Hot water supply and high air temperature in the room are a guarantee for a comfortable stay in it. Providing such amenities at the expense of city services has long been not profitable, and it is inconvenient - the temperature is either low or high, perhaps even a complete shutdown in the cold. In this case, it will be relevant to buy the best gas boiler for the home, which is able to replace both a solid fuel boiler and a boiler in one "person". Our rating of the most efficient equipment will help you choose the right option for large and small spaces.

The best gas boilers for home - which company to buy

Of the proven companies, the French company De Dietric stands out and a number of German companies - Wolf, Vaillant, Buderus, Viessman. Italian companies (Baxi, Ferroli, Fondital, Ariston) operate in a lower price category. The not so long ago established brand from South Korea - Navien, is gaining momentum. In the budget segment, Eastern European manufacturers from Slovakia and the Czech Republic are leading - Protherm, Dakon, Atmos, Viadrus. Let's highlight the best manufacturers in each niche:

1. Bosch- the German group of companies produces the most reliable and ergonomic gas boilers. All products comply with international quality standards.
2. Lemax Is a Russian manufacturer that keeps up with world leaders.
3. De Dietrich- founded in the 17th century, produces a wide range of elite class heating equipment.
4. Wolf- guarantees German quality and reliability of the devices. Since 1991, the company has focused on the development and production of heating equipment. The entire cycle from design to production is implemented within one plant.
5. Baxi- opened in 1924, holds a leading position in the development of wall gas heaters.
6. Navien- founded in 1978, offers high-tech European production in Asia at reasonable prices.
7. Protherm- has been working in the field of production of heating equipment since 1991. It is a Slovak company that is part of the Vaillant group of companies. They produce economy-class vehicles using German technologies.

Rating of the best gas boilers for home

The rating was compiled on the basis of a multivariate analysis of gas heating equipment on the market. The technique was compared in terms of the volume of heated premises. Here's what was taken into account when selecting candidates:

• User reviews;
• Functionality;
• Versatility;
• Brand;
• Ease of use;
• Simplicity of service and installation;
• Reliability;
• Lifetime;
• Price;
• Duration of the guarantee;
• Appearance;
• Safe to use.

The best gas boilers for home

Such equipment is of two types - single and double-circuit. The first is created to increase the air temperature in the room, and the second - for the same, plus additional heating of tap water. According to the type of installation, it is customary to divide them into floor and wall ones, the latter are relevant in small rooms where you need to save space. They are made of cast iron or steel. There are models with a built-in boiler. The minimum allowable power is 10 kW, and the maximum is 45 kW.

The best gas boiler in terms of price-quality ratio

- a double-circuit gas convection boiler was developed taking into account the operation in Russian conditions. Consumers quickly appreciated the advantages of the model: small size, high performance, ease of installation and control. The useful quality of this boiler lies in the fact that it easily tolerates voltage drops in the network and gas pressure. Its performance will remain unchanged from 165 to 240 V and from 10.5 to 16 bar. The same goes for weather conditions. In strong winds, Bosch Gaz 6000 W WBN 6000-12 will operate in a powerful mode. In calm, windless weather, it will automatically switch to economy mode. The wall-mounted arrangement and compactness make it possible to use the boiler in houses and small apartments.

Advantages:

• Efficiency 93%;
• Modulated fan;
• Two modes - Comfort and Eco;
• Copper heat exchanger;
• Electronic control;
• Connection of external regulators;
• Low noise level.

Disadvantages:

• Not found.

Customers also noted a well-thought-out security system. Bosch is at its best here, too.

Best single-circuit gas boiler

- a boiler for heating in systems with forced or natural water circulation. The non-volatile gas boiler stands out favorably among analogues with a service life. This was achieved thanks to the high-quality steel from which the combustion chamber is made. Another technological find of manufacturers is the heat exchanger coating. It uses heat-insulating enamel treated with an inhibiting compound.

Advantages:

• Heating area up to 125 sq. meters;
• Protection system against overheating, interruption of traction, soot formation, blowing out of the boiler;
• Gas control;
• Improved turbulator design for better waste gas retention;
• Serviceability thanks to removable elements.

Disadvantages:

• Big sizes.

Despite the reliability of Lemax Premium-12.5, buyers considered the model to be insufficiently equipped with spare parts.

The most economical gas boiler for home

Is a dual circuit heater made in South Korea. It has a built-in expansion tank, a pump for water circulation is included. Thanks to a thermal power of 9-24 kW, the working area is up to 240 sq. m. It operates on two types of gases - natural and liquefied. Remote control from the console is offered. Safe use is ensured by a closed combustion chamber. The heater is equipped with two nozzles for connecting the pipe / outlet of processed products and for charging air.

Advantages:

• Relatively inexpensive;
• It weighs a little;
• Minimum dimensions;
• The presence of a Russified remote control, starting with the minimum configuration;
• Controlled from the remote control, including electric ignition;
• The combustion chamber is closed.

Disadvantages:

• Insufficient water pressure when it is heated;
• Manual regulation of the pressure inside the boiler.

The most reliable wall-mounted boiler

Wolf CCG-1K-24- double-circuit heater of convection type of German quality. The combustion chamber is isolated, and the smoke is removed automatically. It operates at a power from 9.4 to 24 kW, with standard ceilings the heated area is up to 240 sq. m. Allows the use of the remote control. Components are provided by leading manufacturers. The set includes a circulation pump - Grundfos, valve regulator - SIT, improved electronic control system depending on weather conditions. Appropriate sensors allow monitoring the temperature indoors and outdoors.

Advantages:

• Decent quality;
• Stable work;
• 2 year warranty;
• It is very easy to install;
• High efficiency;
• Temperature control over a wide range.

Disadvantages:

• High price;
• Separate heating of water;
• Expensive spare parts and components.

Wolf CCG-1K-24 is most often chosen for rooms with limited space.

The most versatile boiler

Baxi SLIM 2300 Fi- a convection double-circuit heater with a built-in 60-liter floor-standing boiler from an Italian manufacturer of heating equipment. The combustion chamber is closed, and the power is 17-33 kW. The area of ​​the heated premises with standard ceilings does not exceed 300 sq. m. There is a cast iron heat exchanger and an electronic self-diagnosis system. A separate circuit is provided for connecting a "warm" water floor with an independent temperature controller.

Advantages:

• Large built-in boiler;
• Beautiful design;
• Multilevel overheating protection system;
• Works at a reduced gas pressure level;
• Automatic shutdown.

Disadvantages:

• High price;
• Large weight;
• Sensitive to voltage surges.

Baxi SLIM 2300 Fi is a versatile model that allows you to save on the purchase of a boiler or gas water heater.

The best floor standing gas boiler for a small home

Protherm Bear 20 KLOM- a model of a condensation single-circuit type of Slovak production with an open combustion system. Maximum power - 17 kW. Able to heat no more than 160 sq. m, the power is regulated by a burner. For convenience, there is an electronic system of protection, settings and self-diagnostics. The water is heated by a connected boiler. Automatic exhaust of combustion products and forced ventilation are available.

Advantages:

• Reliability of work;
• Easy to operate and maintain;
• Easy to connect;
• Electric ignition;
• Not very heavy.

Disadvantages:

• Does not heat water by itself;
• The combustion chamber is open;
• There is no circulation pump included.

Which gas boiler to buy for the home

You need to buy a gas boiler for specific tasks and conditions of its use. For simple maintenance of the room temperature, single-circuit models will suffice. If it is also required to heat water, then either double-circuit modifications are needed, or with the possibility of connecting a boiler. For large and medium-sized rooms, floor variations are best, and wall-mounted equipment will fit into small rooms.

It would be logical to draw a line taking into account the heated area:

• In houses, cottages and small apartments the two-circuit Bosch Gaz 6000 W WBN 6000-12C will successfully cope with heating and hot water supply.
• For large rooms, from 100 sq. m fit Navien Deluxe 24K, Wolf CCG-1K-24, Buderus Logano G234 WS-38. These models are powerful enough and can work without interruptions throughout the day.
• For medium-sized houses, from 50 to 100 sq. m it is worth choosing Protherm Bear 20 Klom and Wolf FNG-10. Such equipment is sold at an average price and time-tested.
• For small houses, up to 50 sq. m. the offers of Baxi ECO-4s 10F and AOGV-6 are relevant. They have high efficiency and operate in several modes - "warm floors", "hot water supply", "heating".

The repair specialist tells in detail about the criteria for choosing a gas boiler in this video:

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A gas double-circuit boiler is a great alternative if you do not want to be connected to centralized heating. Such a device can be installed both in a city apartment and in a private house and use the advantages of its operation all year round. Our rating of the best models of double-circuit boilers will help you make the right choice.

Recently, it is the double-circuit heating boilers that have become relevant: they can simultaneously heat the building, supplying it with warm water. There are two coils in the design of the model, each of them is responsible for its own function. To answer the question which wall-mounted gas boilers are better, consider the main criteria for the selection of devices:

1. Combustion chamber type... Among the products you can find models with an open and a closed combustion chamber. The open type is used for buildings with a large area, as it takes air from the room. The closed type is suitable for apartments and country houses where a chimney arrangement is not required.
2. Power... It is calculated based on the area of ​​space, the height of the ceilings, the number of windows. The more ways of heat loss, the more powerful the boiler is needed.
3. Performance... The more hot water intake points are present in the house, the higher the boiler performance should be.
4. Manufacturer... There are a number of models of domestic and foreign production on the market that have equal quality indicators. Better to give preference to proven brands.
5. Service and warranty... When choosing a boiler, it is worth considering the risk of breakdown and the possibility of purchasing spare parts in the region of residence.

Expert advice

Mikhail Voronov

Specialist in the field of household appliances, electronics, construction tools, goods for cars, sports and recreation, beauty and health.

The most popular modern models can be viewed in our rating with a brief overview of the characteristics.

Rating of double-circuit wall-mounted gas boilers

The model from the Leberg brand opens our selection of the best wall-mounted gas boilers. This appliance is a 20 kW convection boiler. The design provides for a closed combustion chamber, a built-in circulation pump, and an electronic control panel. The device also has a built-in expansion tank with a volume of 6 liters.

The maximum pressure for the heating circuit is 3 bar, while the maximum pressure for DHW is 6 bar. Of the functions, this boiler is equipped with flame modulation, auto-ignition, pressure gauge and thermometer. The user can be confident in their safety thanks to the gas monitoring function, freeze prevention and pump blockage protection. The Leberg Flamme 24 ASD is a wall-mounted boiler, good in quality and performance, suitable for the home.

• Simplicity of design and management;
• Reliability;
• The presence of all the necessary protective functions;
• The ability to adjust the power.

• Not found.

Gennady, 52 years old

This boiler was installed to replace the old one, which has worked for 15 years. I have never regretted this device. Firstly, it is of domestic production, reliable, and the quality of the iron is at its best. Secondly, it perfectly fulfills the declared functions: I heat a two-story private house, it also heats the water perfectly.

The seventh position of our hit parade for the best gas boilers is taken by a model from by Navien. This is a two-circuit unit with a maximum heating power of 13 kW. The device allows you to heat a room up to 130 square meters. The design contains auto-ignition and flame modulation. The combustion chamber is also closed here, which ensures the safety of the user.

Important! Modern boilers are equipped with a special function that turns off the installation at the time of an emergency.

An expansion tank with a volume of 6 liters is built into the device, the weight of the boiler is relatively small - 28 kg. The chimney diameter is 100 mm, the unit is equipped with frost protection. The manufacturer claims that the buyer will be able to use hot water even with low gas pressure. In addition, in the event of power outages in the boiler, a special chip is triggered, ensuring that there are no breakdowns in the future.

• Availability;
• Economical gas consumption;
• Quiet work;
• The set includes a remote control panel.

• Slight turn-on delays.

Maria, 38 years old

Last year, for the first time, they abandoned centralized heating and installed their own double-circuit boiler Navien. The device heats an area of ​​80 square meters, while hot water goes without problems. I like that there is a remote control with which we can set programs for work.

On the sixth line of our rating is the gas wall-mounted boiler from the Mora-Top company. This is a convection model with a power of 23 kW, on the front panel of which the most necessary levers are located: adjusting the temperature of water and heating. There is also a small display showing the necessary information.

Hinged gas boiler Meteor Plus PK24KT is a convenient and practical solution for a private house. A closed chamber, flame modulation, the presence of a circulation pump - all this helps to ensure safety during operation. The expansion tank has a volume of 6 liters, and the maximum productivity at a water temperature of 35 degrees is 9.4 liters of water per minute. The boiler operates on a single-phase mains voltage.

• Economical gas consumption;
• Electronic control on the display;
• Autodiagnostics;
• High level of efficiency - 90%.

• Great weight.

Maxim, 36 years old

I bought this model for one simple reason - because of the low gas consumption. The device works only with grounding, therefore it is safe to use. Ease of use also won me over - you set the temperature on the display, and everything works. The boiler is easy to maintain - you unscrew a couple of bolts from the side, and the panels are removed.

The next one in our top of wall-mounted double-circuit gas boilers is a device from the company Oasis. The maximum heating power of this model is 18 kW. The design has an auto-ignition, as well as an undoubted bonus - the ability to connect underfloor heating. This unit is capable of heating up to 180 sq.m.

Advice! When installing a gas boiler, the hot water intake points must be located in the immediate vicinity.

The Oasis convection boiler is electronically controlled and has a closed combustion chamber. The mains voltage must be single-phase. The operating temperature range varies between 30-80 degrees.

• Attractive appearance;
• Freeze protection;
• Fast and high-quality water heating.

• Lack of remote control.

Anna, 30 years old

My husband and I moved to a country house where there was no heating at all. We installed this boiler and immediately appreciated its advantages. It heats a large area of ​​the room and is also very easy to maintain. When a problem arose, the husband opened the panel himself and fixed everything.

On the fourth meta of the top of the best gas double-circuit wall-mounted boilers, there is a representative of the Lemax company - the best domestic-made heating and hot water supply device. Do not in vain assume that the Russian manufacturer offers low-quality products: Lemax is a combination of modern safety requirements with German and Italian developments.

High efficiency is achieved due to a closed combustion chamber and a coaxial chimney with a turbine. According to the overview of this device, it is equipped with two independent circuits based on brass coils. The power range is 11-32 kW, which makes the model efficient. The boiler is compatible with a wide range of modern thermostats and control systems, which is beneficial for maintenance.

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• High thermal conductivity;
• Strength;
• Corrosion resistant;
• Compactness;
• Large heating area - up to 300 sq.m.

• High cost compared to similar models.

Evgeniy, 45 years old

I installed this particular boiler of Russian production, because, according to reviews, it is the best in its segment. I am satisfied that all the necessary information is displayed on the display, and even a pensioner can master simple operation - this is how I taught my dad to use the device when we are not at home.

The device from manufacturer Baxi. This boiler is a combination of Italian quality and maximum efficiency at a reasonable cost. A distinctive feature of the device is a removable digital panel, which is also a temperature sensor in the room. This feature allows the owner of the boiler to determine where the control panel will be located.

In terms of reliability, this unit surpasses all expectations: 60-liter boiler, LCD display, stainless steel dividers, as well as smooth electronic ignition. The unit can be reconfigured to work with liquefied gas, which is also convenient for different living conditions.

• Brass hydrogroup;
• Rich functionality;
• Possibility of programming;
• Control on buttons;
• Premium boiler.

• High price

Vladimir, 49 years old

Despite the high price of this device, I still decided not to skimp on safety and quality. The boiler has been heating my house for three years now, it is very quiet, and also shuts down when an emergency occurs. The boiler allows you to set the exact temperature, which is very convenient when a large family lives in the house.

Numerous reviews about gas boilers allowed us to place a model from the Ariston brand on the second line. Stylish appearance - white body is combined with a silver electronic control panel. Buyers are also attracted by the affordable cost and basic features without unnecessary bells and whistles. This device is suitable for use in rooms up to 220 sq. M.

Gas boilers Is the best solution for gasified premises. The main advantages of using gas boilers: they are easy to operate and maintain, compact, suitable for heating a private house and non-residential premises.

Technical characteristics and types of gas boilers

When choosing a gas heating boiler, one should take into account its main characteristics: type of combustion chamber, number of circuits, type of installation.

According to the installation method, gas heating boilers are:

• floor-standing: such boilers are characterized by high power, long-term operation, but it is recommended to allocate a separate room for them;
• wall-mounted (mounted): they are lightweight, compact, their cost is much lower than the price of floor-standing ones.

Today, both single-circuit gas boilers, which provide only heating, and double-circuit ones, are equally popular. The functions of the latter include both heating and water heating. It is the boilers with two circuits that are most often purchased for home and summer cottages.

The following boiler models are distinguished by the type of combustion chamber.

1. With an open combustion chamber - oxygen in this case is consumed from the room in which the equipment is installed.
2. With a closed combustion chamber (or a turbocharged gas boiler) - receives oxygen from the street. Such models have several advantages:

• easy installation and operation;
• high efficiency;
• security;
• the need to use a simple coaxial chimney with a small diameter.

Where to buy a gas boiler?

In the Teplomatika company you can buy online gas boilers wholesale and retail. Our qualified employees will carry out the installation and connection of heating gas systems. We are selling products of the highest quality at affordable prices.

You can order a gas boiler in several ways - by sending the product to the basket or making a purchase in one click. All information about the terms of delivery is contained in a separate one.

Double-circuit gas boilers are a convenient way to solve the issue of heating and supplying a private house with hot water. They are easy to use, have the highest efficiency and reliability, the main thing is to choose a boiler that is suitable for its characteristics.

The functionality of double-circuit boilers is due to the peculiarities of their design. They are equipped with two heat exchange circuits, one of which heats a closed heating system, the other - water for household needs.

Heating of the coolant in the primary circuit is carried out in the gas combustion chamber. The water for the DHW system is heated by the hot coolant from the primary circuit only when you open the tap with warm water. At the same time, a valve built into the boiler shuts off the supply of heat carrier to the heating system.

The longer the hot water tap is open, the more the heating system cools down. Therefore, if the demand for hot water is high, the purchase of a double-circuit boiler is impractical, in this case it is better to choose a single-circuit boiler, and to it

Selection by types and parameters

Double-circuit gas boilers are presented on the market with a huge variety of models, and it is sometimes difficult to understand which one is better to choose. Therefore, in order to make the right choice, you must clearly understand the characteristics you need.

These include:

• power, that is, the ability to effectively heat the required area and heat a sufficient amount of water;
• boiler installation method - hinged (wall-mounted) or floor-standing;
• type of combustion chamber, it can be open or closed;
• the principle of operation is convection, requiring, or condensation, allowing the use of a coaxial chimney;
• degree of automation, type of ignition and the presence of protective functions;
• the manufacturer and the degree of confidence in him.

Parameters such as power and principle of operation depend on the thermal characteristics of the building and its area. Otherwise, the choice of the buyer is usually determined by his stylistic preferences and taste, needs and the price of equipment.

Power

It depends on this parameter whether the boiler is really capable of heating the house for a long time, efficiently and without overloads. A full-fledged heat engineering calculation, which is performed by service specialists, must take into account all the structural features:

• wall material and degree of thermal insulation;
• number and total area of ​​windows;
• ceiling height;
• the presence of complex elements - bay windows, glazed heated terraces, greenhouses.

It is rather difficult to perform such a calculation on your own, therefore, an easier method is usually used. It is enough to calculate the total area of ​​the heated premises, and then apply the formula:

P = S 100/1000.

where P is the required power, kW;

S - area in meters.

For a detached house with insufficient insulation, this figure is increased by 15% in temperate latitudes and by 30% in the northern regions.

So, for an apartment with an area of ​​120 square meters, the nominal boiler power is 12 kW, but for a private house built in the Moscow region, it is better to choose a power of at least 15 kW, and for a colder region - 20 kW. This will allow the boiler to work without overloading.

You should also pay attention to the performance of the DHW circuit. To calculate the consumption of hot water, you need to know the number of tap points in a private house and the likelihood of their simultaneous operation. In this case, a flow rate of 400 liters per hour (6.6 liters per minute) is taken for each point. If two or more points are included at the same time, this indicator must be increased by the estimated number of times.

The total boiler power, sufficient for heating a private house and providing it with hot water, is the sum of the heating system power and the heat exchanger power for hot water supply.

Wall-mounted or floor-mounted?

The installation method of the boiler depends on its capacity.: models designed for heating a private house with an area of ​​up to 200-250 square meters are usually produced in a wall-mounted version. They are compact and do not exceed in size, they can be placed in any convenient place, for example, in the kitchen or bathroom.

Such boilers are designed for a hot water capacity of no more than 14 liters per minute and can simultaneously provide two points of draw-off. To reduce losses, it is recommended to install them close to hot water consumers.

Boilers with a total output of more than 20 kW are usually floor standing. Their dimensions and weight are superior to wall-mounted models, and it is better to place them in a boiler room equipped with a supply and exhaust ventilation system. The requirements for a particular model depend not only on the size, but also on the principle of operation and the type of combustion chamber.

Combustion chamber - which one is better?

Gas boilers can be equipped with an open or closed combustion chamber. They differ in the way air is supplied to the combustion zone. In an open chamber, air is sucked in from the volume of the room in which the boiler is installed.

Therefore, they can only be installed in a boiler room equipped with a window or fresh air ventilation, otherwise the air in the room will become unsuitable for breathing. In addition, to ensure stable traction and complete removal of flue gases for such a boiler, it is required with the height of the vertical part not less than that specified in the passport.

A closed combustion chamber allows you to install the boiler in any room of the house. To supply air and remove exhaust gases, in this case, a coaxial chimney is used, consisting of two corrosion-resistant pipes located one in the other. Flue gases escape through the inner pipe, and fresh air taken from the street enters through the space between the pipes.

In this case, fresh air is recovered (heated), which has a positive effect on the combustion process. The coaxial chimney can be led out horizontally through the wall. In this case, the draft is provided by a built-in fan. Wall-mounted models usually have a closed combustion chamber, so they can be used not only for heating a house, but also in apartments.

Principle of operation

According to the principle of heat removal, gas boilers can be convection and condensing. The difference lies in the fact that in the convection heat carrier the heat carrier is heated in the combustion chamber, and in the condensation one additionally uses the heat obtained during the condensation of steam.

The advantage of the condensing boiler is its high efficiency- up to 96%. But his minus - strict requirements for the design of the heating system: the temperature of the return water entering the heat exchanger should not exceed certain values, usually 60 ° C, which requires a professional calculation and adjustment of the system and large expensive radiators.

The implementation of the convection heating principle is possible in boilers with any combustion chamber. Condensing boilers always have a closed combustion chamber.

Volatility, degree of automation and type of ignition

The simplest models of gas boilers do not require an electrical connection. Their functionality, as a rule, is not high - they have an open combustion chamber, require connection to a vertical full-fledged chimney, and their start-up is carried out only manually.

Modern models of gas boilers are connected to the mains, they are equipped with automation that allows them to work completely autonomous, without human intervention.

Two parameters important for usability:

• number of heating steps;
• type of ignition.

The heating stages are the modes in which the boiler can operate in order to provide the set heating parameters.

The cheapest models are single-stage. In them, the heating process alternates with the standby mode. Upon reaching the preset temperature, the boiler stops the combustion mode, heating will start again only after the coolant has cooled down to the lower permissible value. This can lead to uneven heating.

With two- and three-stage heating, the boiler automatically selects the combustion intensity depending on the set temperature, so that the coolant does not overheat, and the room temperature remains stable. The price for such models is slightly higher.

Ignition type in gas boilers sometimes manual- using a piezoelectric element, or electronic- in models equipped with a control unit. Piezo ignition after shutdown requires a manual start, the electronic one turns on itself after a power outage or elimination of the emergency operation of the boiler.

Other convenient functions built into the gas boiler help to make it completely safe to work. Almost all modern boiler models are equipped with them. These functions include control of flame, draft, gas supply and other modes of combustion and heating system.

You can find out by the codes that are displayed on the display of the electronic control unit, some models also allow you to connect a GSM notification system via SMS.

Famous brands and manufacturers

It is not entirely correct to focus only on the equipment manufacturer, since most companies have a wide range of models with very different functions. But buying gas equipment from an unknown manufacturer, even with a high-quality assembly, carries a number of risks. That's why when choosing a manufacturer, you should pay attention to the following nuances:

• warranty period and period of use of equipment;
• the location of service centers where you can make repairs or maintenance;
• the ability to buy or order spare parts and consumables;

Natural gas is the cheapest energy source in Russia, so most people opt for gas heating. Heat and hot water can be obtained with a gas boiler. On sale you can find a huge number of all kinds of modifications of such equipment. Some of them are suitable for heating an apartment, while others are ideal for heating a large private house. Let's try to figure out which gas boiler is better for heating different types of premises.

Which gas boiler is better to choose depends on many factors: the weather conditions of the region, the heated area, the type of housing (apartment or private house), etc. The main criteria by which the best boiler is determined are:

• power;
• number of contours;
• type of attachment;
• the nature of the circulation of the coolant;
• combustion chamber type;
• type of heat sources.

Let's consider what criteria the best gas unit should meet.

What should be the capacity of a gas boiler?

To heat rooms of different sizes, units of a certain capacity are required. The required performance is calculated on the basis of the rule - 1 kW is needed to heat 10 m². If you want to receive hot water, then the power reserve is increased by 20-30%. Also, the indicator of optimal performance may vary depending on weather conditions, the thermal insulation of the house and the availability of additional systems.

The performance of a gas boiler depends on the operation of the gas burner. They may be:

• one-stage;
• two-stage;
• modulating.

Single-stage are capable of supporting fire in only one mode. Gas boilers equipped with such burners are not economical, but they are inexpensive. To save fuel and pay less for it, you should opt for a unit with a two-stage or even better - with a modulating burner. The first option has two levels of work power, and the second has several performance steps (from 5 to 10). Modulating or multi-stage burners increase the boiler efficiency and significantly save gas.

Which is better - a single-circuit or double-circuit boiler?

Single-circuit gas boilers are intended for heating only. Double-circuit units are capable of generating heat and hot water. However, the volume of heated liquid produced by boilers with two circuits is often not enough. If you need a lot of water for showering and bathing, you will have to buy an indirect heating boiler. It can be connected to both a double-circuit and a single-circuit unit. The second option is cheaper than the first. In addition, the boiler system with a single-circuit unit is more reliable and durable.

It is impossible to say unequivocally which gas boiler is better for heating - single-circuit or double-circuit. It all depends on the need for hot water and the personal preferences of the consumer.

Mount type

By the type of attachment, gas boilers are divided into:

• wall-mounted;
• floor.

Wall-mounted gas units are compact in size, but their power rarely exceeds 35 kW. Thus, the most powerful wall-mounted boilers are capable of heating only a room with an area of ​​up to 320 m². But they easily fit into any interior and can be hung even in a small kitchen or bathroom.

Floor-standing gas boilers are large, so you will have to look for a suitable place for them, and for models with an open combustion chamber - a separate room. Stationary units are more expensive, but they can also heat larger areas than wall-mounted counterparts.

Which is better - a floor-standing gas heating boiler or a wall-mounted one, is determined depending on the type of living space. To heat an apartment, especially a small area, a compact wall-mounted unit will be enough. To heat a large private house or industrial premises, the best option is a floor-standing gas boiler.

Natural or forced circulation of the coolant

Gas boilers differ in the type of coolant circulation. It can be natural or forced. In the first case, the coolant moves in the heating system due to the pressure that is formed in it at a certain location of the boiler, radiators and expansion tank. This option is non-volatile and ideal for regions with frequent power outages. Such units are equipped with an atmospheric burner, so they can only be placed in a separate room with good ventilation.

In gas boilers with forced circulation, the coolant moves due to a pump that runs on electricity. In such units, turbocharged gas burners are often used, which do not require a furnace device. Their efficiency is much higher than that of non-volatile systems. The disadvantage of boilers with forced circulation of the coolant is that if the electricity is turned off, they will not be able to heat the room.

If in the settlement where you live, the electricity is rarely turned off, then it is better to purchase a device with forced circulation of the coolant. If the electricity is turned off often, then the best option is a system with the natural movement of the coolant.

Features of open and closed combustion chambers

Gas boilers can be equipped with open or closed combustion chambers. Units of the first group are called atmospheric - a separate room is required for their installation, since with this type of combustion chamber, the burner uses air from the environment and flue gases also enter the room in which the unit is located. Open chamber boilers require the installation of a traditional vertical chimney to allow the smoke to escape outside. The efficiency of atmospheric devices is low and amounts to 76-85%.

Gas boilers with a closed combustion chamber are also called turbocharged. They do not require a separate boiler room and a classic chimney device. To remove the combustion products, it is sufficient to install a coaxial type pipe with an outlet through the wall. The turbocharged models can be placed in the hallway, closet, kitchen or bathroom. They take air for combustion not from the room, but from the street through a coaxial chimney and have a high efficiency = 88-95%.

Many are lost in choosing which gas boiler is better for heating a house - atmospheric or turbocharged. If you are purchasing such a unit for the first time, then it is better to opt for a device with a closed combustion chamber, since it consumes fuel more economically and you do not need to spend money on a boiler room and a full-fledged smoke exhaust system.

If the boiler is bought to replace the old atmospheric unit in an already equipped furnace, equipped with a chimney, then it will be more profitable to purchase a similar model.

Note! There are two options in which it is possible to use only one type of combustion chamber. First, in the case of installing a non-volatile system, only a device with an open camera is suitable. Second, only a turbocharged gas boiler can be used to heat the apartment.

What is the difference between convection boilers and condensing boilers?

By the type of heat sources, gas boilers are either convection (conventional) or condensing. The former use only the energy obtained from the combustion of the gas. The latter, in addition to the traditional source, receive heat from condensate, which is collected on a heat exchanger.

Convection gas boilers are cheaper, more versatile and easier to operate. Condensing units are distinguished by high efficiency = 96-99%, significantly save fuel, but also cost an order of magnitude more expensive.

Note! Condensing units are capable of operating with maximum economy only at a heating medium temperature of 50-60ºC.

Which manufacturer of gas boilers is the best?

In the process of choosing, the consumer has the question of which manufacturer produces the best gas boilers for heating. Reviews and ratings show that the most reliable and durable units are those produced by the German companies Vaillant, Viessmann, Buderus. They are also leaders in the production of gas condensing boilers. Vaillant and Viessmann produce a record number of condensing units and are constantly improving their technology. However, the cost of German heating devices is quite high, as is the cost of repairing them. Therefore, the bulk of consumers prefer gas heating boilers from Italian or Czech companies. For example, devices of the brands Baxi, Ariston, Protherm, Thermona are cheaper than their German counterparts, and in terms of quality they are almost not inferior to them.

Also popular are gas boilers of domestic manufacturers Neva Lux, Lemax, Borinsky, KONORD. Of course, they are somewhat inferior to foreign models in terms of assembly quality and the number of additional functions, but Russian-made units are affordable, unpretentious to the quality of fuel and water, and are also resistant to voltage drops. In addition, it is easier to find components for domestic products and their repair will be cheaper.

The best batteries for a gas heating system

The gas heating system has features that give rise to certain requirements for radiators:

• low working pressure of the coolant;
• the presence of a closed loop, due to which pressure drops and water shocks are excluded in the system;
• use of high-quality coolant.

What heating batteries are better for a gas boiler? Bimetallic and cast iron must be excluded immediately. They are good for a centralized system, but not for a gas system - cast iron heats up for too long and this significantly reduces the efficiency of the boiler, and the use of bimetallic radiators in this case is economically impractical. Thus, only aluminum batteries remain. They are considered the best for a gas heating system, but when choosing and installing, one should take into account the operational subtleties.

The disadvantages of aluminum radiators include:

• fear of water hammer;
• susceptibility to corrosion.

But in the gas system, both of these problems are easily solved: the presence of the first is simply excluded, and the second is solved by installing a filter at the inlet of tap water to the boiler.

The advantages of aluminum batteries perfectly combine them with a gas unit:

• able to quickly heat up and cool down;
• do not require a large volume of coolant;
• weigh little;
• easy to install.

It is important to correctly calculate the required number of radiators. To do this, you should pay attention to the heat transfer of one section. It is considered that 100 watts of energy is required to heat 1 m². To compensate for certain heat losses, another 10-15% of the obtained indicator is added.

To exclude corrosive processes, it is necessary to connect the boiler and radiators using plastic pipes. When installing a heating system, it should be borne in mind that aluminum is capable of releasing hydrogen gas - this occurs when the metal reacts with oxygen-saturated water. Therefore, do not forget about the installation of a Mayevsky crane to remove excess gas.

As for the choice of the manufacturer of aluminum radiators, the quality of the products of Russian companies is in no way inferior to foreign ones, but they are much cheaper.