Rating of single-circuit gas boilers: TOP-12 boilers 2022

1. Differences between single-circuit and double-circuit models
2. Advantages of single-circuit gas boilers
3. Reliable single-circuit boiler - several selection rules
4. Rating of single-circuit gas boilers with a closed chamber
5. TOP rating of the best condensing models

Wall-mounted single-circuit gas boilers are a compact mini-boiler room, all of the equipment of which is already located in one building and is ready for use immediately after connecting to the heating circuit and gas networks. Single-circuit models are optimized for space heating, and to prepare hot water it is necessary to additionally install an indirect heating boiler.

The small dimensions of the gas boiler make it possible to install it in any convenient place, the supply of communications to which is carried out taking into account the requirements of regulatory documents. The choice of heated area is limited by the power range of wall-mounted heating devices, the typical value of which is 24 kW. The TOP rating of single-circuit gas boilers, prepared by Teplomatika engineers, will help the untrained user to better navigate the market of equipment for heating private houses.

Differences between single-circuit and double-circuit models

The main difference between single-circuit boilers and their double-circuit counterparts is the absence of a built-in gas water heater, which is responsible for preparing hot water. The design of single-circuit models is much simpler, which has a positive effect on the reliability and durability of the product.

To prepare hot water in a heating circuit with a single-circuit gas boiler, an indirect heating boiler is usually installed, the capacity and dimensions of which depend on the number of water points. The supply of hot water in this scheme is faster, and the additional circulation pump allows you to completely avoid significant pauses between the opening of the hot water tap and its appearance in the mixer.

When purchasing a single-circuit boiler, it is necessary to take into account the additional reserve of its power, which will be needed to prepare hot water. At the same time, in contrast to dual-circuit models, the number of water collection points can be increased, which compares favorably with schemes with one heating circuit and an external indirect heating boiler.

How does price influence choice?

Price is critical. Market conditions matter. People had more money, they invested in something more reliable, when there was less money, there was a crisis, people began to cut corners on everything. They choose what is cheaper. This is the paradox of the market. A person builds a house for at least 20 years, but at the same time does not think in terms of 20 years. The choice is made based on price.

This is a choice not only of boilers, but also of radiators, pipelines, fittings. If there is a crisis, then they put on frankly cheap bullshit. Forgetting that bricked-up pipes will be difficult and expensive to replace. Even if the crisis is already over and there is money.

Spare parts for wall-mounted gas boilers

Before purchasing a boiler, find out the cost and delivery time of spare parts for it. Ask Gorgaz which boilers they service.

You need to heat your home. You agreed with them that they will build your heating system, and most likely, they will also purchase all the materials. Many installers have discounts, and they make a little money by supplying materials, and you save a little.

Most likely, you will ask them the same questions that customers most often ask me:

• Can you tell me which gas boiler to buy for a private home?
• Which pipes are better and why?
• Can you tell me which heating radiators are better?
• How long will delivery of goods and installation take?
• Why so long?
• Why is it so expensive?

What materials do you think installers recommend in 90% of cases? Most installers recommend those materials on which they get the biggest discount!

Advantages of single-circuit gas boilers

Wall-mounted mini-boiler rooms with one heating circuit have a number of significant advantages over floor-mounted single-circuit boilers, the main of which are the following factors:

• factory assembly and configuration of a mini-boiler room reduces the qualification requirements for heating system installers, which is often a decisive factor for remote regions;
• single-circuit models are significantly more reliable than their double-circuit counterparts, a common cause of failure of which is clogging of the secondary flow heat exchanger with dirty water from a water supply or well;
• gas automation completely eliminates leaks of natural or liquefied gas and does not require the installation of additional safety equipment;
• internal control and automation circuits for boiler equipment reduce the owner’s costs for heating an apartment or private house.

Among the disadvantages of single-circuit heating schemes, it is worth noting the additional costs of the home owner for equipment for preparing hot water.

Reliable single-circuit boiler - several selection rules

• the typical power value of single-circuit models (24 kW) allows you to heat houses or apartments with an area of ​​up to 240 m². In this case, it is necessary to provide a power reserve for heating hot water, if such is provided in the heating system;
• devices with an open combustion chamber require the installation of a chimney, the height of which must exceed the highest point of the country house;
• to install heating appliances with a closed combustion chamber, a coaxial chimney is used, the outer opening of which is sufficient to extend beyond the outer wall;
• in heating devices with an open combustion chamber there is no supply fan, which reduces the operating noise of the device and increases the reliability of the heating device;
• single-circuit gas boilers with a closed combustion chamber do not take air from the room and do not require a natural or artificial supply ventilation system for their operation;
• ONLY devices with a closed combustion chamber are suitable for installation in the kitchen, since gas services prohibit the installation of atmospheric heating devices outside the boiler room;
• the main requirement for installing condensing boilers is the installation of a device for collecting and recycling condensate, the discharge of which onto the terrain or into a sewer system is prohibited by environmental regulations;
• the price of wall-mounted single-circuit gas boilers depends on the quality and reliability of the components. Components from China are significantly cheaper than their European counterparts, but their durability is significantly lower.

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.

TOP 5 single-circuit boilers with an open chamber

The rating of devices with an open combustion chamber includes the TOP 5 best gas boilers, which include both devices of the highest price category and budget heating devices.

1. Vaillant atmoTEC plus VU 240/5-5 24 kW - a 24 kW wall-mounted boiler is suitable for heating private houses or apartments up to 240 m². Developed automation and safety systems protect the boiler room from emergency operating conditions, and the reliability and quality of the installed components have been tested over the long-term operation of already installed heating devices.

Models in the line:

Vaillant (Vailant) atmoTEC plus VU 200/5-5 20 kWkW

Vaillant atmoTEC plus VU 240/5-5 24 kW

Vaillant (Vailant) atmoTEC plus VU 280/5-5 art 28 kW

Among the distinctive features of this model, it is worth noting the flame modulation mode of the burner made of chromium-nickel steel, as well as the automatic switching of operating modes of the circulation pump.

Advantages:

• the heating circuit heat exchanger is made of high-quality copper alloy, which eliminates its corrosion even at low-temperature operating conditions;
• intelligent control over the pressure level in the heating circuit increases the safety of the entire system;
• automatic search and detection of errors reduces the time for troubleshooting;
• Programmable partial power mode allows you to save fuel in houses with an area of ​​less than 240 m².

Flaws:

• A rather complex and developed control and diagnostic system, the proper use of which requires a certain amount of knowledge.

Expert opinion: perhaps the best model in its class from a well-known and time-tested manufacturer, the only drawback of which is its price.

2. Baxi ECO Four 1.24 is a single-circuit wall-mounted economy class model with a power of 24 kW from a popular Italian manufacturer, the main advantages of which include excellent price-quality ratio.

An important feature of this model is its high-quality adaptation to Russian gas supply conditions, which maintains the operation of the heating device even when the pressure in the supply line drops to 5 mbar.

Other features of the ECO Four 1.24 include a draft presence sensor at the combustion chamber exit, ionization flame control and built-in weather-compensating automation.

Models in the line:

Baxi (Baxi) ECO Four 1.14 14 kW

Baxi (Baxi) ECO Four 1.14 24 kW

Advantages:

• additional special coating of the copper heat exchanger reliably protects it from corrosion;
• a group for connecting an external indirect heating boiler simplifies the implementation of a hot water preparation circuit;
• high-quality modulation of the burner flame is a serious factor in fuel economy;
• the ability to reconfigure modes to operate on liquefied gas significantly expands the operational capabilities of the product.

Flaws:

• Customer complaints about poor build quality require increased attention from installers during initial installation and commissioning of the product.

Expert opinion: a good model for heating a private home, the minor shortcomings of which are compensated by an excellent price-quality ratio, as well as a wide network of regional service centers.

3. Protherm Panther 25 KOO - an easy-to-use and reliable Slovak-made model that has proven itself well in Russian conditions. Manufactured at the plant of the German Vaillant group, the Panther 25 KOO gas single-circuit boiler with a power of 25 kW is distinguished by the quality of the installed components and high safety standards of the heating device.

Models in the line:

Protherm (Proterm) Panther 25 KOO 25 kW

Protherm Panther 30 KTV 30 kW

The new generation hydraulic block made of composite materials is developed based on the experience of previous operation, which increases its reliability many times over. Also, the automatic air vent installed on the circulation pump meets high standards of reliability and safety.

Advantages:

• the copper heat exchanger of the heating circuit is highly resistant to corrosion and prevents scale deposits on its walls;
• built-in control microprocessor analyzes all operating parameters of the heating device and simplifies fault diagnosis.;
• The display of increased brightness increases the comfort of controlling the operation of the heating system.

Flaws:

• Many customers complain that the sensitivity level of the flue gas sensor is too high, but this fact may also indicate an insufficient level of ventilation in the boiler room.

Expert opinion: there are practically no complaints about the quality and reliability of the Protherm Panther 25 KOO, however, the inflated price tag and expensive after-sales service switch the attention of customers either to products from the Baxi group (good service) or to wall-mounted Vaillant models, which are slightly higher in price.

4. Ariston CLAS X SYSTEM 24 CF NG - a wall-mounted single-circuit boiler with a capacity of 24 kW from a well-known manufacturer from Italy is characterized by extremely low requirements for gas pressure in the supply line, which ensures its operation even at a pressure of 5 mbar.

Models in the line:

Ariston (Ariston) CLAS X SYSTEM 24 CF NG 24 kW

A large and convenient control panel makes it easy to set and adjust the operating parameters of the heating system, and the purchase of an additional set of jets makes it possible to switch the operation of the device to liquefied gas.

Other features of the Ariston CLAS X SYSTEM 24 CF NG include an aluminum alloy heat exchanger and a two-speed circulation pump with automatic speed switching.

Advantages:

• built-in frost protection and circulation pump blocking systems reliably protect the heating system from emergency situations;
• a developed switching system makes it easy to connect external control and automation devices;
• The innovative stainless steel burner increases the durability of the heating device, and the modulation of the burner flame significantly reduces fuel consumption.

Flaws:

• heat exchangers made of aluminum alloy place increased demands on the quality of water for the heating circuit.

Expert opinion: a good and reliable model in the mid-price category, but before purchasing it is worth checking the availability of service organizations in the region of installation.

5. Bosch Gaz 4000 W ZSA 24-2 K - a German Turkish-assembled boiler with a power of 24 kW belongs to the lower price range, however, the single-circuit design of the heating device eliminates the known shortcomings of this company’s bithermal heat exchangers.

Models in the line:

Gas boiler Bosch (Bosch) Gaz 4000 W ZSA 24-2 K art. 7736901490

Built-in draft control in the chimney and ionization flame sensor of the burner significantly increase the safety of the gas group and the overall safety of the heating system. Also, the quality of operation of the heating circuit is well affected by the copper heat exchanger, the main advantages of which include high resistance to corrosion.

Among other features of this model, it is worth noting a three-stage circulation pump, which allows you to adapt the operation of the pump group to the volume of coolant in the heating circuit.

Advantages:

• electronic ignition optimizes the initial period of switching on the heating device;
• built-in protection against overheating and freezing of the heating circuit reliably protects the heating system from emergency operating conditions;
• a convenient and clear LCD display displays the current operating parameters of the device, and also includes an automatic self-diagnosis system.

Flaws:

• Among the shortcomings, some owners note difficulties in connecting this model to utility networks.

Expert opinion: a good boiler in the lower price segment with simple controls and a well-thought-out design for easy replacement of failed components.

Top 3. BAXI ECO-4s 1.24F

Rating (2021): 4.09

18 reviews from resources were taken into account: Yandex.Market, Otzovik, IRecommend

Increased efficiency The boiler efficiency is 93%, which is several percent higher than similar models with similar parameters.

• Characteristics

  Average price: 41,600 rub.

• Country: Italy (produced in Hungary)
• Thermal power (kW): 24
• Heated area (sq.m): 250
• Control type: electronic
• Installation: wall
• Fuel consumption (cubic m/hour): 2.73
• Circuit water pressure (bar): 3

One of the important parameters when choosing a boiler is efficiency. It is calculated using a complex scheme from the ratio of thermal power, pressure created and fuel consumption. On average, this value is 87-90%, which is the norm. But BAXI ECO-4s went further: its efficiency is 93%, and this is the best result among models with similar characteristics. The boiler itself is wall-mounted, with electronic control. It requires a network connection as the burner is controlled by smart electronics. The tank is completely copper, which is why we see such a not very attractive price tag. But it will last for many years and will not develop fistulas that require repair or replacement.

Advantages and disadvantages

• Full copper tank
• Smart Electronics Control
• Best efficiency

• Expensive device

Rating of single-circuit gas boilers with a closed chamber

The TOP 5 rating of single-circuit models with a closed combustion chamber includes the most popular models from well-known manufacturers, the main requirement for whose products is increased reliability of heating devices.

1. Viessmann Vitopend 100-W A1HB 24 - a single-circuit gas boiler with a capacity of 24 kW from a well-known German manufacturer has no competitors today in terms of the best price-quality ratio. The reliability of this manufacturer’s equipment belongs to the highest price category, while the price is set at the level of the lower price segment.

Models in the line:

Gas boiler Viessmann (Visman) Vitopend 100-W A1HB 24 kW

Gas boiler Viessmann (Visman) Vitopend 100-W A1HB 34 kW

Vitopend 100-W A1HB 24 is equipped with all the necessary safety systems, such as frost protection and pump blocking, auto-ignition and overheating protection. To this it is worth adding a comprehensive auto-diagnosis function and a convenient control system.

A high-quality copper alloy heat exchanger operates reliably even at low coolant temperatures, which is especially convenient in heating systems with heated floors.

Advantages:

• a digital controller with a comprehensive diagnostic system is combined with a built-in time relay, which allows you to set weekly and daily operating modes;
• reliable protection against fluctuations in gas pressure in the supply line and 220 V power supply voltage;
• weather-compensated automation qualitatively regulates the parameters of the heating circuit depending on fluctuations in outside temperature.

Flaws:

• the high price of spare parts is partially offset by the reliability of the device itself.

Expert opinion: an excellent German-assembled model with the best price-quality ratio.

2. Vaillant turboTEC plus VU 242/5-5 24 kW - a high-quality and expensive model from Germany with an installed power of 24 kW. The manufacturer's specialization in wall-mounted heating devices guarantees the reliability and durability of all components, and mandatory inspection of all heating equipment after its assembly implies the complete absence of manufacturing defects.

Models in the line:

Vaillant turboTEC plus VU 242/5-5 24 kW

Vaillant turboTEC plus VU 282/5-5 32 kW

Vaillant turboTEC plus VU 362/5-5 36 kW

Vaillant turboTEC plus VU has an integrated indirect boiler control circuit, which simplifies the preparation of hot water with an external water heater. The volume of the boiler is calculated based on the practical needs of the owner, which distinguishes single-circuit boilers from double-circuit boilers.

Among the technical features of the boiler, it is worth noting the electronic method of controlling pressure in the heating circuit and the safety valve with an electric drive.

Advantages:

• the ability to configure Vaillant turboTEC plus VU to partial power is well suited for small private houses or apartments;
• the primary heat exchanger made of high-quality copper operates reliably even at low coolant temperatures;
• a processor with a liquid crystal display monitors operating parameters, helps configure many functions and conducts automatic troubleshooting.

Flaws:

• high price for spare parts and service

Expert opinion: an excellent model of a single-circuit heating device with a closed combustion chamber from one of the best manufacturers, the widespread use of which is limited only by its high price.

3. Baxi LUNA-3 COMFORT 1.240 Fi is a third-generation gas single-circuit boiler with a capacity of 24 kW from an Italian manufacturer, which takes into account extensive experience in operating wall-mounted heating equipment in Russian conditions.

Models in the line:

Baxi LUNA-3 COMFORT 1.240 Fi 24 kW

Baxi (Baxi) LUNA-3 COMFORT 1.310 Fi art 31 kW

The main distinguishing feature of this boiler is the electronic control module, which can simultaneously serve as a remote thermostat with room temperature control. The purchase of just one outside temperature sensor for this option turns the Baxi LUNA-3 COMFORT into a fully automated boiler room, which itself monitors all heating parameters.

Another feature of this model is the low level of gas pressure (5 mbar), at which Baxi LUNA-3 remains fully operational.

Advantages:

• the copper heat exchanger is additionally coated with a special compound, which further increases its resistance to corrosion;
• the operating algorithm of this model includes operation at low coolant temperatures, which optimizes the operation of the Baxi LUNA-3 COMFORT with heated floors;
• built-in weather-compensated automation saves the owner money on purchasing external control devices.

Flaws:

• To install an external boiler, it is necessary to purchase an electric three-way valve actuator.

Expert opinion: a built-in room temperature control system with a remote panel and low gas consumption distinguishes this model from the best products of competing manufacturers.

4. Buderus Logamax U072 24 - a single-circuit 24 kW model from a well-known German manufacturer, specially designed for Russian conditions and adapted to power surges and natural gas pressure drops in the supply pipeline. The Buderus Logamax U072 is assembled at a newly built plant in the city of Engels, Saratov region.

Models in the line:

Buderus (Buderus) Logamax U072 24KW

Buderus (Buderus) Logamax U072 28Kw

Among the distinctive features of this device, it is worth noting the wide range of modulation of the burner flame, which allows you to optimize gas consumption when the outside temperature fluctuates. The boiler design also includes basic safety systems: protection against freezing and pump blocking, a maximum pressure safety valve, a flame sensor and a temperature limiter in the heating circuit.

Advantages:

• a simple and intuitive boiler control interface allows you to control its operation even by an untrained user;
• electronic ignition and ionization flame sensor increase the safety of gas equipment;
• extended voltage range of the electrical network (165 - 240 V) does not require additional installation of a voltage stabilizer.

Flaws:

• Many users note spontaneous reset of user settings, which leads to the need to re-configure operating modes.

Expert opinion: a fairly reliable boiler of Russian assembly, the quality of which is controlled by German standards.

5. Bosch Gaz 6000 W WBN 6000-24 N - the main difference between the single-circuit model with a closed combustion chamber from the German manufacturer is the high resistance of the device to natural gas pressure drops in the supply line and to voltage surges in the 220 volt electrical network. The power of the device is 24 kW, which is usually enough to heat apartments or private houses with an area of ​​up to 240 m².

Models in the line:

Bosch (Bosch) Gaz 6000 W WBN 6000-18 N

Bosch (Bosch) Gaz 6000 W WBN 6000-24 N

Bosch (Bosch) Gaz 6000 W WBN 6000-35 N

An important feature of the Gaz 6000 W WBN 6000-24 N is the built-in three-way valve, which facilitates the connection of an external indirect heating boiler for preparing hot water.

Another difference between the 6000 W series units with a closed combustion chamber is a modulated fan with automatic speed control. This feature optimizes the operation of the gas burner at different power values.

Advantages:

• a gas fitting leak sensor and ionization flame control qualitatively increase the safety parameters of gas equipment;
• built-in protection against overheating of the heating circuit protects the heating system from emergency situations;
• The service life of a copper heat exchanger is approximately 15 years, which is a very high indicator for wall-mounted models of heating equipment.

Flaws:

• • some owners complain about the quality and reliability of circulation pumps.

Expert opinion: A good and inexpensive domestically assembled boiler, the main advantage of which, as its owners note, is the low noise level and the availability of spare parts.

Device

The main components of a single-circuit gas wall-mounted boiler are:

• gas burner, which is connected to the primary heat exchanger;
• turbocharger fan;
• circulation pump;
• three-way valve;
• gas equipment;
• control board and self-diagnosis sensor system.

IMPORTANT!

The design of atmospheric boilers does not include a turbofan, and non-volatile installations have neither a circulation pump nor a control board. Such boilers operate only on mechanics, like a regular gas stove.

TOP rating of the best condensing models

There are only two models in the TOP rating of condensing boilers, since the requirements for condensate disposal are not yet understood by the owners of country houses. Heating devices with the condensation principle of heat extraction are more often used for apartment heating, which also has not yet found wide distribution in the domestic market segment.

1. Viessmann Vitodens 100-W WB1C102 - a single-circuit gas boiler with a power of 19 kW is optimal for heating an apartment or house with an area of ​​up to 200 m². Thanks to its high efficiency (98-99%), the condensing type model consumes significantly less natural gas, and the high-quality Inox-Radial stainless steel heat exchanger material increases the reliability of the device.

Models in the line:

Viessmann Vitodens 100-W WB1C102

Viessmann Vitodens 100-W WB1C103

Viessmann Vitodens 100-W WB1C104

One of the important distinguishing features of the Viessmann Vitodens 100-W is the innovative MatriX cylindrical burner, the characteristics of which determine the extremely low content of harmful substances in the exhaust gases.

Advantages:

• modulation of fan speed in a closed combustion chamber reduces energy consumption and increases the energy-saving properties of the heating device;
• a very wide range of flame modulation of the MatriX cylindrical burner optimizes the operation of the device over the entire power range;
• The very low noise level allows the Viessmann Vitodens 100-W to be installed even in residential areas.

Flaws:

• The sensitivity of electronic components to voltage surges requires the installation of a voltage stabilizer.

Expert opinion: the best solution for condensing boilers, the capabilities of which are confirmed by the quality of technological solutions from the most famous German manufacturer.

2. Vaillant ecoTEC plus VU INT IV 246/5-5 H - a German-assembled wall-mounted condensing gas boiler from the popular manufacturer Vaillant has a power of 24 W, which allows you to heat houses or apartments with an area of ​​up to 240 m².

Models in the line:

Vaillant ecoTEC plus VU INT IV 246/5-5 H

Vaillant ecoTEC pro VUW INT IV 286/5-3 H

Vaillant ecoTEC plus VU INT IV 306/5-5 H

Vaillant ecoTEC pro VUW INT IV 346/5-3

A distinctive feature of this device is the stainless steel heat exchanger of the heating circuit with the Aqua-Kondens system, which is one of the latest scientific developments of Vaillant.

Another important feature of the Vaillant ecoTEC plus VU INT IV 246 is the eBus standard communication bus, the connection connector for which is located on the front of the boiler. Connecting external thermostats via this bus allows you to control the modulation of the burner flame according to room temperature.

Advantages:

• two-stage circulation pump with automatic mode switching automatically adapts to the volume of the heating circuit;
• the digital information system DIA-System increases ease of use and reduces the time for diagnosing malfunctions of the heating device;
• modulation of the gas burner flame allows continuous operation in the power range from 20 to 100%, which further reduces gas consumption.

Flaws:

• The complex electronics of the device require the installation of a voltage stabilizer for a 220 V electrical network.

Expert opinion: Vaillant ecoTEC plus VU INT IV 246 certainly belongs to the heating equipment of the highest category of reliability, the widespread use of which is still hampered by the high price.

Which gas boiler is best for heating a home?

Conclusion: The technical advantages and disadvantages of single-circuit gas boilers determine their general selection rules, however, an important criterion at the initial stage is the availability of spare parts and services in a particular city or region. It is worth adding to this that even the most reliable boiler can fail if the operating rules are violated - changes in water quality, surges or loss of the electrical network, etc. From this point of view, it is advisable to provide a backup heat supply source in the heating system.

Which company should you choose?

Since a gas boiler is an expensive device that is purchased for a long time, it is better to give preference to appliances from well-known brands.

Companies that specialize in the production of heating equipment provide a guarantee for their devices, and use high-quality materials and modern technologies for their manufacture. In 2021-2022, as an analysis of user reviews showed, boilers from Protherm, Vaillant, Lemax, Baxi and Bosch were recognized as the best. It is these devices that are included in this rating.

Top five leaders in the production of gas heating equipment

The vast majority of heating gas equipment is represented on the domestic market for climate control equipment by European manufacturers, as well as some representatives of the Asia-Pacific Economic Community. Among the most popular in our country are manufacturers of gas boilers from Germany, Italy, the Czech Republic, Slovakia and South Korea.

The first place in the popularity ranking is shared by German gas boilers produced by the Vaillant Group concern and. The German brand Buderus shares second place among the most popular manufacturers with the German holding Viessmann, and third place was taken by the Slovak concern Protherm and the Italian company.

Next, the model range of each brand, design and operational features of heating devices will be considered.

Most popular manufacturers

The most famous and popular manufacturers of wall-mounted single-circuit boilers include:

• Vaillant;
• Viessmann;
• Buderus;
• BAXI;
• MORA-TOP;
• Protherm;
• Navien;
• Bosh;
• Ariston;
• Thermex, etc.

It is difficult and impractical to list all manufacturers. There are many of them, some companies are subsidiaries of more well-known concerns. In addition, new companies are constantly appearing on the market, which expands the range and makes the choice for the user more diverse.

Kinds

Wall-mounted single-circuit boilers are produced in various design options, which can be divided according to the following characteristics:

By type and material of heat exchanger:

• steel _ Stainless steel is used, which has average capabilities and efficiency. Such units are usually installed on units in the middle and low price range.
• copper _ This unit demonstrates increased heat transfer, durability and efficiency. Installed on expensive models from the most famous manufacturers.

On single-circuit boilers, as a rule, one structural type of heat exchanger is used - tubular. It is a spiral of steel or copper tube, which is heated by a burner flame.

The coolant passing inside manages to get a high temperature and exits to the next nodes completely ready for further work.

By type of burners and combustion chambers:

• atmospheric _ These are open type burners that use air directly from the room. To remove flue gases, they need to be connected to a traditional type chimney with natural draft;
• turbocharged _ These units are closed, so a turbofan provides fresh air and smoke displacement. Their combustion process is more stable, and there are never problems with smoke removal. The only problem may be a fan failure or a power outage.

According to the method of energy transfer:

• convection _ These are boilers that operate on the usual principle of heating the coolant using a burner.
• condensation _ A relatively new design, which uses a two-stage method of heating the coolant. First, it is heated from the heat obtained from the condensation of flue gases, and only after that it enters the heat exchanger, where it finally receives the set temperature. This technique allows you to significantly reduce gas consumption, since the coolant is already heated and does not require too intensive preparation . However, for the operation of condensing boilers, specific conditions are required - the condensation temperature must exceed the return flow temperature. This is only possible on underfloor heating systems, or when the temperature difference between inside and outside is no more than 20°. This is impossible in Russia.

NOTE!

When purchasing a condensing boiler, you should not trust the declared efficiency, which is 107-109%. This is a common marketing ploy. We must first understand how this unit works.

Baxi, Proterm or Navien, what else would you recommend for 100 sq. m.

If you need a cheap boiler, then of course Proterm, if you decide to invest in an expensive one, then of course Vailant (Proterm, a cheaper brand of this manufacturer). It makes sense to buy a Baxi only if they sell it to you very cheaply (there are huge discounts on them), the advantage is a good service network, but cheap models like Main For are absolute rubbish! Navn is generally a temporary cauldron for severe punishment of sinners! Everyone who was sold it goes broke during use and loses their nerve due to constant and regular breakdowns, and the customer service is reduced to telephone advice and mail-order sales of very expensive spare parts. Therefore, many people throw away Navien without waiting for the end of the first heating season. Wissmann boilers are of absolute German quality and reliability, amazing durability proven by many years of Russian operation, minus they are more expensive than all of the above.

Buderos Germany

What a difference you have - comparing Baksi with Navien... Like Opel and Zaporozhets - both drive, but how... If possible, take Baxi - excellent boilers from a good company with a very developed service network...