How to choose a gas boiler for heating a private house. Power factors for different regions of Russia

Most homeowners choose a gas boiler over an electric or solid fuel one. This is due to the availability of this energy resource. The main advantages should also be added high thermal power, good efficiency, low emissions into the atmosphere and the ability to heat a building with a large area of ​​150-300 sq.m.

What the market offers

There are several types of gas boilers for heating a private house. They can be classified according to several criteria. First of all, there are 2 categories of equipment:

• single-circuit boilers - have only one working circuit, which is designed to work on the heating system;
• double-circuit models - have 2 functioning circuits and are able to heat water both for heating the room and for providing it with hot water supply.

The devices are available in condensing and converter types, they differ in the presence of a burner in the chamber. Also, the equipment is divided into classes according to the type of installation, so the following variations can be found on the market:

• wall boilers heating;
• outdoor devices.

Regardless of the type of unit, it has an identical design, which consists of:

• corps;
• burners;
• outlet element;
• control units;
• circular pump;
• heat exchanger;
• work control devices.

The principle of operation already depends on the type of technology. But in any case, the gas boiler is considered the most productive of the entire line of similar units.

For those who do not save usable space in the house and can afford to allocate space for the overall heating equipment, the best option is a floor-standing gas unit. In list best models turned out to be the following:

Baxi Slim 1.490 iN

The Baxi single-circuit gas boiler from a well-known Italian manufacturer stands out among competitors with a high efficiency of up to 90%, which is 3-5% more than its counterparts. The unit is designed to heat a large building with a total area of ​​​​up to 365 sq.m, this is a definite plus. Working power gas boiler Baksi is 48.7 kW.

Baxi Slim 1.490 iN

The design has only one circuit, so the model works only for space heating. It has an open combustion chamber and an electronic control system. The floor-standing single-phase device runs on natural gas or liquefied gas, while consuming 5.7 m3 / h. first or 4.2 kg / h. second.

The maximum pressure level of a natural fuel resource should not go beyond 5-20 Mbar, liquefied - 30 Mbar. Heating gas equipment can warm up the coolant to a temperature of 30-85 ° C.

Additional functions are: self-diagnosis, protection against pump blocking, overheating, freezing, gas control. Separately, it should be noted the possibility of connecting an external control, as well as a warm floor. The unit weighs 174 kg, its dimensions are 350x1490x715 mm, and the price is 70,000 rubles.

The Protherm gas boiler has a standard set of options that are sufficient to perform the intended functions. This compact version, which has relatively small dimensions of 880x330 mm. A single-circuit unit generates a thermal power of 12-17 kW at a thermal load of 13.5-19 kW.

The design provides for an open combustion chamber and an electronic control system. The primary heat exchanger consists of cast iron material. Up to 2 m3 is consumed per hour natural gas, and its maximum allowable pressure is 13-20 Mbar.

The device is capable of heating the coolant to a temperature of 45-85°C, the maximum pressure is 4 bar. As additional devices, a thermometer, a screen, a pressure gauge, an automatic ignition system and flame modulation should be distinguished here. As for the safety device, it uses auto-diagnostics of operation, gas control, a system from overheating, freezing. The model weighs 90 kg, it costs 49,100 rubles.

This is a relatively inexpensive gas boiler Lemax convection type. The device is capable of heating a building with an area of ​​up to 250 m3, since it has high level Efficiency - 90%. In the design of the model there is a steel heat exchanger, which actually affects the cost reduction.

In order to avoid problems with the formation of corrosion later, the manufacturer has provided a special coating with an inhibitor.

It has everything you need for safe work- heating controller, thermometer, gas control. There is also an auto ignition system. Separately, it should be noted that this model intended only for open heating system. Price - 27400 rubles.

The reliable Vaillant gas boiler is very popular among homeowners. All this thanks to good technical characteristics. A wall-mounted double-circuit boiler will provide the premises not only with heating, but also with hot water supply.

Vaillant Turbotec Pro VUW 242/5-3

The nominal temperature level of the DHW circuit is 65 ° C - for domestic use this is more than the optimal parameter. 24 kW of power is enough to heat an area up to 240 sq.m. In this mode, the Vailant gas boiler produces the most high performance Efficiency - about 91%.

Separately, it is necessary to highlight the presence of 6 degrees of protection, electronic control with the possibility of modulating fire, as well as a 6-liter expansion tank. The main disadvantages of the device are high cost 48000 rubles. In addition, the inaccessibility of parts should be highlighted. But device breakdowns are extremely rare.

The Italian Ferroli boiler is great for small houses, apartments or country cottages. Its maximum thermal power equal to 7.2 kW, this will be enough to heat three rooms. There is an electronic control system, a frost protection device, an overheating blocking option. The diagnostic module independently monitors the functioning of the unit, and, if necessary, informs the user about problems in the form of error codes.

The Ferroli double-circuit gas boiler has a high KD level of 93.1%. The package includes a closed combustion chamber, circulation pump, expansion tank and flame modulation. Of the additional functions, they note the power indicator, thermometer, auto-ignition, pressure gauge. The price of a wall-mounted boiler is 27,000 rubles.

Double-circuit convection unit with closed camera combustion. Power 24 kW, designed for a heating area of ​​250 sq.m. The case is easily disassembled, which is convenient for regular cleaning during maintenance. Works on liquefied and natural gas. The design provides an ionization electrode and an electronic burner with a flame control function. The efficiency is 92%, designed for single-phase network operation.

There is frost protection, but it only works when the circulation pump is running. That is, the function itself turns on the burner and the pump, which continue to pressurize when the flow temperature drops to +5°C. The model is resistant to voltage drops in the network and pressure, but in any case it is recommended to install a stabilizer. On the outside there is a display where performance indicators and error codes are noted when malfunctions occur.

Convection wall-mounted unit with a closed combustion chamber with a power of 24 kW, designed for heating a room with an area of ​​250-260 sq.m. subject to high-quality insulation (recall, in case of problems with thermal insulation, for each kilowatt of power there is not 10, but 15 sq.m). The package includes a circulation pump and an expansion tank of 8 liters. Designed for single-phase operation.

The design of the case is pleasant, made in white color. There is a control display that displays all performance indicators and error codes when detecting breakdowns or malfunctions. It was conveniently invented to stick a hint on its control on the unit itself. The primary heat exchanger is made of copper. Works on natural and liquefied gas. Consumption, respectively, 2.8 m / h and 2 kg per hour. Performance hot water temperature of 60°C is 6.8 liters per minute. There are problems with the passage of cold water - while taking a shower or bath, the burner turns off for a while and goes cold water. The problem is typical for all Boschites. In general, the unit is silent, does not cause any trouble. Cleaning is recommended once a year or as needed.

Advantages and disadvantages of gas boilers

Gas heating equipment is very popular due to a wide range of advantages. The main ones to be highlighted are:

• profitability - not only in terms of the consumption of a cheap resource, but also a small expense;
• simplicity of the device - all models have standard system controls that even an inexperienced user can handle;
• high efficiency;
• minimal release of harmful substances into the atmosphere.

Disadvantages:

• difficulties with paperwork before installation;
• danger of gas leakage;
• the room where the installation is planned must fully comply with the requirements of Gazgortekhnadzor.

VIDEO: The main design data for choosing a gas boiler

Heating of a private house is being equipped different ways. The traditional oven, used in Russia for more than one century, is gradually losing its position. The electric and gas systems much more relevant today.

In the same time electric heating requires large financial costs, so its installation in large rooms is unprofitable. In this case great solution is an gas heating, in which the main carrier of heat energy is a gas boiler. When passing through a gas main, this type of heating is the least expensive.

In addition, it can be attributed to the safest types of heating.

Heating for a private house

The production of gas boilers provides for several options for equipment. The difference primarily concerns functional features.

There are two types of boilers:

1. Single-circuit.
2. Double-circuit.

1. Single circuit

This type is intended for the heating system. It's pretty compact. Its design provides for the heating of the heat carrier, which circulates in the heating system. It has several connectors with which it is possible to supply hot water.

The water heater in this case is selected taking into account household needs and according to the model of the boiler. At the same time, it is the boiler that maintains the set temperature. An automatic system allows you to regulate this process. In the warm season, the gas boiler is switched to the "summer" mode, the heating function is turned off.

Single-circuit models have a number of advantages that make them more in demand:

1. automatic adjustment allows you to set optimal level heat supply, thanks to which you can save on fuel;
2. single-circuit boilers involve the creation of various schemes of the heating system, with which you can increase power and extend the service life;
3. the design of such devices is quite simple and at the same time quite reliable;
4. installation of a single-circuit model is not particularly difficult.

Their only drawback is the lack of an independent system for supplying hot water. For these purposes, a water heater heat exchanger is connected to the boiler.

2. Dual circuit

The design of this type provides for the presence of two circuits, each of which performs its specific function. One circuit is dedicated directly to heating. The second one performs the function of a water supply system, with its help hot water enters the water supply system.

There are two possible modes:

1. flowing– water is heated during consumption. At this point, the heating circuit is closed without damage to the heating;
2. Boiler– used when the demand for hot water is higher. To do this, a boiler is installed, the boiler heats the water in it to the required temperature. With small volumes of the water heater, this option can be considered more economical.

According to their design features, double-circuit boilers are divided into two types:

1. Biothermal with one heat exchanger, consisting of two tubes located one in one. Inner pipe designed for the passage of water for plumbing, external - for heating;
2. Duothermic with two heat exchangers, each of which has in its design copper tube transferring heat. In this case, one of the heat exchange systems is responsible for heating, the second for heating water in the water supply system. This type of boiler is more economical. But heating is somewhat slower.

Among the advantages that double-circuit gas boilers have, it is worth highlighting the following:

1. This equipment has a protection function in case of power surges.
2. Fast water heating; when used per minute 5-6 liters, the water temperature heats up to 37 degrees.
3. The presence of a sensor to turn off the gas supply in the event that the flame is gone, which ensures the safety of their use.
4. Compactness, while the efficiency of use is quite high.

The disadvantages of double-circuit gas boilers stem precisely from the design features:

1. This type of equipment provides for the supply of hot water in full to only one point. With the simultaneous opening of the tap at one more point, the water temperature drops.
2. Water heating occurs only after cold water flows out of the main pipe.
3. When water is supplied to the water supply, the water supply to the heating system is turned off.
4. Hard water can damage the heat exchanger.

The classification of gas boilers is also carried out according to such a parameter as the output of combustion products.

In this regard, two types of equipment can be distinguished:

1. Traditional.
2. Capacitor.

In the first case, the calorific value of the fuel is considered to be the lowest, and gases and vapors escape into the atmosphere.

Traditional or convection boilers have in their design:

1. modulating burner.
2. Expansion tank.
3. The tank where the condensate is collected.
4. Temperature sensors.

In addition, this equipment provides some additional functions:

1. Self-diagnosis.
2. Protection against scaling, blocking and freezing.

Such models have their advantages:

1. Due to the relatively simple design, the installation of equipment is easy.
2. Low cost.

But it should be noted that the energy in this type of boilers is not fully used.

Capacitor equipment has a much higher efficiency. This is due to the fact that part of the vapors and gases formed during the combustion of the fuel go into the boiler system and condense in the heat exchanger. The resulting heat enters the device.

Thus, among the advantages of this equipment, it is worth noting the following:

1. Fuel economy.
2. High efficiency.
3. Efficiency from 80 to 97%.

But these devices also have disadvantages:

1. higher cost.
2. The complexity of the design.
3. Repair and maintenance of these models require a certain amount of time and money.

Gas boilers also differ in the installation method:

1. Floor.
2. Wall.

Outdoor gas equipment is made of cast iron, rather bulky. For its installation, it is necessary to provide a separate room with an area of ​​about 9 sq.m. But at the same time, their main advantage is high power. It is advisable to use them for large rooms where high heat transfer is required. Durability is another plus of these devices.

Wall-mounted boilers are made of steel, lighter, more compact. At the same time, they are quite resistant to various mechanical damage. They do not require a lot of space to install. This perfect option for heating small spaces. But unlike floor standing, their power is somewhat lower.

The disadvantage of such boilers is a lower service life than that of floor-standing ones. It has to do with the material of manufacture.

One of the advantages is ergonomics and safety.

Boiler selection

Each homeowner, when choosing a boiler, is guided, first of all, by two points - fuel economy and reliable automation. The latter will ensure safety in the event of a shutdown of the central gas supply or any malfunctions in the operation of the device.

But when choosing equipment, it is necessary to take into account other factors that to a large extent affect the quality of heating.

1. House area. Depending on this indicator, the power of the gas boiler is selected. There are three main categories of devices:
   • Boilers up to 65 kW are used for small areas. Most often this wall type equipment.
   • Power up to 1700 kW is applicable for two-story and multi-apartment buildings;
   • Devices with a power of up to 15,000 kW are used only in industrial and industrial premises. It follows that the larger the heated area, the greater the power should be. gas equipment. The following indicator is taken for calculation - 1 kW per 10 sq.m. In double-circuit boilers, this parameter is approximately 30% higher.
2. The placement option is selected based on power. Wall-mounted boilers have less power. Therefore, if the total heated area is a small wall-mounted boiler, it will be an excellent solution not only for heating, but also in terms of design. In larger rooms it is necessary to install more powerful floor devices.
3. The next factor is the purpose of the boiler. If, in addition to heating, it is planned to supply hot water to the water supply system, double-circuit modifications are used. Best Option in this case there will be a boiler with a built-in boiler. Single-circuit models are provided only for the heating system.
4. Of great importance is the type of burner:
   • Atmospheric is designed specifically for the heating system of private houses.
   • Ventilation is mainly used in industrial buildings.
5. Another point to pay attention to is the type of traction. There are two options here:
   • Natural with the obligatory presence of a chimney. The design of such boilers has an open combustion chamber. These models are cheaper, but their efficiency is somewhat lower;
   • The forced exit of combustion products is carried out through a turbine chimney, the main element of which is a fan. In this case, a coaxial pipe can act as a chimney. These models are equipped with a closed firebox. Due to the sufficiently high efficiency, significant savings are achieved.

In addition, when choosing, you should be guided by the following recommendations:

1. Parameter rated power should not be higher than necessary.
2. Burners made of stainless steel will last much longer.
3. Pipelines must be made of stainless steel or bronze.
4. The presence of an automatic control system.
5. Kit automatic protection will ensure safety in any unforeseen situations - lack of traction, gas leakage, disappearance of the flame.
6. In case of existing problems with the heating system, it is better to choose a double-circuit boiler.
7. And, of course, you should be guided when choosing a manufacturer. Today, in this regard, there are several options.

Popular Options

1. Lemax company

The company produces gas boilers of various types - wall-mounted, floor-standing, steel, cast iron and occupies Russian market leading position. Lemax KSG and KSGV devices are in the greatest demand.

This equipment is made of steel and has all the main performance characteristics:

1. High thermal insulation properties heat exchanger.
2. Functionality.
3. Automatic control and protection system.
4. Warranty 14 years.

Devices of the Leader series are made of high-strength cast iron. The service life of this equipment is up to 25 years. It has an excellent protection system. Suitable for both open chambers and closed chambers.

One of the advantages of Lemax boilers is their quite low cost- from 12500 to 20500 rubles.

2. Company Anton

The Ukrainian company Anton has been manufacturing industrial and domestic gas boilers for decades. Produces boilers of various modifications. The most popular models are the classic Atmo boilers, which have the function of heating and hot water supply.

Among the main characteristics, the following should be noted:

1. Open combustion chamber.
2. Fuel economy.
3. Automatic protection system.
4. Operability at low gas pressure.
5. Easy to operate.
6. The surface of the boiler is treated with anti-corrosion material.

Prices for this equipment range from 12,500 to 20,500 rubles.

3. Proterm company

This manufacturer is focused on the production of gas equipment for wall and floor type for private houses. In addition, the company also supplies the main components for boilers. The greatest demand is floor units Bear made of cast iron.

There are quite a few varieties of this product, but they are all connected by common characteristics:

1. Liquid crystal display.
2. Electric ignition.
3. Power from 18 to 49 kW.
4. Power control available.

The cost of this equipment depends on the modification and power and varies from 47,200 to 76,200 rubles.

No less common are the wall-mounted boilers Cheetah of this company.

All manufactured modifications of this series have common features:

1. Liquid crystal display.
2. Steel heat exchanger.
3. Automatic control.
4. Some models do not connect to a chimney.
5. Compactness.

The cost of such boilers ranges from 35,000 to 47,200 rubles.

4. Ariston company

This company for the production of gas equipment is one of the largest. All of its products are of high quality.

The following models are the most popular:

Ariston BS- economical double-circuit wall-mounted boiler. Its power is 25 kW. It has two heat exchangers and an excellent hydraulic system in its design.

Ariston Egis Plus equipped automatic system surge protection. It has two heat exchangers - one of copper, the second of of stainless steel which significantly increases the service life.

Ariston Clas B has in its design a boiler with a volume of 40 liters. This equipment is represented by wall-mounted double-circuit models.

Ariston Clas Evo System quite reliable in operation, durable. Designed for heating both a private house and office buildings.

The Italian quality of all these models is successfully combined with a very reasonable price. The cost of such equipment is affected by the type of device, its power. Taking into account these indicators, prices range from 45,000 to 20,100 rubles.

1. When choosing a gas boiler, it is necessary to consider not only specifications but also the features of the room.
2. Installation of equipment and its operating conditions greatly affect the efficiency of its operation.
3. Single-circuit models equipped with an automatic system can be used for floor heating and ventilation.
4. In the absence of a centralized gas supply, gas cylinders can be used to organize heating.
5. By mounting the boiler with forced draft, the outlet of the combustion products can be installed directly through the wall to the street.

Main gas is the cheapest type of boiler fuel. If the village is gasified, then the owners of cottages often simply do not look towards other options. In this case, gas boilers for heating a private house - optimal solution. They are economical, easy to maintain and reliable. However, you need to choose this equipment wisely. There are many models with different characteristics and manufacturers on the market.

Are you going to buy an efficient gas boiler that can provide heat in the most severe frosts? There are many factors to consider when choosing equipment for your home. What is the best option? What are the most important criteria? Owners of both private houses and apartments have to think about solving this problem.

Agree, it’s a shame to pay twice and end up with an insufficiently functional boiler that can’t heat Vacation home with the onset of cold weather. Therefore, before choosing a gas boiler in a store, you will have to weigh the pros and cons. Otherwise, you can take a far from suitable model.

We will help you determine the main criteria that dramatically affect the choice. Helpful Tips and important nuances are set out in our article. Photo materials and a selection of videos with advice from experienced experts in the field of heat supply are provided to help the homeowner.

Absence or constant interruptions district heating and hot water supply are forcing the owners of cottages and city apartments to create.

Their main element is a boiler, which, by burning fuel, heats the coolant for the heating system and water for domestic needs.

The choice in favor of gas equipment is due to the cost-effectiveness of using gas as a fuel. All other options for combustible fuel are more expensive or give less heat at times.

Plus, modern heaters of this type do not require constant supervision. Connected the unit to main pipe or a cylinder, and it works smoothly as long as there is something to burn.

The use of natural gas is the optimal solution for heating a private house in terms of fuel costs and operating costs.

However, in order for the gas boiler to function properly and in optimal mode, it is necessary to choose it correctly when buying and regularly service it after connection.

There are many different in functionality and special modules within the models of this equipment. The purchase of a gas heating unit should be approached thoughtfully.

There are many criteria for choosing a gas boiler, but the main ones are:

1. The power output by the device.
2. Layout solution (number of circuits, body type and heat exchanger material).
3. Place for installation.
4. Availability of automation for safe operation.

All these questions are closely related. The lack of space for a large unit or the desire to mount a device with an aesthetic appearance in the kitchen forces you to choose a wall-mounted model of less power than floor version. And the need to heat hot water for the washbasin and shower makes you look for a boiler with two circuits.

When choosing a heater, you should remember the need for its repair, if the workshop for after-sales service the selected model is not nearby, it is worth looking for another option

The subtleties of choosing a boiler for heating and hot water

Contemporary thermal equipment has a stylish appearance, filled with all sorts of sensors and can operate in several modes.

Each gas boiler has a burner inside the body and a combustion chamber with a heat exchanger, but there are also models with circulation pump and other modules

First, the gas in the burner is ignited with electronic system or a piezoelectric element. Then, as a result of its combustion in the furnace, water is heated by means of a heat exchanger, which is sent to the heating system circuit.

This is how classic single-loop models work. To prepare hot sanitary water you need to choose or connect a boiler.

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Criterion #1 - material and design of the heat exchanger

The choice of an internal heat exchanger must be approached with special attention. Water moves inside it, and a sufficiently powerful and high-temperature flow of thermal energy acts outside.

On the one hand, the material of its manufacture must be very durable, and on the other, heat-conducting. The more it transfers the heat generated as a result of combustion of the gas, the higher the efficiency of the installation.

Manufacturers equip gas boilers with heat exchangers from:

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

Due to the lack of a predisposition to corrosion from contact with water, the cast iron version is the most durable. But he has a lot of weight. And if used incorrectly, it can burst at the border between areas with very different temperatures. To prevent this, you will have to wash it more often.

Steel heat exchanger is the most common. It is cheaper than cast iron and copper counterparts. Plus, this metal has good ductility, which reduces the likelihood of cracks. However, the steel in the heating circuit quickly corrodes.

Copper is more resistant to corrosion processes and has best performance on heat transfer. The heat exchanger from it has a small weight and compact dimensions. But this option costs a lot of money.

In channel No. 1 of the bithermal heat exchanger, water is heated for heating, and in channel No. 2 - for hot water supply

According to the internal design, the heat exchange coil can be conventional and bithermal. The first involves connecting only one water circulation circuit, and the second two at the same time. Double-circuit boilers are equipped with a pair of conventional heat exchangers or one bithermal. The second option is cheaper.

Criteria #2 - type of unit location

Gas boilers are installed on the floor or hung on the wall. Models of the first type are called outdoor and are characterized by large dimensions. Most often they have cast-iron or steel heat exchangers. These options have best performance in terms of equipment price / power ratio, rather than wall-mounted counterparts.

On the one hand, the closed version has a higher efficiency and does not burn oxygen in the room, but on the other hand, such boilers are more expensive and depend on electricity. Without the latter, the gas heater with electric ignition will also stop working.

If there are problems with the uninterrupted power supply, then it is better to prefer equipment with piezo ignition, which by definition does not require electricity to operate.

Criterion #5 - automation, adjustment and diagnostics

To simplify your life, when choosing a gas boiler, special attention should be paid to it. Manufacturers offer a lot of additional options that greatly facilitate the operation of gas heating equipment.

A remote control with sensors helps to monitor the temperature in the rooms and regulate the operation of the gas boiler, choosing the most optimal mode

Power adjustment can be:

• single-stage;
• two-stage;
• smooth with flame modulation.

The simplest and cheapest option is a single-stage one with one ON / OFF button. The power of the boiler in this case is actually not regulated in any way. The burner in it is either on or off.

Models with two-stage adjustment suggest the presence of a pair of operating modes with different power.

From this point of view, units with a modulator are considered the best gas boilers, which allows you to smoothly adjust the intensity of fuel combustion. Automation, depending on the water consumption and the temperatures set by the owner, independently turns on right amount burners and adjusts their flame height.

To ensure safety, heaters are equipped with:

• sensors for monitoring pressure in the gas pipeline, expansion tank and circuits with pumped water;
• sensors that track the attenuation of the flame;
• self-locking system in case of various emergencies (fires, smoke, power outages);
• pressure relief valves;
• water purification filters;
• overheating thermostats.

All this automation makes it possible to protect the heating equipment from damage in case of emergency situations, as well as to maximize the efficiency of its operation.

The presence of smart automation helps not only maintain comfortable temperatures in the rooms, but also reduce gas consumption

You can set up the boiler so that, in the absence of people in the house, it works in the minimum cost mode, and raises the temperature half an hour before the arrival of the owners room air to more comfortable levels.

What power should the boiler be?

The technical documentation for the gas heater necessarily contains information about the rated power. Before buying equipment is desirable. Often, the manufacturer there also indicates the quadrature of the room that this equipment will be able to heat.

But all this is rather arbitrary, without competent heat engineering calculations for a particular house, you should not choose a gas boiler.

The calculation of the required power is made taking into account the quadrature of the building, the configuration and type of the heating system, climate zone and many other factors

An experienced heating engineer in the calculations should take into account:

• area and cubic capacity of each room;
• climatic conditions of the region of residence;
• quality of insulation of external walls;
• the size and number of windows, as well as the type of double-glazed windows in them;
• the presence of balconies and street doors;
• characteristics of the heating system, etc.

In addition, the quality of the fuel and the gas pressure in the line are taken into account. A separate calculation is made for DHW systems. And only then both figures are summed up and increased by 15-20% in reserve, so that the boiler can cope with both constant and peak loads without problems.

Conclusions and useful video on the topic

Video #1 How to choose the right gas boiler:

Video #2 How to select a gas-type heater, based on the declared power:

Video #3 Which floor boiler is best for a cottage:

It is essentially impossible to give unequivocal advice on which gas boiler to buy is better. The heater for hot water supply and the heating system for each particular dwelling must be selected individually. And this should be done only on the basis of the calculations of a competent heat engineer, taking into account all the nuances.

There are a lot of criteria and subtleties in choosing a boiler. Before going to the store, you should carefully study everything, but it is better to consult with a specialist in this field.