TOP 15 best single-circuit gas boilers: Rating 2021-2022 and which wall-mounted or floor-standing model to choose for heating a private home

Before the start of the winter season, many new owners of private houses are thinking about which boiler to choose in order to keep the house warm and cozy in cold weather.

For many owners of country houses that are heated with gas, the solution to this issue lies only in choosing a boiler that uses gas as the main type of fuel.

The purchased equipment must comply with the following principles:

• productivity;
• efficiency;
• reliability;
• safety.

Cast iron gas boilers correspond to these characteristics, both according to the conclusions of experts and according to statements from buyers.

Rating of the TOP 15 best single-circuit gas boilers for a private home for 2021-2022

How to choose power for a room and calculation formula

The power of gas boilers is selected based on the area of ​​the premises. The simplest formula is that 1 kW of boiler power is taken into account per 10 m2 of area.

This technique is most effective for rooms with a height of no more than 3 m . If the ceilings are higher, it is necessary to slightly reduce the ratio of the size and power of the unit.

For double-circuit boilers, the power should be increased by 20% to compensate for losses in water heating.

TOP 3 best single-circuit gas boilers with indirect heating boiler

Buderus Logamax U072-24 24 kW

A reliable and functional gas boiler is designed for wall mounting.
The design of the device is specially adapted for operation in the Russian climate.

The boiler itself perfectly withstands unstable pressure in the gas main and voltage fluctuations in the electrical network, while simultaneously providing stable heating of the room.

Additionally, the device has a simple and intuitive control system using an electronic panel with a display. With its help, the user can configure basic performance indicators by pressing a few buttons.

Another advantage of the device is that when an independent boiler is connected, the boiler can also be used for hot water supply, and its power is sufficient for high-quality heating of rooms up to 250 square meters.

The heat exchanger is made of copper, is resistant to corrosion and heats up well. The combustion chamber is a closed type, so this model is suitable not only for private houses, but also for apartments in high-rise buildings.

Specifications:

• thermal power: 7.20 - 24 kW;
• combustion chamber type: closed;
• installation: wall;
• dimensions (WxHxD): 400x700x299 mm;
• circulation pump: built-in;
• expansion tank: built-in;
• control: electronic.

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pros

completely safe to use due to gas control and a reliable safety valve;

there is protection against overheating and freezing;

adequate cost;

stylish attractive design;

excellent build quality.

Minuses

if the boiler fails, repairs will be expensive;

imperfect firmware causes failures in electronic control.

BAXI ECO Four 1.24 24 kW

The wall-mounted gas boiler is designed for installation in domestic and industrial premises with an area of ​​up to 240 square meters.
An indirect heating boiler can be connected to the device, so this model is suitable not only for heating, but also for organizing hot water supply.

The design of the device involves connection to a main pipeline with natural gas, but, if necessary, it can be converted to liquefied gas, but for this the user will have to separately purchase a set of nozzles.

The device has two heat exchangers: a primary one made of copper and a secondary one made of stainless steel. Both materials are resistant to corrosion and ensure stable temperature maintenance at the user-specified level.

The device is also equipped with all the necessary functions for safe operation: protection against overheating and freezing, gas control and automatic fault diagnosis.

Specifications:

• thermal power: 9.30 - 24 kW;
• combustion chamber type: open;
• installation: wall;
• dimensions (WxHxD): 400x730x299 mm;
• circulation pump: built-in;
• expansion tank: built-in;
• control: electronic.

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pros

intuitive electronic control panel;

can operate on different types of fuel (natural and liquefied gas);

affordable cost;

works relatively quietly;

Compact dimensions make installation easy.

Minuses

The kit does not include jets for liquefied gas;

Many users complain of a loud knocking noise when igniting.

BAXI SLIM 1.400 iN

A distinctive feature of this boiler is that, despite the floor installation, it has very compact dimensions.
Thanks to this, the device is perfect for heating large residential and industrial premises, but does not take up much space.

The device has a reliable and wear-resistant cast iron heat exchanger.

The combustion chamber is open type, so the device can only be used in private homes.

Since this type of combustion chamber involves connection to a chimney, installation of the device should only be carried out by a specialist.

In terms of control, users have no complaints about the boiler. At the top of the case (front) there is a convenient electronic panel.

It is covered with a translucent lid, and several buttons and two rotary controls allow you to quickly set the necessary heating parameters. Installing the boiler involves installing a smoke hood, but it is not included in the kit, so the user will have to buy it separately.

Specifications:

• thermal power: 20.60 - 40 kW;
• combustion chamber type: open;
• installation: floor;
• dimensions (WxHxD): 350x850x635 mm;
• control: electronic;
• functions: self-diagnosis, frost protection, flame modulation, heating floor connection, pump blocking protection, power-on indication, auto-ignition, overheating protection.

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pros

durable and high-quality cast iron heat exchanger;

convenient electronic control panel with display;

high thermal power allows the device to be used for heating large rooms;

can operate on different types of gas (natural and liquefied);

There is automatic fault diagnosis.

Minuses

no built-in expansion tank;

impressive weight.

Which coolant is better for a cast iron heat exchanger - water or antifreeze?

Cast iron does not react with antifreeze, so it can be used as a coolant in a heat exchanger along with water. However, the following features of this liquid should be taken into account:

1. Antifreeze is denser than water, so it will take longer to heat up, and therefore more fuel. If we add here the time for warming up the heat exchanger itself, then it can take from 10 to 25 minutes before heat is supplied to the room.
2. Non-freezing liquid takes a long time to heat up, but it also gives off heat longer compared to water.

Based on the properties of antifreeze, we can conclude that it is not suitable for constant operation of a gas unit, but only if the device is turned on periodically. If continuous heating is required, it is better to use water.

What is a single-circuit heating boiler?

A single-circuit heating boiler is equipment with a built-in heat exchanger, designed for stable heating of non-residential and residential premises of any size.

The design is compact, has good efficiency and is easy to maintain, which is explained by the design features of the unit.

A high degree of automation allows the device to be used in various modes.

This means that the user will be able to independently configure the parameters - quickly, conveniently and very simply.

Which wall-mounted gas boiler is better to choose?

It is impossible for the fundamental criterion in choosing a wall-mounted gas boiler to be its cost. To ensure that your home is always warm and cozy, subject to minimal financial costs, you need to familiarize yourself with other criteria for choosing heating equipment.

So, first you need to decide what kind of gas boiler you need:

1. Convection boilers have a low cost due to their simple operation scheme. To heat the room, only fuel combustion energy is used. Convection boilers are characterized by an efficiency factor of 90%. The remaining 10% “fly” down the drain. Gas combustion products that leave the house have a temperature of about 200 degrees.
2. The condensing boiler has significant structural differences in comparison with its counterpart. The price for such models is higher. Advantage - boilers emit more heat than is released during fuel combustion. The efficiency of high-quality models can reach 100-110%.

Next, you should pay attention to the following factors:

• Closed or open combustion chamber. When choosing a wall-mounted boiler of any of these types, you must first take care of organizing ventilation. Models equipped with an open combustion chamber require a constant flow of air to burn natural gas. Gas boilers with a closed combustion chamber force air through the pipe using a fan.
• Heat exchanger material. The heat exchanger is perhaps one of the most important components of any boiler. This component is a metal container in which the coolant is heated. They are made from steel, cast iron, copper.
• Single- or double-circuit wall-mounted gas boiler. For a comfortable stay in a private house, it is important not only to heat it, but also to provide all household members with hot water for domestic needs. Of course, you can purchase a water heating tank separately, but there is a simpler solution to the problem - a double-circuit boiler. Such models are equipped with two heat exchangers, which are connected to two mains: one is responsible for heating the house, the second for hot water supply.
• One or two stage boilers. In this case we are talking about the power of gas equipment. It is recommended to purchase two-stage boilers in regions with harsh winters; in warm regions there is no need for it. Unless there are only freezing people living in the house.

The market offers a large selection of wall-mounted gas boilers for heating private homes. They all have different power, design features, design and cost. As practice shows, they are not very suitable for heating houses with large areas.

Distinctive features

Floor-standing cast iron gas boilers, unlike steel units, have a prefabricated sectional design. It is worth noting that the units are assembled only by hand.

Features of cast iron heat exchangers:

1. Cast iron, once heated, retains and releases thermal energy for a very long time. This material also resists aggressive environments and acids well.
2. Since the design of the cast iron heat exchanger is prefabricated and it consists of separate sections, in case of any damage, all parts can be replaced individually.
3. The heat exchanger is not afraid of high temperatures and can withstand heating up to 300°C.
4. The service life is quite long - 25 years or more.

Cast iron heat exchangers can be found in both domestic and industrial boilers.

You can read about the types of heat exchangers for gas boilers here.

conclusions

If you need to purchase a single-circuit heating boiler, you should listen to the recommendations of specialists and remember that:

• When choosing equipment, you need to decide in advance which device is more suitable: condensing, gas, combined, solid fuel or electric;
• the basic criteria for choosing a unit are indicators of maximum thermal power, coolant temperature and expansion tank capacity;
• Particular attention should be paid to the fuel used, type of control and design dimensions.

Customer Reviews

Oleg D.

Lemax Premium-30N, 30 kW, single-circuit

For a private home, the choice is good: for this price we get both decent assembly and good power. This Lemax series has no special bells and whistles, just a good boiler without unnecessary electronics. The protection works when the gas workers on the main were working, it turned off normally, and the gas was turned off. In my opinion, this is the most important thing for a gas boiler; there is no need to joke with gas. I wanted to get a cast iron one, but I couldn’t afford it. I decided to believe the reviews and took a steel Lemax. Well, what can I say - it worked for three years without a hint of leakage. I have enough power to spare, my house is always warm. I took the boiler to put it at the dacha, where we visit with the child all year round, incl. The dacha has an area of ​​120 square meters, and we needed it to be really warm everywhere, after all, we are traveling with a child and spending the night. Well, I was specifically looking for a reliable option, because after all, it’s a dacha, outside the city, and we often leave leaving the boiler to work, they said that Lemax is perfect for such cases (when reliability is important) (and there really are no problems!). I was pleasantly pleased with the price, I thought I would have to pay more for this. Well, and convenient, of course, where without it, and the kit includes a clear instruction manual in the passport. It’s really not difficult to deal with it) So far there have been no failures, there’s not even anything to scold about.

Valentin Ya.

Lemax Patriot-12.5, single-circuit

Assembled with high quality. As installed a year and a half ago, it did not cause any problems. The design is simple but reliable - no fancy electronics, it works without being connected to an outlet. The ignition is well done. Warms up quickly. But last winter it was a little cold, I saved in vain - I should have added Lemax’s “Patriot 20” to the same one, it would have been warmer with it. 12.5 kilowatts is still not for my area, and the walls don’t have proper thermal insulation. It's a shame, the boiler itself is excellent.

Anton Ashurkov

Buderus Logamax U072-18, 18 kW, single-circuit

When I moved to a new house, I started looking for a good gas boiler. I wanted it installed before the cold weather. The installers took me to this model. Before buying, I decided to look at reviews about this model on one review site. It seems that people advised everything. Yes, the boiler had some minor flaws, but this was not fatal. The manufacturing company is the German concert Bosch. And for me, everything is German, it immediately refers to quality and durability. Just out of curiosity, I read the history of the brand. Now about the boiler itself. There were no problems with the installation. The boiler itself is white, attractive, and equipped with a special panel. It is with the help of this panel that the control is carried out. My house is big. The boiler completely copes with heating my mansion. When it’s severely cold outside, naturally, you have to set the temperature higher. If it gets warmer, you can do less. After the old model, the new boiler, for me, works almost silently. So far during operation, I haven’t found anything to complain about. Everyone at home is warm. In case of any malfunction, the boiler is equipped with various protections and interlocks. It’s scary, nothing will happen for sure. I recommend.

Pavel Alexeev

BAXI ECO-4s 1.24F, 24 kW

People! Don't take 2 contour lines! Take a single-circuit unit (like this one) plus an indirect heating tank plus a three-way valve. Yes, you will overpay about 17 thousand rubles, but you will have a normal system with hot water of the same temperature, you will be able to circulate hot water and your boiler will not switch to hot water every time you need to wash a mug. A bonus is the absence of scale, since the water inside does not leave the heating/heating circuit. And don’t buy condensers unless you know EXACTLY what you need. Update. A year of work - everything is fine.

Volodya Z.

Lemax Leader-25, 25 kW

I have a two-story house with an area of ​​185 sq.m. There is enough space in the house, but to heat it, we needed a powerful and efficient boiler. After searching on the Internet, I liked the Lemax Leader-25 floor-standing boiler, designed for heating areas up to 250 sq.m and with a modern security system. I took it with a reserve, in case we decide to finish building something. The boiler has been working for me for the first heating season, and so far it has shown its best side. It warms up the house quickly, and when you start it up two hours later, you can feel the living spirit in the house. The panel has a temperature regulator, which makes it easier to select the appropriate thermal mode.

Evgeniy S.

Gas boiler Lemax Patriot-12.5, single-circuit

Lemax Patriot-12.5 installed in a three-room apartment. I am completely satisfied with the operation of the boiler. It does an excellent job of heating the apartment, it works completely silently, you need to listen to understand when it started, the external appearance of the boiler is compact and of a modern design. This is an excellent option for apartments that are not equipped with chimneys. The boiler has served me for two years and so far I have not found any flaws in it.

Maxim K.

Buderus Logamax U072-24

Advantages: The boiler is designed very simply, which makes it quite reliable. I understand both its operating principle, indicated in the instructions, and the controls. Perfectly suited to a 150l indirect boiler and a 200m2 heating system. Disadvantages: Structurally, it is not designed for a sudden power outage. Like many others. When the power is cut off at the very peak of heating of the indirect heater, for example, an overheating error of the heat exchanger appears, because the boiler no longer circulates water, and the heat exchanger remains very hot.. After turning on the power, an overheating error appears and the boiler will not turn on until you reset it manually.. That is, if you left for several days and your power was turned off, you you can return to a cold house with a boiler stopped by an error.. Comment: In general, this is what my project needed. The boiler copes with its tasks perfectly. Heating a 200m2 house with heated floors, an air heater and heating water in a 150l indirect heating tank. By the way, it heats this volume of water from +9° to the calculated +55° in about 15 minutes. That is, from a completely icy state. I connected an indirect boiler to the boiler. By the way, who doesn’t know, a simple NTC 10kOhm thermistor, which costs 50 rubles on a well-known Chinese website, can serve as a boiler temperature sensor for the Buderus Logamax U072-24 boiler. The sensor is sold with wiring, and the boiler already has a connector for it. The boiler perfectly sees the current temperature of the water in the boiler and controls its heating.

Gennady Dick

Buderus Logamax U072-18, 18 kW, single-circuit

This brand of boiler was recommended to us by the gas workers who gasified our house. They also calculated that for a house whose total area does not exceed 120 sq.m. The power of this boiler is enough even with a reserve. Therefore, we tried to buy a boiler before all installation work was completed, so that it would be immediately connected to the heating circuit. There were no special problems connecting the boiler, except that we had to install an additional 3/4″ adapter, since our heating circuit was routed with inch pipes. They hung it on the wall using the standard hooks that came with the kit. The gas was connected by specialists, they also checked the gas control protection and gave us a brief instruction on how to use the system. There is nothing particularly difficult about operating the boiler. I set the required temperature on the remote control using buttons, and the automation will monitor everything else. The latter, by the way, is quite strict about compliance with safety regulations. A couple of times she signaled to us that we needed to clean the chimney, where foreign objects had gotten into. And it works very stably. It was always warm in the house, even when the frost outside reached -35 degrees.

Alexey K.

Lemax Leader-25, 25 kW

I'm surprised that the material is cast iron, which lasts forever, and costs the same or even less than some with a steel heat exchanger. I took Lemax precisely with the expectation that I would get more at a lower price. Turned it on, turned it off - and all the trouble. Installed in a separate room, away from living rooms. It does not make noise, does not require settings - everything is automatic. The cast iron heat exchanger will outlive me. But without the circulation pump the coolant barely moved, with the pump it was ok, but that’s the only way electricity is consumed.

Dmitry Sirenko

Buderus Logamax U072-18, 18 kW, single-circuit

For a small private house, what was required, first of all, was a reliable gas boiler that could reliably perform its main function throughout its entire service life, and maybe longer. Before this we had a Chinese-made boiler, which we had a lot of trouble with. We didn’t want to step on the same rake again and again, so this time we chose a boiler from a well-known German brand. Since all our communications were already connected and the boiler was hung in the place of the old one, there were no special problems with the connection. Moreover, the boiler is not very heavy and compact in size. The controls are simple and intuitive. You can quickly figure out the settings without even reading the instructions. Although I still advise you to read the instructions for the first time, they are written in clear Russian. After reading it, you will definitely have no more questions. The boiler has a copper heat exchanger and a relatively small storage tank, but at the same time it reaches the temperature set on the control unit relatively quickly. This winter we also experienced frosts of 20 degrees, but even at that time we did not freeze at all, despite the fact that the temperature on the control unit was above 60 degrees. were not exhibited.

Sergei Brodsky

Buderus Logamax U072-24, 24 kW, single-circuit

We installed this boiler in conjunction with an indirect heating tank. In the service parameters (L.2; 2.4E) the value was set to “2”, i.e. “single-circuit boiler + indirect heating tank”, however, after just 2 weeks of operation, the setting spontaneously reset and switched to “1”, i.e. “double-circuit boiler”. All other settings, oddly enough, have not changed. I don’t know what the control board saw there, what connections were there, but the boiler is single-circuit + tank. As a result, the hot water supply disappeared early in the morning, and with it the whole day of nervous study of those. documentation and the Internet in attempts to understand what happened to it, since there were no errors on the display. It’s good that I came across the correct information, otherwise I was already planning to disassemble and clean the three-way valve, and blow out the sensors...