuit ones that we examined are more economical, but they require several mandatory measures. The efficiency of such models is higher than traditional models by 10-12%. Condensation is carried out directly in the equipment, which uses not only the internal temperature, but also the indicators released during condensation. The result is the so-called higher combustion value.

Gas boilers are widely used heating appliances. Heat is generated by burning natural gas (methane or propane-butane), and its amount is usually sufficient to heat water for everyday use. For those people who decide to buy such a device, the question always arises as to which gas boiler is better. To make a choice, you need to know the features of these devices and their types. You can see what modern gas boilers look like in the photo.

Advantages of gas boilers

There are several reasons for this popularity:

• ease of operation - after installation, regular maintenance is not required;
• efficiency - gas is considered one of the cheapest sources of energy;
• the possibility of automating work;
• availability and variety of types - among a wide range of models, you can choose exactly the option that is suitable both in terms of technical characteristics and cost.

Power, which gas boiler is better

However, such a calculation allows only approximately calculating the required power of the device, since it is also necessary to take into account the level of heat transfer and heat loss (the presence of a basement, material and wall thickness, glazing, ceiling height, quality of thermal insulation - all this affects heating efficiency). Individual needs also matter - someone feels comfortable at 20 degrees of air, and someone prefers to be in a warmer room.

If there are doubts that it will be possible to make the correct calculations on your own, then it is better to call specialists who will take into account all the features of the house.

Power regulation

Depending on the ability to control the process, gas appliances are divided into:

• single-stage;
• two-stage;
• with smooth adjustment.

Single-stage heating units have only one power level, they are the cheapest. Two-stage have two degrees of power. If possible, it is better to buy more expensive boilers with two-stage or smooth adjustment - this will allow you to maintain a comfortable environment in the room.

In the case of using single-stage boilers, it will be difficult to create a cozy atmosphere in the house during the off-season - it can be hot with the boiler turned on, and cold without heating.

Wall and floor gas boilers - comparison

In addition, they are much easier to install than outdoor ones. However, it should be borne in mind that their power is not enough to heat a large area, and the service life is shorter due to the fact that steel or copper is used to facilitate the construction, and not cast iron.

But if the heat unit is bought for a private house, then it is advisable to stop the choice on the floor model. A comparison of gas heating boilers clearly indicates the advantages of floor appliances. They should be installed in a separate room, converted into a boiler room by creating ventilation and a chimney (in more detail: ""). As a result, heating will be highly efficient and safe.

Single-circuit and double-circuit boilers - types

If you need a large amount of hot water, then it is better to buy a boiler with a built-in boiler, having previously figured out which gas boilers are best for a private house. If you need a little water (for example, in order to wash dishes and take a shower), then a device with a flow heat exchanger will be the best solution.

If we compare gas heating boilers, then it is impossible to say unequivocally which is better - single-circuit or double-circuit. To decide, you need to find out whether it is enough just to heat the house or it will not be superfluous to provide all household members with hot water.

Natural and forced circulation

Of course, such a heater requires a special room for installation so that the health of the residents of the house is not harmed.

Forced draft boilers use turbo or forced draft burners and the combustion chamber is closed. Air is taken either from another room (this option is rare) or from the street. Combustion products are removed through air ducts of small diameter using a built-in fan. Of course, such devices can be installed in any premises. The best gas heating boilers for an apartment are with forced draft.

It is believed that atmospheric burners are more practical, they work longer and quieter, but forced draft boilers do not burn oxygen in the room. Thus, it is pleasant to be in a heated room. As for forced draft burners, they are not so sensitive to pressure drops.

Condensing and convection boilers, which is the most reliable

• convection;
• condensation.

Condensation devices also use the energy of the transition of fuel from a gaseous to a liquid state. Such boilers are more expensive than conventional units, but they have a higher efficiency. These types of gas heating boilers are equally in demand, the choice depends only on what you plan to save on - on the cost of the device or on the fuel that will be used in the future.

Since condensing boilers have a higher efficiency, they are very popular in European countries. They allow good savings on fuel, so it pays off quickly.

Ignition and thermostat features

The devices can use different types of thermostats. The standard device performs only one function - it maintains the set temperature (more details: ""). Programmable thermostats have a number of additional features. For example, you can set the temperature for several days, change it at different times of the day. All these features allow not only to save on fuel, but also to maintain comfort in the house.

The most expensive are devices with thermostats, which, using a special sensor, count even slight temperature fluctuations in the street and regulate the power of the unit depending on this.

Gas boiler heat exchanger material

The most reliable gas boiler is cast iron. Despite the fact that cast iron products are sensitive to temperature changes, they serve for at least several decades. Since cast iron boilers are heavy, they are found only in the floor version.

Steel structures have less weight, besides their cost is low. But at the same time, they are subject to corrosion, and, accordingly, they are not able to serve for a long time. For this reason, they are not the best option.

Gas boiler manufacturers

As for whether foreign technology is really better than domestic products, this is not always the case. But as far as gas boilers are concerned, there is no doubt about the correctness of this statement - imported appliances turn out to be more reliable and convenient to use.

When choosing, you need to consider the following characteristics of the boilers:

• material of manufacture;
• the number of contours;
• thermostat type and ignition method;
• installation option (floor or wall);
• number of power levels;
• type of energy use (convection or condensing).

But at the same time, we must not forget that natural gas is a dangerous type of fuel, and the installation of gas equipment will require obtaining an appropriate permit. In addition, any natural gas heater should be placed in a separate room with good ventilation and a chimney.

In order to always be comfortable in the house, the boiler must also be equipped with a thermostat that allows you to change the degree of heating depending on the air temperature.

The choice of a gas boiler is the responsibility of the consumer. And if experts help you correctly calculate the power, then you will have to choose the right model with a certain set of characteristics and functions yourself. To make the right purchase, knowing the selection criteria, the advantages and disadvantages of a particular gas equipment, our rating of the best wall-mounted boilers will help.

Gas boilers are divided into different types according to certain parameters:

• by the number of thermal circuits;
• by type of performance;
• by power;
• according to the method of heating;
• by type of combustion chamber;
• according to the degree of dependence on electricity;
• by the number of control modes;
• by type of burners;
• by type of ignition;
• according to the method of removal of combustion products;
• according to the material of the heat exchanger;
• by manufacturer;
• on a set of additional functions.

It is a difficult task to choose the optimal attachments that will effectively heat the room, at the same time heating water for hot water supply in a country house or apartment, fit into the room in size, and have the necessary functionality for efficiency and comfort. Knowing the principle of dividing boilers into groups, it will be easier to find the modification of equipment you need specifically with an eye on the top of the best.

By the number of thermal circuits

A thermal circuit is a closed system of pipelines, a boiler, and equipment that heats a room or coolant. Gas boilers are standardly divided into:

• single-circuit VU (the task of the circuit is one - heating);
• double-circuit VUW (each circuit has its own engineering function: 1 - heating, 2 - water heating for hot water supply).

In the first case, the efficiency of a gas boiler is aimed at heating the coolant (water, antifreeze) for space heating, and the owners receive hot water using other equipment, such as an electric boiler.

In the second case, the coolant is heated in the 1st circuit for the heating system, and in the 2nd circuit for hot water supply. Some models can, according to the instructions, be turned from a two-circuit into a single-circuit.

By type of performance

There are 2 types of boilers on sale:

1. floor-standing (more powerful, heavy, often double-circuit, having separate additional equipment: a circulation pump and an expansion tank);
2. wall-mounted (with less power, more affordable, lighter and more compact, where all the necessary working equipment is built inside).

Wall-mounted boilers have really conquered consumers. Both the owners of private houses and apartments in apartment buildings with individual heating prefer wall-mounted design.

By power

Gas wall-mounted boilers produce small (4 - 15 kW) and medium power (15 - 25 kW). Powerful appliances (25 - 40 kW and even 100 - 150 kW) are also available in wall-mounted versions, but are less in demand.

The most popular models in terms of approximate power:

• 10 kW;
• 12 kW;
• 15 kW;
• 20 kW;
• 25 kW;
• 30 kW;
• 35 kW.

It is better to entrust the calculation of power to specialists or at least convenient online calculators that have been developed by many manufacturers of gas heating equipment. The old familiar formula that considers power in the proportion of 1 kW or 1.2 kW with a 20% margin per 10 m² does not work for most country houses with huge ceilings, panoramic windows, reinforced or insufficient insulation.

According to the heating method

The principle of heating for such equipment is divided into:

• traditional convection;
• condensing.

In a convection gas boiler, fuel burns, water heats up, and waste products go into the chimney. In condensing technology, the efficiency is 20-30% higher due to the use of not only the energy of the fuel, but also the resulting condensate, i.e. steam energy. Such a boiler, when equipped with an outdoor temperature sensor and a coaxial chimney, becomes more profitable than the traditional model. Low-temperature condensing gas boilers in hinged design are the most advanced in terms of efficiency.

Type of combustion chamber

Gas boilers have modifications according to the type of combustion chamber:

• open;
• closed.

The type of chimney depends on the type of combustion chamber: natural draft for open (more often for floor-standing boilers), forced draft (more often for wall-mounted boilers). Almost all modern wall-mounted units come with a closed firebox and exhaust output to a coaxial chimney pipe.

According to the degree of dependence on electricity

It seems that the 21st century is outside the window, and not everywhere the dependence of the operation of gas equipment on the availability of electricity is useful. Indeed, in areas where there are problems with power outages, a great distance from large settlements, etc., a boiler that works autonomously will be more reliable. According to this parameter, the technique is divided into:

• non-volatile (the operation of a gas boiler does not depend on electricity supply);
• dependent on the supply of electricity (no electricity - the operation of the boiler stops).

Where there are frequent voltage drops in the network, low voltage (160-180 V, not 220 V), it is imperative to provide for the installation of a voltage stabilizer, otherwise many imported boilers with capricious "brains" will simply refuse to heat.

By the number of control modes

There are the simplest devices with 1 mode in which fuel is supplied. There are more common ones with 2 modes (average 30-40% and maximum 100% power). The most economical models are multi-mode, which allow you to automatically or independently adjust the fuel supply depending on the street temperature from 10 to 100%.

The burners control the modes:

• single-stage (then the boiler will be single-mode);
• two-stage (there will be 2 modes);
• two-stage with smooth modulation of switching modes;
• modulating (several modes), which come with electronic, pneumatic and mechanical control.

Type of burners

Burners can be:

• atmospheric (when their work (the strength of the burner flame) depends on the gas pressure in the line);
• inflatable (when the built-in fan blows air).

According to the material of manufacture, they distinguish:

• steel;
• from stainless steel.

According to the principle of the flame:

• blast (with a fan);
• diffuse (industrial equipment);
• injection (with injection).

By type of ignition

Ignition in modern boilers happens:

• electric;
• on piezoelectric elements.

For non-volatile boilers of Russian manufacturers, piezo ignition is more common. For imported ones with a lot of automation - electric. But recently, most of all manufactured boilers are equipped with an electric spark for ignition, it is safer. If you have an area with frequent and strong winds, then the electric type of ignition should be a priority. So that after the flame is blown out by the wind, it is ignited automatically by an electric spark.

According to the method of removal of combustion products

Thrust is engaged in removal of products of combustion of fuel. According to its type, traction is:

• natural (chimney);
• forced with turbocharger.

If there is a separate boiler room and problems with power supply, then a natural draft boiler can be considered. But now all wall-mounted boilers are taken mainly to small rooms, and the arrangement of a coaxial chimney is a budget and comfortable solution. Yes, and turbo ventilation is much safer, so as not to burn out.

life hack

Freezing of a coaxial pipe can be prevented in several ways:

• insulate the outer pipe with mineral wool and a protective casing made of plastic pipe;
• cut the outer or increase the inner pipe by 15-20 cm so that a dew point is not created;
• initially take the maximum length of the coaxial chimney recommended by the manufacturer;
• increase the slope to the ground by 2-3 cm.

According to the material of the heat exchanger

The heat exchanger is the most wearable element of the boiler, therefore, the period of trouble-free operation of all equipment depends on its material. They are produced:

• stainless steel;
• copper;
• cast iron (very rare for wall-mounted due to the weight of the metal).

Table of consumer qualities of heat exchanger materials:

By manufacturer

Leaders of the world gas equipment:

• German manufacturers (brands: BUDERUS, BOSCH, VAILLANT, VIESSMANN, WOLF);
• Italian (FERROLI, BAXI, ARISTON);
• Korean (NAVIEN);
• Slovak (PROTHERM).

And, of course, domestic manufacturers, whose products are distinguished by unpretentiousness and survivability in the difficult conditions of the Russian winter and the unstable operation of the gas system and electricity supply:

• "ZHMZ";
• "Lemax";
• "NEVA".

According to the set of additional functions

To organize hot water supply, single-circuit boilers must be supplemented with an indirect heating boiler. Double-circuit ones also do not always do a good job of providing hot water supply, because. flow heating has its drawbacks: when you open a tap at the second point, barely warm or cold water flows from the first. Therefore, for double-circuit boilers, a boiler is also an option.

In regions with severe climatic conditions, the boiler must be protected against freezing. In expensive models, it is built-in.

For the “smart home” system and the desire of the owners for maximum comfort, the equipment is equipped with numerous sensors and relays for controlling processes (traction sensor, outdoor and room temperature, carrier temperature, auto-off, protective relays, etc.).

A gas boiler in the presence of a gas main and communications connected to them is the most economical option for heating and hot water. In addition to the ability to save on heating and hot water, gas-fired boilers have the following advantages:

• high percentage of efficiency (up to 100 - 110% for condensing models);
• compact wall-mounted;
• require little attention: it is possible to completely give control and control to automation;
• comfort of domestic use: houses are always clean;
• available non-volatile models allow you not to be left without heating and hot water when the electricity is turned off;
• a huge selection of modifications will help you choose the best boiler for a particular room and task;
• relative affordability and serviceability in case of failure.

There are also disadvantages, but they are not critical:

• bureaucratic burden when connecting and servicing;
• large rooms require floor boilers and a separate boiler room;
• a boiler with an open firebox must be equipped with a convection chimney with natural draft, which takes oxygen from the room, so this equipment is brought to the boiler room;
• turbocharged models are noisy;
• volatile boilers need to be equipped with extremely expensive UPS.

Manufacturers produce a huge number of modifications of wall-mounted boilers so that the consumer can choose something that is most optimal and with a minimum number of disadvantages for their situation. The choice itself is best based on the specific tasks of the boiler and the parameters of the room for heating.

• heated area (we are looking for models for rooms up to 100 m², up to 200 m², up to 300 m² and over 350 m²);
• the number of circuits and the required volume of hot water supply (single-circuit with a built-in tank for a small apartment and 1-2 people, single-circuit with an indirect heating tank for a family of 3-4 people, double-circuit with one draw-off point, with two, etc.);
• volatile, but economical, automated and ultra-modern or non-volatile, but very simple and unpretentious with mechanical control and a minimum of sensors (in areas with frequent and long power outages, the owners risk being left without heating in winter by choosing a volatile boiler);
• if there is a separate boiler room, it can be taken with an open chamber, or it can be closed for a coaxial chimney, in a separate room it is easier to organize a bundle of a wall-mounted single-circuit boiler + a heating tank for hot water supply;
• if there are problems with pressure in the gas main, a voltage drop in the mains, then look for boilers whose “brains” can withstand it, not all expensive imported models will be able to ensure trouble-free operation in our extreme conditions;
• pay attention to additional functions not only for the boiler, for example, it is very convenient to have a chimney with frost protection, otherwise you will have to manually get rid of terrible icicles on the coaxial pipe or on the roof near the chimney, which will stop the boiler;
• remember that the boiler will be only a part of the heating system, not only it is important, but also the optimally coordinated and correct operation of all components;
• think over the maximum protection against gas leakage, do not save on safety, relying only on the brand or the reliability of modern electronics.

One of the signs of a malfunctioning gas boiler is an increase in condensate on the windows.

The best wall-mounted gas boilers

A budget model of a double-circuit boiler from a well-known Russian manufacturer who has updated product lines. The filling is European, economical, because. The efficiency is about 90 - 92%. Closed chamber with forced removal of combustion products. Ideal for small spaces up to 100 m² as power is only 11 kW. Inside there is a bithermic heat exchanger, soundproofing of the walls, therefore, low noise. Weighs a little, about 28 kg, compact. Access for maintenance is conveniently organized - the front panel and walls are simply removed. Protection against formation of condensate. It is possible to screw on extras: an outside temperature sensor, a room thermostat, etc.

Cons: the design is not the most elegant, low-power for a double-circuit with hot water supply.

This budget technique is a replacement for the legendary model of the previous generation EGIS. The model is suitable for rooms from 150 to 200 m². A 24 kW dual circuit with 2 independent heat exchangers made of different materials: the primary one is made of aluminum, which is very, very controversial, but the DHW heat exchanger is made of copper, which, of course, pleases. The efficiency is about 93%. There are some handy automations for comfort. The economy mode is thought over: summer, summer/winter. This allows you not to drive heating in the summer, but to turn on only the hot water circuit. There is a condensate collector.

Cons: the aluminum heat exchanger is short-lived, a small flow tank.

Double-circuit 20 kW boiler with separate heat exchangers for each circuit from a proven Russian brand. A durable filling is thought out: brass hydraulics, copper primary heat exchanger, and stainless steel secondary heat exchanger. High efficiency up to 92% is achieved due to the enlarged closed firebox. You can save money by using the modulation mode with adjustment from 9 to 19 kW, and in the summer you can generally switch to the “Summer” mode in order to receive only hot water without heating. Weight and dimensions are small. Good design. Build quality. For rooms up to 150 - 180 m².

Cons: expensive and noisy compared to imported counterparts.

Powerful double-circuit wall mount 24 kW. Efficiency is almost 93%. Economical due to power regulation and "Summer" mode. Electronic control, high-quality assembly. Plate heat exchangers, which is a definite plus for durability. One is copper, the other is stainless steel. The Italian brand has created a worthy product. Suitable for rooms up to 200 m². Provides accurate setpoint temperatures for domestic hot water and heating. Has many levels of protection. It is possible to connect a warm floor and an external remote control.

Cons: for some reason, a pressure gauge for controlling water pressure is located on the bottom of the case, on its lower plane, a small tank, not enough hot water.

German heavyweight 36 kg with anti-corrosion coating and 2 circuits. 2 separate heat exchangers: copper and stainless steel. There is a "Summer" mode, power control depending on the street temperature. Efficiency is about 90%. Closed furnace, turbocharging. Its 24 kW is enough for a house up to 200 m². Despite the fact that this is a budget line, it is also distinguished by stable German quality and reliability.

Enough budget model from a German brand. There are 2 circuits with a copper and stainless steel heat exchanger. A power of 12 kW is enough for a house or apartment up to 100 m². Electronic control, economical. High efficiency up to 92%. Closed combustion chamber. It is possible to install an external temperature sensor.

Cons: the whole series has a problem with the “brains”, it often gives an AE error, there is no protection against condensate, it can turn off in severe frost because of this, the assembly may turn out to be Polish or Russian.

German in origin, but Russian in assembly. A 24 kW wall-mounted double-circuit heater will heat a house up to 200 m². Separate heat exchangers. Easily accessible copper plate heat exchanger. Electronic "brains" help to comfortably manage and save, but they also cause problems. Average weight - 34 kg. Not the noisiest, rather quiet. Safe. For extreme conditions in Russia: low pressure, voltage drops, frost.

Cons: frequent 6A error due to a defective board, an unreliable all-plastic cold water make-up tap, expensive components.

A powerful 24 kW dual circuit is suitable for rooms up to 200 m². Controlled from the remote control. Lightweight and compact. Korean assembly, budget model from a proven brand from South Korea. The efficiency is about 90%. Electronic control, power adjustment, save gas. Bithermic heat exchanger. A very popular boiler among the people, most of them work without serious breakdowns.

Cons: very noisy, can buzz, click, make pops when ignited, often turns on / off, not all owners are lucky with reliability, heats water very poorly, does not pull on hot water.

Another inexpensive two-circuit from a brand from Slovakia, but Turkish assembly. Its 24 kW is suitable for houses up to 200 m². Closed furnace. Separate heat exchangers: primary copper and secondary stainless steel. Mechanical control. Doesn't make much noise. There is a smooth power adjustment. The efficiency is high - almost 93%. Good degree of protection. Lots of services, parts available.

Cons: crooked assembly, 1 heating circuit is turned off when working on hot water, which is very inconvenient in severe frosts, inconvenient wheel control.

24 kW reliable 2-circuit from one of the best German manufacturers for houses up to 200 m². Design with 2 separate heat exchangers: copper primary and stainless steel secondary plate. Water tank 9 l, quite a lot. Closed combustion chamber. Lightweight and compact. Power modulation from 30 to 100%. Efficiency up to 93%. The model is transformed into a single-circuit device by simple manipulations with the second heat exchanger. The boiler has many duplicating degrees of protection, the automation is reliable, there are no failures in it. But the "brains" as a whole are not capricious, tk. the boiler is adapted to Russian conditions, but there are failures. It is thought out for the comfort of maintenance, it is convenient to crawl everywhere. According to the owners, the German-assembled boiler is indeed one of the most reliable and comfortable in everyday life, but there are more negative reviews about the Turkish assembly.

Cons: noisy, may give errors that are not relevant, inconvenient for providing hot water for a large family.

• Only professionals can install the heating system. The safety and reliability of a gas-fired system is more important than perceived savings.
• It is necessary to observe the maintenance of the gas boiler and chimney in a timely manner, if the instructions are bad, then you can find maintenance tips and a video demonstrating maintenance on the network.
• It is important to choose not only the boiler that is optimal in terms of power, but to properly arrange the chimney so that the entire system works efficiently and without failures, chimney problems reduce the efficiency of the heating system and the durability of the boiler.
• Do not install a computer UPS on gas boilers.
• If the water is hard, then be sure to equip the inlet to the house with a filter to soften the water, this will extend the life of the heat exchanger.
• The manufacturer's warranty is valid only if several requirements are met: the first commissioning by the service center specialists, the provision of the UPS boiler, repair only by licensed craftsmen.

quality wall-mounted double-circuit gas boilers found in several manufacturers.

By brand reputation and technical characteristics, you can make rating the most profitable models.

Wall-mounted gas boilers are easy to install and have optimal power.

What is the feature of double-circuit wall-mounted gas boilers

Two tasks that perform double-circuit wall-mounted gas boilers: providing premises with heating and supplying them with hot water.

During the operation of the unit, the gas burns out and heats the heat exchanger, which transfers energy to the coolant, which is distributed through radiators and taps.

Wall-mounted models of dual-circuit devices have several advantages:

• Optimal power.
• Minimum installation space.
• Affordable price.

Unlike floor-standing appliances, wall-mounted ones can be installed on the territory of a heated room (for example, in a kitchen), and not in a separate one, like most floor-mounted ones. But wall-mounted double-circuit boilers also have minuses. These include:

• Power restrictions.
• Limit by type of installed items.
• Need for preparation walls for mounting.

​

The more powerful the boiler, the larger it is. And the wall version should not be too heavy.

it one of the reasons, according to which cast-iron heat exchangers are avoided in wall models. They are made from a different material.

To hold firmly several tens of kilograms required to be securely attached to the wall.

Options

The place gas units occupy in the list is influenced by their parameters, or rather, a whole range of characteristics. Device power: the best option 24 kW, responsible for adequate heating about 82 °C, as well as the presence of hot water in the tap - up to 60 °C.

Gas consumption: an average of 2.8 cubic meters. m of natural or 2 kg of liquefied gas per hour, shows the cost of heat supply. In addition to the heating function, the reliability of the gas boiler is of great importance. Electrically dependent and autonomous devices must be equipped with a security system.

Attention! In some cases, for electrically dependent units, due to the high sensitivity of the sensors of the security system, it is necessary to use Surge Protectors.

Elements of the security system usually solve problems such as: gas control, automatic diagnostics, overheating protection, frost protection, and pump blocking.

These parameters affect the efficiency and reliability of the boiler, as they increase its productivity, reduce the risk of accidents, increase service life.

​

They are important to take into account because they help to keep the equipment working, eliminate the threat to human health and save on fuel.

For example, by choosing boilers with adjustable power when buying, you can adjust the operating mode of the device depending on the weather on the street and the presence of a person in the room, and not operate the boiler at full capacity around the clock, wasting excess gas in vain.

Rating of the best models in terms of reliability

In the process of choosing an option for a private house, it is worth considering unit efficiency. According to him, double-circuit gas wall-mounted boilers are arranged in the following order.

Immergas Eolo STAR 24 3

Italian-made device provides power, equal to 24 kW. This is enough to on an area of ​​200 sq. m. The heating worked efficiently and there was always hot water in the taps.

The unit has a closed combustion chamber, which, in turn, involves the installation of a coaxial chimney. This is the most efficient and safe way to operate the oxygen supply and combustion products removal.

If we add that the device uses a copper heat exchanger, which is considered the best option for heat transfer, then it is not surprising high efficiency - 93.4%. Fuel consumption reaches 2.7 cu. m. per hour, and the performance of the DHW circuit - 13.5 liters per minute at 25 °C. Allows the use of liquefied gas.

Bosh Gaz 6000W WBN

A convection-type boiler from Germany, but assembled in Russia, can provide power for about 37.4 kW. It is specially adapted for Russian conditions and takes into account the local climate. The heating area with this unit can reach 300 sq. m.

Photo 1. Wall-mounted gas boiler model Gaz 6000 W WBN, double-circuit, with LCD display, manufacturer - Bosch.

The device has a closed combustion chamber, a coaxial chimney and a copper heat exchanger. Efficiency is gaining 93.2%. Fuel consumed 2.8 cu. m. on natural and 2 kg per hour on liquefied gas. At a temperature 30°C the performance of the device in the DHW circuit is 11.4 liters per minute.

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Baxi Nuvola-3 Comfort 240 Fi

The unit is made in Italy and is considered a premium device. The upper limit of its power is 24.40 kW. The dimensions of the room in which the boiler is able to operate efficiently may exceed 200 sq. m.

The device performs its functions using a closed combustion chamber. The supply of oxygen and the removal of combustion products are provided by a coaxial type chimney.

Efficiency of a gas boiler one of the highest — 92.9% .

The reason for such a high efficiency can be called a well-thought-out design, in which copper and steel heat exchangers are used, the use of natural (2.78 cubic meters per hour) and liquefied (2.04 kg per hour) gas.

Hot water circuit performance characteristics - 14 liters per minute at 25°C. The boiler can operate in the "Summer" mode.

Buderax Logamax U042

German wall-mounted gas unit, assembled in Turkey, provides power 24 kW, which allows you to heat the area in 240 sq. m. The device uses a closed combustion chamber, a coaxial chimney, a copper heat exchanger.

Efficiency corresponds 92% . Fuel consumption reaches 2.72 cu. m of natural and 1.93 kg of liquefied gas per hour. In the DHW circuit, the flow rate is 14 liters per minute at 25°C.

Buderax Logamax U072 12 K

This model is designed for power 12 kW and is able to provide heat for the area in 120 sq. m.

The closed combustion chamber of the gas boiler and the coaxial chimney guarantee safe operation of the device for the surrounding area.

Its design provides for the use of copper and steel heat exchangers.

Efficiency is gaining 92%. DHW circuit capacity at temperature 25°C is 10.3 l. The device allows the use of the economy mode "Summer". The operating status of the unit is displayed on the LCD.

Buderax Logamax U072 24K

Such a boiler consumes more power, but is also designed for heating a room with an area of 240 sq. m. It also uses a closed combustion chamber, coaxial chimney, copper and steel heat exchangers.

The efficiency is 92%. The performance of the DHW circuit is equal to 13.6 l at 25 °C and there is a "Summer" mode. As in the previous model, the system allows settings for the use of liquefied gas.

Photo 2. Wall-mounted gas boiler model Logamax UO72, power 18000 W, manufacturer - Buderax, Germany.

Baxi Fourtech 24

The device is made in Italy. Its maximum power is 24 kW which is suitable for area heating over 200 sq. m. This option differs from the previous open combustion chamber, which requires the organization of a chimney, as well as ventilation for oxygen supply.

For such a device, it is better to equip a separate boiler room. Its efficiency is 91.2%. Natural gas consumption reaches 2.78 cu. m. hour, and liquefied - 2.04 kg per hour. The model uses copper and steel heat exchangers.

Photo 3. Wall-mounted gas boiler model Fourtech 24, double-circuit, open combustion chamber, manufacturer - Baxi, Italy.

The capacity of the hot water circuit is 13.7 liters per hour at 25°C.

Baxi Main 5 24 F

The Italian boiler is designed for 24 kW. This power allows you to heat over 200 sq. m. territory. The combustion chamber of the device is closed, which implies the use of a coaxial type of chimney.

The unit can run on natural and allows the use of liquefied gas. Its efficiency is 90.6%.

Both heat exchangers in the device - copper. DHW circuit capacity — 13.7 l at 25 °C. The boiler has electronic protection against scale formation.

Navien Deluxe 24K

Produced by South Korea. The unit can use both natural and liquefied gas as fuel.

The power limit of the device reaches 24 kW, which makes it possible to provide heating 240 sq. m. of premises. The boiler uses a closed type combustion chamber, which provides for a coaxial chimney.

Both heat exchangers in this model are made of stainless steel, which is highly wear resistant. DHW circuit performance - 13.8 l at 25 °C. The gas boiler system provides an economical mode "Summer".

Protherm Cheetah 23 MOV

The Slovak unit operates on natural as well as liquefied gas. The useful power of the device is 23.30 kW, which allows you to effectively heat the area in 230 sq. m. efficiency - 90.3% .

The boiler uses both copper (primary) and steel (secondary) heat exchangers. The design provides for an open combustion chamber, which involves the organization of a chimney and ventilation in the room.

The capacity of the hot water circuit is 11 l at 25 °C. The model has an economical mode "Summer".

Useful video

Check out the video, which explains how to choose the right wall-mounted gas boiler.

How to choose a suitable boiler for heating a private house

The presented models take into account the requirements for gas units. Almost all devices have electronic control system which makes it easier to track their work.

In addition, the well-thought-out design of the devices from the list guarantees high safety, which is very important for wall-mounted models, which are often installed inside the house.

Although the list suggests the most efficient models in operation, the choice of the appropriate device depends on the specific characteristics: area, heat loss, operating options.

Nevertheless, you can try to choose the most versatile and reliable type of gas boiler.

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