TOP 15 best double-circuit gas boilers: 2021-2022 rating for heating a private home

Today, gas boilers are the best solution for heating almost any private house or apartment, both in terms of reliability and practicality, and in terms of purchase cost and operating costs. Every year, one can more and more clearly observe a trend towards a preference for wall-mounted models: less universal, exclusively energy-dependent, but more efficient, compact and, in practice, according to statistics of service calls, almost as reliable.

In the article we will look at how to wisely choose an even more interesting option - double-circuit wall-mounted gas boilers, which allow, with the same size and efficiency, to provide the house with hot water. The cost of dual-circuit models is only 10-15% higher, so this is the cheapest way to organize hot water supply at home.

Rating of the TOP 15 best double-circuit gas boilers of 2021-2022

Ariston Thermo Group

The Italian manufacturer of thermal comfort equipment Ariston has been presenting its products on the Russian market since 2005. It all started with the opening of a new plant and the active development of a dealer network, on the basis of which service centers were organized. Today there are 400 authorized representatives servicing boilers with a 2-year warranty. Thanks to reliable gas automation and control electronics, the equipment shows stable operation. This allowed a third of service centers to announce an extended warranty program (up to 8 years). Some models of Ariston gas boilers

Watch a video about the work of the Russian Ariston plant:

How to choose and what to pay attention to?

1. Control method : single stage. two-stage or three-stage. Two-stage boilers adapt best to daily and seasonal temperature changes.
2. Heat exchanger type : separate or bithermic devices. Separate ones have 2 heat exchangers: one for heating, the second for hot water supply. In such boilers, scale does not form and boiling of water is eliminated, but they are more expensive. Bithermic ones have double elements, the disadvantages are worse cross-country ability and scale formation.
3. Automation : mechanical or electronic. Electronic ones are more expensive, but in case of problems with electronics, additional repair costs are required.

Thermona spol. s ro

All activities of the Czech company Thermona, spol. s ro is aimed at developing its own production base. The refusal to cheaply assemble gas boilers abroad indicates a desire to maintain the achieved quality indicators. Thanks to which reliable mounted and highly productive floor models are widespread in the Russian Federation. Each device features automatic flame modulation and equithermal (taking into account the main climatic factors of the external environment) regulation. There are options with open and closed chambers. The installation, configuration and maintenance of these devices can be entrusted to one of the two hundred authorized service centers in Russia. Some models of gas boilers Thermona, spol. s ro

Watch a video about Thermona, spol. s ro:

The best double-circuit gas boilers in terms of price, quality and reliability

BAXI ECO-4s 24F 24 kW

A mid-priced convection boiler that can be installed in any room: bedroom or kitchen.

Works on both natural and liquefied gas. A closed combustion chamber allows you to spend less gas on heating, while the heating output remains high.

The primary heat exchanger is made of copper, the secondary one is made of stainless steel. There is a built-in circulation pump and expansion tank.

The display is installed on the case, there is also a thermometer, pressure gauge, and power-on indication. It is allowed to connect a separate chimney (with a diameter of no more than 80 mm) .

An air vent, safety valve and gas control are installed as protection.

The water is purified using an internal filter . Weighs 30 kg. Service life - 10 years, warranty period - 2 years. This model has proven itself well in 2021-2022.

Specifications:

• Thermal power: 9.30 - 24 kW;
• Thermal load: 10.60 - 25.80 kW;
• Dimensions: 400x730x299 mm.

pros

• pump blocking protection;
• connection of a warm floor,
• flame modulation;
• auto diagnostics;
• frost protection;
• heats liquid quickly;
• silent;
• reliable components.

Minuses

• You cannot adjust the power yourself.

Buderus Logamax U072-12K 12 kW

This model has received many positive customer reviews: users describe it as a reliable and convenient wall-mounted unit with a high level of safety and almost silent.

Changes in electricity and pressure do not affect its performance in any way. The power is enough to heat an area of ​​up to 350 sq.m.

The kit includes: pump, expansion tank, flow sensor, safety valve and control and safety device.

The size of the boiler allows it to be placed even in a small room: for example, a pantry or bathroom.

Index “K” means that water can be heated without the use of additional equipment.

An additional layer of thermal insulation on the walls of the unit will prevent it from overheating.

Intuitive control: LCD display with indication of operating parameters, 5 buttons and temperature controls. Weight - 29 kg. The warranty period is 24 months. The model is relevant for 2021-2022.

Specifications:

• Thermal power: 5.40 - 12 kW;
• Dimensions: 400x700x299 mm;
• Efficiency: 92%.

pros

• easy to install and operate;
• noise level: <36 dBA;
• holds the temperature without any complaints;
• can also operate on liquefied gas;
• heat exchanger service life: 15 years;
• functions of gas control, auto-ignition and overheating protection.

Minuses

• malfunctions in the heating system were noted.

Bosch Gaz 6000 W WBN 6000-18 C 18 kW

This model is designed specifically for Russian conditions, which means that the boiler is resistant to pressure changes (9-17 mbar) and network voltage (165-240 V), and is completely protected from freezing.

Easily and quickly heats an area of ​​180 sq.m. The water is heated in a plate heat exchanger, and little fuel is spent on its operation.

The main heat exchanger is made of high quality copper without impurities. There is a modulated fan and a gas valve seal sensor.

Circulation pump - built-in, three-stage.

The flame control electrode is ionization.

The heat exchanger is protected from overheating by an installed temperature limiter.

Display - LCD, with indication of operating parameters. The warranty period is 730 days. Weighs only 28 kg.

Specifications:

• Heating system power: 5.40 - 18 kW;
• Thermal load: 6 - 20 kW;
• Dimensions: 400x700x299 mm.

pros

• easy to use;
• it is easy to install;
• does not make noise during the process;
• high performance;
• you can connect external regulators (ON/OFF, Open-Therm);
• auto ignition;
• pump blocking protection;
• high-quality assembly.

Minuses

• The first launch is long.

Immergas SpA

Immergas SpA - no more than 1000 employees and 2 assembly plants (in Italy and Slovakia). With such a base, the Italian manufacturer has been supplying gas boilers to 43 countries since 2002. The competitiveness of products in the Russian Federation is explained by a combination of a long (10 years stated) service life and low gas consumption. For convection models, efficiency is achieved by increasing the area of ​​the heat exchanger and automatically preparing the gas-air mixture. Condensing boilers have an improved heat extraction circuit and a greater number of functions. The equipment is not demanding in terms of water and gas supply characteristics. The manufacturer provides 1 year warranty for each model. A network of service centers located in more than 100 Russian cities is responsible for servicing boilers. Some models of gas boilers Immergas SpA

Watch Immergas SpA video:

The best wall-mounted double-circuit gas boilers

Lemax PRIME-V32 32 kW

Compact boiler in a stylish white box and made from European components (Valmex, POLIDORO, SIT, NordGas, Bitron).

The top lining is easily removed. You can connect a room thermostat to it to adjust the temperature inside the house as accurately as possible.

You can heat it with natural gas, or you can switch to liquefied gas without any problems.

LCD display, intuitive operation.

Adapted to gas changes. Combustion products are removed through a chimney (separate or coaxial - at the user’s request).

The unification of units and components is high, the thermal insulation is continuous, thanks to which residents will be as comfortable as possible near the unit.

It works stably even in the event of a sharp decrease or increase in voltage (185 - 245 v).

Specifications:

• Power parameters: 6 - 18 kW;
• Efficiency: 92.5%;
• Warranty period: 2 years;
• WxHxD: 430x770x268 mm.

pros

• there is a remote control function using Android and IOS;
• double level of protection against pressure in the circuit;
• sensors and sensors are protected from corrosion and scale;
• does not buzz or rumble during operation;
• sufficient power level;
• reasonable price.

Minuses

• no protection against pump blocking;
• volatile

Vaillant turboTEC pro VUW 242/5-3 24 kW

German quality standards and high-tech equipment - all this is reflected in the described wall-mounted boiler.

Its cost is high, but the functionality is excellent: electronic ignition; built-in switching module for eBus interface; switch winter-summer; possibility of manual configuration; “smart” pressure control in the system.

The user can configure the unit manually, or can trust the well-coordinated automation, which will find faults, if anything happens, and calculate all the parameters.

The burner is made of high-strength chromium-nickel steel, heat-resistant and heat-resistant.

The heat exchanger is plate-type, flow-through. The display is liquid crystal, has a backlight and convenient buttons. Weighs 40 kg. The warranty is given for 900 days, the service life is 10 years.

Specifications:

• Boiler power: 24 kW;
• Load: 9.40 - 26.70 kW;
• Parameters: 440x800x338 mm.

pros

• protection against freezing, pump jamming and fan problems;
• powerful;
• high-quality assembly;
• you can connect a separate chimney;
• flame modulation.

Minuses

• price (about 100 thousand rubles);
• expensive components;
• the pump is noisy.
• problems with post-warranty service in the regions.

Protherm Panther 25 KTV (2015) 25 kW

You can’t call it cheap, but it’s easy to call it high quality . The heat exchanger is made of copper (without

there are no foreign impurities), the combustion chamber is closed.

There is gas control, a safety valve, protection against freezing and overheating of the unit.

If the installation is left idle for a long time, the pump will turn on and off on its own to avoid blocking.

Convenient electronic control and autonomous operation distinguish this unit from competitors in the same price niche.

A pressure gauge is installed to monitor the coolant pressure.

It is possible to connect additional elements: room remote controls, programmers, thermostats.

The electronic system significantly saves fuel and does not require the constant presence of a person nearby.

Flame modulation reduces fuel consumption (both natural and liquefied gas). The warranty is valid for 730 days.

Specifications:

• Power: 8.40 - 25 kW;
• Thermal load: 9.40 - 27.10 kW;
• Weight: 41 kg;
• Dimensions: 440x800x338 mm.

pros

• connection of external control;
• auto diagnostics;
• all necessary types of protection are installed;
• long warranty period.

Minuses

• Efficiency is average;
• It is impossible to connect a heated floor.

Vaillant (Vaillant Group)

Vaillant's head office is located in Germany, with production and assembly facilities operating in Europe and Asia. Active promotion on the Russian market began in 1994. And the Russians were among the first to appreciate the potential of condensing equipment. A particularly noticeable effect was felt by users who modernized their communications - new powerful models turned out to be more compact than old equipment. Without compromising the temperature of the OS and DHW, gas consumption has decreased. In the early 2000s, the company provided the needs of some localities. Today boilers are sold and serviced in 7 federal districts of the Russian Federation. Some models of Vaillant gas boilers

Watch a video about the history of Vaillant:

The best floor-standing double-circuit gas boilers

Lemax Premium-30B 30 kW

If you need an inexpensive but powerful boiler, pay attention to this model . This

a non-volatile unit, which has both gas control and protection against abnormally high temperatures. The model is compact and takes up little space.

Its power is enough to create a comfortable, warm environment in a house with an area of ​​up to 300 sq.m., and that’s quite a lot!

Permitted fuel is natural gas . The primary heat exchanger is made of improved steel, the combustion chamber is open, and the assembly is of high quality.

Natural gas consumption - 3.5 cubic meters. m/hour . Weight - 88 kg. Efficiency - 90%. The maximum coolant temperature is 90 °C. Natural gas consumption - 3.5 cubic meters. m/hour.

Specifications:

• Dimensions (WxHxD): 556x961x470 mm;
• Chimney diameter: 130 mm;
• Warranty - 36 months.

pros

• affordable;
• there is a convenient thermometer;
• gas control function;
• powerful;
• reliable.

Minuses

• mechanical control only;
• It is prohibited to use liquefied gas.

Protherm Bear 30 KLZ 26 kW

Automatic boiler with two circuits. It will not only heat your home, but also heat

water for household needs.

The volume of the storage boiler is 90 liters, the heat exchanger is made of cast iron, which means that it is not afraid of corrosion, acids and aggressive external environments, it will withstand high temperatures and will serve you faithfully for at least 40 years.

4 sections, 2-way heat exchanger . The weight of the unit is 155 kg. Coolant temperature - 45 - 85 °C.

Electric ignition is smooth, it is possible to install an additional fan to remove flue gases.

Manufacturer's warranty - 2 years. In case of abnormal temperatures it automatically turns off. There is pump blocking protection.

Specifications:

• Dimensions (WxHxD): 505x1385x730 mm;
• Thermal power - 18.20 - 26 kW;
• Thermal load - 20 - 28.50 kW.

pros

• you can use liquefied gas as fuel;
• electronic control;
• there is a built-in boiler;
• “smart” diagnostics;
• flame modulation"
• frost protection.

Minuses

• very heavy;
• no power-on indication;
• You cannot install a separate chimney.

Lemax Premium-20B 20 kW

A domestic development, which in terms of its mechanics is absolutely not inferior to foreign units.

It corresponds to the declared power, has good efficiency (90%), is made of inexpensive, but high-quality and durable steel.

The necessary functionality is installed: gas control, protection against excessive heating of the housing.

A non-volatile model that is not afraid of power surges and power outages.

The combustion chamber is open. Heated area - up to 200 sq.m. Gas connection pipe - 1/2″.

Max. water pressure in the heating circuit is 3 bar, in the DHW circuit - 6 bar . The permissible coolant temperature is 90 °C.

Specifications:

• Maximum thermal power: 20 kW;
• Dimensions: 556x961x470 mm;
• Warranty period: 36 months;
• Boiler weight: 83 kg.

pros

• affordable;
• non-volatile;
• compact dimensions;
• great guarantee.

Minuses

• cannot be connected to underfloor heating.

Viessmann

The international company Viessmann Werke GmbH & Co. KG offers on the Russian market more than 50 modifications of 3 basic models of gas boilers. Automatic ignition of the burner, flame control and many sensors involved determine safety and ease of use. The boilers are programmed for periodic self-diagnosis. Well-thought-out device systems eliminate frequent interference with its operation. Service center specialists are invited to prepare for the first start-up and conduct annual maintenance. Some models of Viessmann gas boilers

Watch a video about Viessmann:

The best non-volatile double-circuit gas boilers

Lemax Premium-12.5B 12.5 kW

Trouble-free boilers with good automation and at an affordable price . Warms up well

a room with an area of ​​more than 100 square meters.

The connection pipe for the circuit is convenient, heats the water well and quickly. The efficiency is almost 100%.

It works by burning gas, specifically methane . Ignites manually. The steel coolant is not afraid of deformation and impacts; it will last from 5 to 20 years.

Thanks to manual control, it is possible to save fuel . The control panel is reliable.

Install a thermometer to monitor the temperature in the boiler. There is overheat protection.

Specifications:

• Maximum thermal power: 12.50 kW;
• Max. coolant temperature: 90 °C;
• Natural gas consumption: 1.5 cubic meters m/hour.

pros

• independent from the electrical network;
• inexpensive;
• quickly heats the liquid;
• there is protection against overheating;
• there is gas control;
• thermometer.

Minuses

• uneconomical;
• large heat losses;
• there is no protection against pump blocking and flame modulation.

Lemax Premium-25B 25 kW

A fairly massive and large-sized boiler running on natural gas.

Capable of dispensing approximately 7 liters of boiling water in 1 minute.

There is no connection to the network, ignition is done manually, the coolant works without a pump.

Material: steel.

It is durable, cheap and light in weight . You can set the basic parameters yourself.

If the water reaches high values, the boiler automatically turns off.

There is a function to turn off the gas in case of flame extinguishment. Efficiency - 90%, weight - 88 kg. Gas consumption is low. The heated area is large - 250 sq.m.

Specifications:

• Boiler dimensions: 556x961x470 mm;
• Warranty period: 36 months;
• Natural gas consumption: 3 cubic meters m/hour.

pros

• easy to operate;
• reasonable cost;
• reliable.

Minuses

• There are no weather electronics.

Lemax Premium-16B 16 kW

An inexpensive option, optimal in its characteristics, suitable for both an apartment and a country house with an area of ​​160 sq.m..

It does not depend on the power supply; overheat protection will disconnect the device from the network when the maximum allowed temperature is exceeded.

A sensitive sensor is installed to prevent gas leakage.

It is necessary to install the unit, observing the required distances from the walls. Open combustion chamber, efficiency - 90%.

The warranty period is set at 36 months . Fuel - methane. The boiler produces 5 liters of hot water per minute. Mechanical control.

Specifications:

• Parameters: 416x744x491 mm;
• Weight - 60 kg;
• Chimney diameter is 130 mm.

pros

• heats the room well;
• inexpensive in price;
• qualitative;
• practical;
• there is protection against flame extinction.

Minuses

• it is prohibited to use liquefied gas in this model;
• There is no room thermostat and pressure gauge.

KD Navien Co., Ltd.

Promoting the idea of ​​making a feasible contribution to the development of society in the business environment, the NAVIEN company takes an active part in insulating the homes of compatriots in need. Inexpensive equipment designed according to the condensation principle is supplied to the Russian Federation. The ability to control the boiler remotely (from a remote control or from a smartphone) promises the user ease of use. Provided high-quality service is provided, even a small percentage of manufacturing defects (unconditionally accepted by authorized service centers, within the framework of warranty) does not cause any complaints. Some models of gas boilers KD Navien Co., Ltd.

Watch video of KD Navien Co., Ltd.:

The best condensing double-circuit gas boilers

BAXI Duo-tec Compact 24 20 kV

The developers of the Duo-tec Compact series have successfully combined advanced technologies, ease of installation, and ease of operation in one model.

This is one of the best adaptive models, equipped with a super-modern burner (which is capable of pre-mixing air with gas), a very convenient control panel and a bunch of devices and functions (auto-ignition, pressure gauge, thermometer, etc.).

The specified service life is 10 years, which means that for a very long time you will not have to worry about the heating system of your home area.

Weighs 34 kg, compact and stylish in appearance model with internal filtration of incoming liquid, installed air vent and safety valve.

Specifications:

• Warranty: 2 years;
• Parameters: 400x700x299 mm;
• Power: 3.40 - 20 kW;
• Load: 3.50 - 20.60 kW.

pros

• external control can be connected;
• auto ignition;
• flame adjustment;
• pump blocking protection;
• Efficiency is above one hundred.

Minuses

• energy dependent;
• no built-in boiler.

Protherm Lynx18/25 MKV 18 kW

This boiler has almost all the necessary functionality: a convenient closed combustion chamber, an air vent, a safety valve.

Thanks to its small size and wall installation, the boiler takes up little space and saves space.

Thanks to the auto-diagnosis function, the user will find out what kind of malfunction has occurred (you just need to look at the table with codes), and flame control will not allow gas to escape into the room if the flame suddenly goes out.

The primary heat exchanger is made of aluminum (which is why it weighs so little).

The control panel is electronic . The efficiency percentage is high (more than 100). On the front of the case there is a backlit display and a thermometer.

The circulation pump and expansion tank are built-in.

The warranty period is 2 years.

Specifications:

• Power parameters: 5 - 18 kW;
• Thermal load: 5.10 - 18.40 kW;
• Dimensions: 390x700x280 mm.

pros

• connection of external control is allowed;
• auto ignition;
• the boiler is protected from freezing and excessively high temperatures;
• blocking protection is installed;
• flame modulation allows you to save fuel.

Minuses

• liquefied gas as a fuel is prohibited;
• energy dependent.

BAXI NUVOLA Duo-tec+ 16 12 kW

If you need a lot of hot water, this model is ideal . Burner from

stainless steel - a new generation, allows you to pre-mix fuel with air.

The combustion system is adaptive. If the pressure drops (even to a level of 5 mbar), the rated power will be maintained.

The hot water output in the first 30 minutes is more than two hundred liters . Pump post-circulation, automatic bypass, filter installed at the cold water inlet.

The control panel is convenient, with a wide display.

The temperature can be regulated either by a person or automatically: you just need to set the necessary parameters. Fire control is ionization.

Specifications:

• Boiler power: 2.20 - 12 kW;
• Load: 2.30 - 12.40 kW;
• Warranty: 24 months.

pros

• excellent efficiency level: 105.8%;
• weather-compensated automation;
• digital indication of pressure and temperature;
• When the pressure drops, the electronic pressure gauge is activated.

Minuses

• no room thermostat;
• Expensive.

DAEWOO GASBOILER CO.,LTD

South Korean manufacturer DAEWOO GASBOILER CO.,LTD. has officially supplied gas boilers to the Russian Federation since 2005. The models are equipped with separate heat exchangers and a full-fledged control system (gas and water pressure sensors), there is self-diagnosis. Based on its readings, the built-in microprocessor controls the burner and circulation pump. Smooth flame adjustment and 3 coolant pumping speeds guarantee stable operation throughout the entire adjustment range. The required operating mode is set by the user via the information panel or remote control. The entire range of equipment and service are available in every region of the Russian Federation. Some models of gas boilers DAEWOO GASBOILER CO.,LTD.

Watch the video presentation of DAEWOO GASBOILER CO.,LTD.:

Types of double-circuit gas boilers

• Condensing boiler - generates heat not only due to the fact that gas is burned inside, but also due to the effect of condensation of water vapor (it is formed as one of the combustion products). This is durable equipment with high efficiency.
• Non-volatile boiler - works in difficult conditions without electricity. Such devices last a long time, are easy to operate and save energy.
• Wall-mounted boilers require mounting on the wall, with a mandatory indentation from other equipment and furniture. They combine both a heating boiler and a water heater. Suitable for small houses (350-400 sq.m. area).
• A convection boiler differs from a condensing boiler in only one way - the more complex principle of heat accumulation.

Trust but check

There is an opinion about the logic of choosing time-tested equipment. But, under the brand name of each brand, both improved “classics” and fundamentally new models appear. The idea that it is justified to purchase the most budget models from famous manufacturers does not stand up to criticism either. Without proportionately taking into account the serviced area (with water points) and the declared potential of the heating boiler, it is impossible to make the right decision. Analysis of problem situations, in 80% of cases, reveals errors in the selection and operation of heating devices.

How to choose the power of a gas boiler

Do not strive to buy a boiler with the highest power . Based on the number of boiling water collection points in your home: the more there are, the more power you need.

About a third (30-40%) is spent on heating, add to these data another 10-20% of inevitable heat losses.

The remainder should be enough to heat your house or apartment . Example: for a house with an area of ​​200 sq.m. and with one bathroom, a boiler with a power of 24 kW is sufficient.

Insulating your home will help avoid significant heat loss and save fuel.

Operating principle of double-circuit boilers

In heating mode, the unit operates as follows: after the first switching on, the burner “warms up” for a long time, and having reached the required numbers, gas stops flowing into the boiler.

The coolant drives heat back and forth through the coolant, combustion products are removed from the system (either by a fan or independently).

In the heating mode of the water circuit, its operation begins with the turn of the tap. The three-way valve stops the heating circuit, the gas burner lights up (if it was turned off) and hot water starts flowing from the tap.

Summary

If you want to fully protect your gas boiler from force majeure, maintain flow stability with several water points and achieve maximum efficiency of the heating circuit, then you need to choose a suitable uninterruptible power supply, an indirect heating boiler and replace old radiators. Read our reviews of the best equipment:

• 11 best UPSs for gas boilers in three price categories →
• 16 best indirect heating boilers for home →
• 20 best models of heating radiators for apartments and private houses →

and your heating system will only stop for maintenance.