TOP 20 best dual-circuit gas boilers: 2024-2025 ranking in terms of price / quality

Autonomous heating is efficient and moderately budgetary, but only if you will be satisfied if you buy a decent boiler.There are many devices on the market, each has both pluses and minuses, the price tags also differ by an order of magnitude. We will help you decide on the type and model of a double-circuit gas boiler: just read our article and make a choice.

Rating of the best double-circuit gas boilers for 2024-2025

Place	Name	Price	Rating
The best double-circuit gas boilers for price / quality for 2024-2025
1	Viessmann Vitopend 100-W A1JB011	Ask for a price	4.9 / 5
2	BAXI ECO-4s 24F	Ask for a price	4.8 / 5
3	Neva Lux 7218	Ask for a price	4.7 / 5
The best double-circuit wall-mounted gas boilers for an apartment
1	Buderus Logamax U072-35K	Ask for a price	4.9 / 5
2	Mizudo M24T	Ask for a price	4.8 / 5
3	Lemax PRIME-V20	Ask for a price	4.7 / 5
The best double-circuit gas boilers for a private house
1	Lemax Premium-30B	Ask for a price	4.9 / 5
2	Conord AOGVK - 11.6-1	Ask for a price	4.8 / 5
3	Siberia 23К	Ask for a price	4.7 / 5
The best double-circuit gas boilers for 24 kW
1	Navien Deluxe S COAXIAL-24k	Ask for a price	4.9 / 5
2	Buderus Logamax U052-24K	Ask for a price	4.8 / 5
3	Viessmann Vitodens 050-W BPJC	Ask for a price	4.7 / 5
The best volatile double-circuit gas boilers
1	Lemax Premium-25B	Ask for a price	4.9 / 5
2	FEDERICA BUGATTI ECO 32 TURBO	Ask for a price	4.8 / 5
3	Ariston CARES XC 15FF	Ask for a price	4.7 / 5
The best double-circuit gas boilers with a combustion chamber
1	Buderus Logamax U072-28K	Ask for a price	4.9 / 5
2	Bosch Gaz 6000 W WBN 6000-18 C	Ask for a price	4.8 / 5
3	Lemax PRIME-V32	Ask for a price	4.7 / 5
The best budget double-circuit gas boilers
1	Buderus Logamax U072-12K	Ask for a price	4.9 / 5
2	Lemax Premium-16B	Ask for a price	4.8 / 5

How to choose a double-circuit gas boiler?

• Boiler power: Approach your needs objectively. The optimal indicator varies between 17-35 kW. Start from the number of hot water intake points: the more there are, the more power should be.
• Heat exchanger: can be separate or bithermic. Separate has more advantages: firstly, boiling of liquid in the system is excluded, and secondly, there is no scale.
• Power adjustments: one-stage, two-stage and three-stage. The two-stage ones are the most convenient: they are easier than others to adapt to daily and seasonal changes in air temperature, and their service life is extended.
• Heat exchanger material: can be made of steel, copper and even cast iron. Cast iron and heavy, and bulky, and do not tolerate temperature changes, but no one can compare with them in terms of service life: 32-30 years. Steel is lighter, more resistant to temperatures, but susceptible to corrosion.Copper is the best metal in terms of heat dissipation characteristics. It weighs little, cools down and heats up quickly, has a high efficiency, lasts 14-17 years.

The best double-circuit gas boilers for price / quality for 2024-2025

1. Viessmann Vitopend 100-W A1JB011

One of the best double-circuit gas boilers on the domestic market. With it, you can heat a room of almost 300 square meters: just imagine the area!

It has a high efficiency (91%), a reliable circulation pump and a built-in large volume expansion tank. The gas control function will not allow trouble to happen in case of problems with gas: the system, at the first sign of a malfunction, turn off the gas supply until the situation is corrected. There is frost protection, as well as protection against overheating of the tank.

You can connect external control. Installed auto ignition and a thermometer to control the temperature, there is a programmer and a pressure gauge. Liquefied gas is used. Information is displayed on a convenient display. The warranty is given for 2 years, the service life is 15 years. The mains voltage is single-phase, and you need a UPS or a stabilizer. The volume of the expansion tank is 10 liters. The boiler is hung on the wall, it cannot be placed on the floor. The safety valve (Viessmann Vitopend 100-W A1JB011) protects the system from excess water pressure in the circuit in excess of the maximum allowable rate.

Specifications:

• power: 29.9 kW;
• WxHxD: 450x725x360 mm;
• weight: 39 kg;
• Max. thermal power: 29.90 kW;
• Max. thermal load: 32.80 kW.

2. BAXI ECO-4s 24F

These models of boilers are distinguished by ease of installation, compactness and reliability. Each has a hydraulic group made of composite materials, a pair of separate heat exchangers for heating and hot water, as well as a turbine flow sensor (such a sensor is a guarantee of comfort when using boiling water). Another major plus is an intuitive control interface that provides advanced self-diagnostics and complete information about the operation of the device.

There are brackets on the case to hang the device. Electronic ignition, smooth. A little effort with the settings - and the device will be able to work on liquefied gas. The air supply system is honed to a shine (models with closed chambers). Stainless steel has been chosen for burner dividers. The hydraulic group consists of composite materials. Can be connected to solar collectors. There is a filter at the cold water inlet.

Specifications:

• dimensions: 730x400x299 mm;
• nominal input pressure of natural gas: 13-20 mbar;
• electrical power/voltage: 130/230 W/V.

3. Neva Lux 7218

A solid boiler of domestic production, which is worth talking about in more detail. It is designed for hot water supply and heating, so this device is more than enough for your home, as they say. The built-in bithermic heat exchanger allows its use in apartment buildings. The total heated area is 180 square meters.

Of the advantages, one can note the constant modulation of the flame, accurate temperature maintenance with a minimum error (less than 1 degree), as well as a built-in security system. Nice appearance allows you to hang this model in the kitchen with any design. The combustion chamber is closed, the pressure ranges from 0.2-6 bar. Adapted to the climatic conditions of Russia.

Specifications:

• dimensions: 720x410x326 mm;
• weight: 34 kg;
• Efficiency: 90%.

The best double-circuit wall-mounted gas boilers for an apartment

1. Buderus Logamax U072-35K

Model with closed combustion chamber: reliable, efficient and durable, ideal for use in our country. The system withstands frequent pressure drops in gas lines, as well as power surges. The model is suitable for use in homes with hard water (up to 16° dGH). The control system is simple, the menu is pleasant, the boiler can be adjusted to your requirements in a couple of minutes.

The LCD display informs the owner of the current operating parameters and prompts: what problems have occurred in the system. The wide range of the built-in burner ensures the most comfortable adaptation to the current power.

Work either on liquefied or natural gas is allowed. The ionization electrode helps control the flame, the ignition is electronic. Will heat the room with an area of ​​110-240 m2. Pump anti-blocking and flame detection will make your life even easier and simpler.The noise level is low - about 36 dBA.

Specifications:

• dimensions: 485x700x315 mm;
• weight: 39 kg;
• admissible pressure of liquefied gas: 25 mbar;
• natural gas consumption: 3.9 cubic meters m/hour.

2.Mizudo M24T

Another compact model with an ergonomic design and a simple control panel. LCD display in colors displays all the information you need. The assembly is carried out in compliance with all the rules and regulations, so Mizudo models stand out for their accuracy and fine fitting of parts.

The hydraulic group is made of brass, the primary heat exchanger is made of high quality copper with anti-corrosion coating. The pipes are also copper. Flame modulation occurs automatically. The device is resistant to corrosion and scale, protected from lack of traction, strong pressure and flameout. Overheating is not observed. Can run on LPG. Warranty 3 years.

Specifications:

• dimensions: 403x693x247 mm;
• weight: 29 kg;
• nominal pressure of natural gas: 7 - 25 mbar.

3. Lemax PRIME-V20

On the specialized site ExpertKotel.ru, this model is described as reliable, powerful and easy to maintain, so we suggest taking a closer look at it. A model with an open chamber and a double-circuit hot water supply will provide heat and water at the same time.Floor mounting, rated power is 16 kW.

The primary heat exchanger is made of steel, the secondary is made of copper. Mains voltage is single-phase, expansion tank of medium volume (6). The manufacturer placed a display in the upper part of the case, there is a backlight to make it more convenient to use it in the dark. The consumption of liquefied gas is small. Diagnostics is performed automatically, the built-in auto-ignition is triggered. There is an on indication.

Specifications:

• Efficiency: 90%;
• hot water consumption at ?Т= 30°С: 5 liters per minute;
• chimney: 130 mm.;
• weight: 60 kg.

The best floor double-circuit gas boilers for a private house

1. Lemax Premium-30B

A boiler with a maximum level of efficiency and good functionality, designed to heat a room with a huge area: 300 square meters. The main "buns" are here: gas control function, overheating protection. Floor installation. so you'll have to look for a special place for it.

Mechanical control, i.e. through buttons. And, on the one hand, this is a plus: buttons break less often than sensors, and they are easier and cheaper to repair. There is protection against overheating. Chimney diameter - 130 mm. There are no algorithms for saving electronic type fuel, but you can get used to it.

Specifications:

• factory warranty period: 3 years;
• dimensions: 961/470/556;
• flue diameter: 130 mm.

2. Conord AOGVK - 11.6-1

By installing this model in a room (observing all the distances from the walls), you will receive a reliable and faithful assistant who will not leave you freezing even in the coldest time. The boiler runs on natural gas, consuming approximately 1.38 cubic meters per hour. In addition to heat, the device also provides hot water: 3.3. liters per minute (liquid temperature - within 30 degrees). Connection to the power grid is not required. The coolant circulates naturally, without a pump.

The heat exchanger is made of steel: this material is light, durable, tolerant of shocks and deformations. The control is mechanical, so there will be no headache in case of a breakdown (touch panels are much more expensive to fix). The thermometer helps to control the temperature of the coolant in the boiler. The gas control function stops the gas supply if the fire goes out for any reason. Efficiency for exhaust gases is not less than 85-90%.

Specifications:

• heating capacity: 11.6 kW;
• heated area: 116;
• WxHxD: 320x953x406 mm;
• weight: 36.8 kg.

3. Siberia 23K

A series of gas boilers Siberia in terms of quality and reliability is on a par with eminent European manufacturers. Model 32K is a combined device designed for heating a dwelling and obtaining hot water for household needs. The smoke is removed by the draft of the furnace heating. The built-in thermometer determines the temperature of the liquid, the pressure is monitored by a capillary pressure gauge.

There is a piezo ignition and numerous sensors (smoke, flame, traction control). Atmospheric burner (open type), made of stainless steel. The chimney diameter is 125 mm. The warranty is given for 24 months, but the service life is huge - 25 years (naturally, with proper maintenance and care).

Specifications:

• chimney: 125 mm;
• weight: 65 kg;
• dimensions: 850 × 380 × 560 mm;
• boiler power: 23 kW.

The best double-circuit gas boilers 24 kW

1. Navien Deluxe S COAXIAL-24k

Efficient and compact model with high performance, the design of which will appeal to any buyer. Classic lines, soft shades - nothing more. Mounted on the wall. The heat exchanger is made of stainless steel. There is a pump protection against jamming. It is possible to connect a separate chimney with a diameter of 80 mm.

A small display is installed on the case, a remote control is included. Heated area - 240 sq.m. The efficiency level is 91.4%. Mains voltage is single-phase. The circulation pump is built-in, there is an expansion tank. It is easy to remove the components (secondary heat exchanger, three-way valve and hydraulic group components). A special upgraded SMPS chip protects the controller from power surges.

Specifications:

• weight: 400x655x255 mm;
• weight: 26 kg;
• Max. water pressure in the DHW circuit: 8 bar.

2.Buderus Logamax U052-24K

Buderus are time-tested technologies. The manufacturer does not use fundamentally new solutions in its models, but it tries to approach the choice of materials as responsibly as possible, controls the assembly, and in general - it has long been loved by a huge mass of people precisely for its decent attitude to business. The closed combustion chamber and good assembly will provide you with both heat and hot water. Moreover, boiling water will flow not only into 4 independent circuits, but also into the “warm floor” system.

Works well in a mode with a constant temperature of the coolant or in a weather-dependent mode with power control from 7.8 kW to 28 kW. The adjustment is simple, you can adjust the temperature using a pair of regulators. The display shows the actual temperature. Large selection of accessories for ventilation ducts and chimneys. Installation is fast, maintenance is convenient, commissioning is trouble-free and can be carried out alone.

Specifications:

• unpacked weight (kg): 40;
• maximum pressure in the DHW circuit (bar): 10;
• expansion tank volume (l): 8;
• outlet temperature (°С): 40-60;
• flue connection (mm): 60/100.

3. Viessmann Vitodens 050-W BPJC

Your ideal choice for modernizing the heating system in your home or office. The price tag is average. The boiler is hung on the wall. Energy efficiency class: A (highest).In its class, this model is the most compact and convenient for multi-storey buildings. The high-quality heat exchanger and stainless steel cylindrical burner successfully convert energy into heat, giving a high percentage of efficiency (97%).

The cylindrical infrared burner not only ensures maximum combustion efficiency, but also reduces CO2 emissions (this indicates that the manufacturer is trying to take care of nature). Power in the range of 6.5 - 24 kW. The energy efficiency class is high, both liquefied and natural gas are used as fuel. The control is simple, there is a liquid crystal display. The fan is a built-in exhaust fan.

Specifications:

• coaxial flue diameter: 60/100 mm;
• WxHxD: 400x707x350 mm;
• weight: 35 kg.

The best non-volatile double-circuit gas boilers

1. Lemax Premium-25B

By purchasing Premium-25B from the domestic brand Lemax, you definitely won’t waste your money. This boiler with an open combustion chamber works without a hitch in a closed heating system with a working pressure of up to 3 atmospheres. There is no need to frantically look for a place for an outlet during repairs: it does not require an electrical connection.

High-grade steel with a thickness of 2 mm to securely keep the internal system. Part of the parts are Italian, which means quality and reliability. A special coating (anti-corrosion enamel) plus an inhibitory composition protect the heat exchanger from the aggressive effects of salts and other external factors.There is protection against overheating and blowing out of the boiler, the system is also protected from soot formation and interruption of draft. The efficiency is high. Heats approximately 250 square meters.

Specifications:

• gross weight: 81 kg;
• factory warranty: 3 years;
• nominal pressure of natural gas: 1300 Pa;
• heat carrier volume in the heat exchanger: 41 l.

2. FEDERICA BUGATTI ECO 32 TURBO

One of the most functional - and the most expensive, alas! — non-volatile double-circuit gas boilers. This high-tech and modern (and we mean not only the appearance) device has one of the largest guarantees: as much as five years. It can be attached to the wall, as well as hidden in a niche or cabinet.

Looking at the certificates, we will see that the product meets all the requirements of safety, quality and environmental friendliness. The level of efficiency is high (93%). The device is equipped with all existing means of protection: against pump jamming, overheating, condensation, smoke exhaust safety and even low voltage.

Flame modulation is electronic, an intelligent protection system is installed. The diagnostic system is automatic. Component parts are purchased from different countries: gas valve, heat exchanger and burner from Italy, pump from Denmark. The chamber has an additional layer of thermal insulation. You can connect a room regulator. Country - Turkey.

Specifications:

• weight: 34 kg;
• height: 730 mm;
• heating area: 320 sq.m.;
• power, kW: 32.

3. Ariston CARES XC 15FF

Is it worth paying attention to the double-circuit gas boiler Ariston CARES X 15 FF NG? We heartily recommend it! The traditional type of wall-mounted boiler runs on natural gas and lasts 8-10 years, often longer. What's inside? Built-in expansion tank, circulation pump and 3-way valve. The number of cycles is reduced compared to its predecessor, which has a positive effect on the service life.

Intuitive control will not give you trouble. Voltage - 230 V, frequency - 50 Hz. The country of origin is Italy. The length of the electric cable is one and a half meters. The display is liquid crystal, with the sweetest backlight. The thermostat and thermostat-programmer will help to maintain a comfortable temperature in the room. The DHW heat exchanger is made of stainless steel, the main heat exchanger is copper. The combustion chamber is closed.

Specifications:

• height: 745 mm;
• width: 400 mm;
• depth: 315 mm;
• weight: 28 kg.

The best double-circuit gas boilers with a closed combustion chamber

1. Buderus Logamax U072-28K

This boiler is not afraid of any power surges, or pressure surges, or difficult environmental conditions - it is resistant, like a tin soldier, and reliable, like a Swiss watch. Compact, modern and ergonomic device for you and your loved ones. The volume of its tank is enough for a family of several people, and the heating will not be interrupted during the heating of water. P

The flexible heat exchanger built into the working circuit is made of high quality materials.Modern automation gives you a system tailored to your personal needs. Operation is simple and intuitive, operating parameters are entered quickly.

The LCD display is informative and pleasing to the eye, allowing you to monitor in real time all changes in the working rhythm. The operating voltage range ranges from 165-280 V. The expansion membrane boiler has a volume of 8 liters. The burner has a wide modulation range.

Specifications:

• maximum pressure in the heating circuit: 3 bar;
• minimum flow pressure: 0.3 bar;
• dimensions (H/W/D): 400/299/700 mm;
• weight: 34 kg.

2. Bosch Gaz 6000W WBN 6000-18 C

You are already familiar with the Bosch brand and for sure, you fell in love with the equipment of this world-famous brand. A wall-mounted gas-fired boiler will heat an apartment, office and a small house. The design is double-circuit (i.e. the device gives you both heat and hot water), the combustion chamber is closed, with forced smoke removal, the flame modulation is electronically controlled.

Heated area - 180 square meters. Air enters the working chamber through a coaxial chimney. The liquid crystal display shows the data. You can control the settings using the keypad. A room thermostat can be connected. The minimum temperature of hot water is 40 degrees, the minimum is 60 degrees. It will take you only 10 minutes to start the boiler for the first time. If desired, you can reconfigure the system for liquefied gas.

Specifications:

• warranty: 24 months;
• brand country: Germany;
• production: Russia;
• weight: 32 kg;
• HxWxD: 700x400x299.

3. Lemax PRIME-V32

The last model with a closed combustion chamber that we will analyze today is the Lemax PRIME-V32. The described boiler will serve you faithfully for years, and you will not have serious claims against it. With regular and proper maintenance, you will receive only positive emotions!

Build quality, materials are good. The burner does not go out, keeps a constant temperature for the time you need. Number of circuits: single circuit. The cylindrical shape of the heat exchanger allows you to work at a pressure of 2 atm (in closed systems). Case material - thick steel of increased flatness. Aggressive factors such as mineral oils and salt solutions are not dangerous to the device.

The use of liquefied gas is allowed. Efficiency increased, primary and secondary air inflows are also increased. The boiler meets all basic safety and environmental requirements. The top cover is removed for cleaning inside the box. Heat exchanger overheating sensor installed. Placed on the floor.

Specifications:

• power (kW): 16;
• dimensions without packaging: 416x744x491 mm;
• flue diameter: 130 mm.

The best budget double-circuit gas boilers

1. Buderus Logamax U072-12K

One of the best models among budget double-circuit gas boilers.The Buderus trademark belongs to Bosch Thermotechnik GmbH and has been producing heating equipment for so long that it has more than one hundred thousand fans in the world.

This compact and modern unit steadfastly withstands Russian operating conditions, so you can safely purchase it. The built-in plate heat exchanger has a wide range of modulations and prepares large volumes of hot water: it will be enough for a family of 3-4 people.

The control is intuitive, the instructions are clear, so you will quickly remember all the possible schemes of manipulations and settings. LCD display of medium size, with backlight, informative and convenient. Light weight and compact dimensions facilitate installation. The service life is long - 15 years, or even more. Resistant to voltage fluctuations. The primary heat exchanger is made of copper, the secondary is made of stainless steel. Mains voltage is single-phase. Works on liquefied and natural gas.

Specifications:

• weight: 28 kg;
• dimensions: 400x700x299 mm;
• thermal power: 5.40 - 12 kW;
• Efficiency: 92%.

2. Lemax Premium-16B

Already from the name it is clear that this boiler belongs to the group of premium equipment and can operate in a closed heating system with a working pressure of up to 3 atmospheres. No electrical connection required.Stainless steel 2 mm thick was chosen as the material of the heat exchanger: it endures all adverse external factors and has a long service life. Security automation is purchased from the Italian concern SIT.

The box is coated with anti-corrosion enamel, which can withstand temperatures up to 950°C, plus an inhibitory composition is applied, which reliably protects the walls from salt solutions and aggressive factors. The level of efficiency has been increased through the use of an innovative design and an increase in the heat exchange area.

The overheating protection system has been improved, and the level of protection against boiler blowing, soot formation and draft interruption has also been increased. The top panel is easily removed, so getting inside is easy. Factory warranty period is 3 years. The approximate area of ​​the heated room is 160 m2. If you look at the consumption of natural gas, then the figure is as follows: 0.95 m3 / h.

Specifications:

• WxHxD: 416x744x491 mm;
• weight: 60 kg;
• power: 16 kW.

Which firm to choose?

Popular firms:

• Viessmann is a popular German company whose products are ahead of competitors both in terms of safety and quality of control systems. There are many models, the quality of workmanship is high.
• The Vaillant Group company offers the user simple, but at the same time effective devices for a comfortable existence.
• The Italian company Baxi has been producing boilers for autonomous heating of residential premises for more than a decade, and its products have been sold in Russia for more than 20 years.Productive, economical, durable and comfortable models will serve you for many years.
• Navien - for 40 years of operation, the products of this company have gained popularity on all five continents, and in 2016 received the "Brand No. 1 in Russia" award in the "Heating equipment" category. Navien brand boilers are valued by consumers and professionals as reliable and technologically advanced products.

Useful video

In the video below you can find additional information about double-circuit gas boilers: