Top 20 best two-circuit gas boilers: price/quality rating 2021-2022

Autonomous heating - efficient and moderately budget-friendly, but only if you are satisfied if you buy a decent boiler. There are many units on the market, each has both pros and cons, price tags also differ by an order of magnitude. We can help you decide on the type and model of two-circuit gas boiler: just read our article and make your choice.

Rating of the best two-circuit gas boilers for 2021-2022

Location	Name	Price	Rating
Best two-circuit gas boilers by price/quality for 2021-2022
1	Viessmann Vitopend 100-W A1JB011	Check price	4.9 / 5
2	BAXI ECO-4s 24F	Ask the price	4.8 / 5
3	Neva Lux 7218	Check out the price	4.7 / 5
The best two-circuit wall hung gas boilers for apartments
1	Buderus Logamax U072-35K	Check out the price	4.9 / 5
2	Mizudo M24T	Check out the price	4.8 / 5
3	Lemax PRIME-V20	Learn the price	4.7 / 5
The best two-circuit gas boilers for a private home
1	Lemax Premium-30B	Learn the price	4.9 / 5
2	Konord AOGVK - 11,6-1	Learn more about the price	4.8 / 5
3	Siberia 23K	Learn more about the price	4.7 / 5
The best two-circuit gas boilers at 24 kW
1	Navien Deluxe S COAXIAL-24k	Learn the price	4.9 / 5
2	Buderus Logamax U052-24K	Learn more about the price	4.8 / 5
3	Viessmann Vitodens 050-W BPJC	Check out the price	4.7 / 5
The best energy independent two-circuit gas boilers
1	Lemax Premium-25B	Check out the price	4.9 / 5
2	FEDERICA BUGATTI ECO 32 TURBO	Check out the price	4.8 / 5
3	Ariston CARES XC 15 FF	Learn more about the price	4.7 / 5
The best two-circuit gas boilers with a combustion chamber
1	Buderus Logamax U072-28K	Learn the price	4.9 / 5
2	Bosch Gaz 6000 WBN 6000-18 C	Learn more about the price	4.8 / 5
3	Lemax PRIME-V32	Learn the price	4.7 / 5
The best budget two-circuit gas boilers
1	Buderus Logamax U072-12K	Learn the price	4.9 / 5
2	Lemax Premium-16B	Learn the price	4.8 / 5

How to choose a two-circuit gas boiler ?

• The power of the boiler: Approach your needs objectively. The optimal value varies from 17 to 35 kW. Start from the number of hot water intake points: the more of them - the more power should be more.
• Heat exchanger: Can be separate or bi-thermal. Separate has more advantages: first, the boiling of liquid in the system is excluded, and secondly, there is no scaling.
• Power regulation: One-stage, two-stage and three-stage. Two-stage is the most convenient: it is easier for the others to adapt to daily and seasonal changes in air temperature, the duration of operation is increased.
• The material of the heat exchanger: Can be made of steel, copper and even cast iron. Cast iron and heavy, and bulky, and poorly tolerate temperature changes, but in terms of service life with them no one can compare: 32-30 years. Steel is lighter, more resistant to temperature, but subject to corrosion. Copper is the best metal for heat dissipation characteristics. It weighs little, cools and heats quickly, has a high efficiency, serves 14-17 years.

Best two-circuit gas boilers by price/quality for 2021-2022

1. Viessmann Vitopend 100-W A1JB011

One of the best two-circuit gas boilers available on the domestic market. With its help you can heat a room of almost 300 square meters: just imagine the area!

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

You can connect an external control. Auto ignition and thermometer to control the temperature, there is a programmer and a manometer. Liquefied gas is used. Information is displayed on the handy display. The warranty is given for 2 years, service life - 15 years. The network voltage is single-phase, and the UPS or stabilizer is needed. The volume of the expansion tank is 10 liters. The boiler is mounted on the wall; it must not be placed on the floor. The safety valve (Viessmann Vitopend 100-W A1JB011) protects the system against excessive water pressure in the circuit in excess of the maximum allowable standard.

Technical characteristics:

• power: 29.9 kW;
• dimension: 450x725x360 mm;
• weight: 39 kg;
• max. heat output: 29.90 kW;
• max. heat load: 32.80 kW.

BAXI ECO-4s 24F

These boiler models stand out for their ease of installation, compactness and reliability. Each boiler has a hydraulic group of composite materials, a pair of separate heat exchangers for heating and DHW, as well as a turbine flow sensor (this sensor - a guarantee of comfort when using boiling water). Another major plus is the intuitive control interface, which provides advanced self-diagnostics and complete information about the operation of the unit.

There are brackets on the body to hang the unit. Ignition is electronic and smooth. A little effort with the settings - and the unit will be able to work on liquefied gas. The air supply system is polished to perfection (models with closed chambers). Stainless steel was chosen for the flame spreaders on the burners. Hydraulic group consists of composite materials. Can be connected to solar collectors. At the inlet of cold water is a filter.

Technical specifications:

• dimensions: 730x400x299 mm;
• Nominal inlet pressure of natural gas: 13-20 mbar;
• electric power/voltage: 130/230 W/V.

3. Neva Lux 7218

A good quality domestic boiler, which is worth talking about in detail. It is designed for DHW and heating, so for your home this device is enough, as they say, "more than enough". Built-in bitermic heat exchanger allows you to use it in apartment buildings. The total heated area is 180 square meters.

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

Technical characteristics:

• dimensions: 720x410x326 millimeters;
• mass: 34 kg;
• EFFICIENCY: 90%.

The best two-circuit wall mounted gas boilers for apartments

Buderus Logamax U072-35K

Model with a closed combustion chamber: reliable, efficient and durable, ideal for use in our country. The system withstands frequent pressure fluctuations in the gas mains, as well as surges electrical voltage. 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 output.

Operation with either LPG or natural gas is allowed. Ionization electrode helps control the flame, ignition is electronic. Heats a room of 110-240 m2. Anti-lock pump and flame sensor will make your life even easier and simpler. Noise level is low - about 36 dBA.

Specifications:

• dimensions: 485x700x315 mm;
• mass: 39 kg;
• allowable pressure of liquefied gas: 25 mbar;
• natural gas flow rate: 3.9 cubic meters/hour.

2. the Mizudo M24T

Another small model with an ergonomic design and simple control panel. The LCD display shows all the information you need in colors. Assembly is carried out in compliance with all rules and regulations, so Mizudo models stand out for their accuracy and well-fitting details.

Hydrogroup is made of brass, the primary heat exchanger is made of high quality copper with anti-corrosion coating. The fittings are also made of copper. Flame modulation is automatic. The device is resistant to corrosion and scale, protected from lack of draught, high pressure and stall of the flame. Overheating is not noted. It can work with liquefied gas. Warranty 3 years.

Technical specifications:

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

3. Lemax PRIME-V20

On the specialized website ExpertKotel.ru this model is described as reliable, powerful and easy to maintain, so we suggest you take a closer look at it. The model with an open chamber and two-circuit DHW will give heat and water at the same time. Floor installation, the rated power is 16 kW.

The primary heat exchanger is made of steel, the secondary is made of copper. The network voltage is single-phase, the expansion tank of medium volume (6). In the upper part of the body manufacturer has placed a display, there is a backlight, so that it was more convenient to use in the dark. The consumption of liquefied gas is small. Diagnostics is automatic, the built-in auto ignition is triggered. Indication of switching on is present.

Technical specifications:

• EFFICIENCY: 90%;
• Consumption of hot water at ?T = 30 ° C: 5 liters per minute;
• chimney: 130 mm;
• weight: 60 kg.

The best two-circuit floor standing gas boilers for a private house

Lemax Premium-30B.

Boiler with the highest level of efficiency and good functionality, designed for heating a room with a huge area: 300 square meters. The main "pluses" are also here: the gas control function, protection against overheating. Installation is floor standing, so you have to look for a special place for it.

Control is mechanical, i.e. through the 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. The diameter of the chimney is 130 mm. There are no algorithms for fuel saving electronic type, but you can get used to it.

Specifications:

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

2. Konord AOGVK - 11,6-1.

Installing this model in the room (with the observance of all indents from the walls), you get a reliable and faithful assistant, which will not leave you freeze even in the coldest time. The boiler runs on natural gas, consuming about 1.38 cubic meters per hour. In addition to heat, the unit gives and hot water: 3.3. liters per minute (temperature of liquid - within 30 degrees). Connecting to the power grid is not required. Heat transfer fluid circulates naturally, without pump.

The heat exchanger is made of steel: this material is light, durable, resistant to shocks and deformations. The control is mechanical, so there will not be a headache in case of breakage (touch panels are much more expensive to fix). The thermometer helps to control the temperature of the coolant in the boiler. Gas control function stops gas supply if the fire goes out for any reason. Exhaust gas efficiency not less than 85-90%.

Technical characteristics:

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

3. Siberia 23K

A series of gas boilers Siberia in quality and reliability is on a par with the famous European manufacturers. Model 32K is a combined unit designed for heating homes and hot water for household needs. Smoke is removed by the stove heating draught. 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, draught control). The burner is atmospheric (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 (of course, with proper maintenance and care).

Technical specifications:

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

The best two-circuit gas boilers 24 kW

Navien Deluxe S COAXIAL-24k

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

There is a small display on the body, the remote control is included. The heated area - 240 sq.m. Efficiency level - 91.4%. The voltage of the network is single-phase. The circulation pump is built in, there is an expansion tank. Easy to remove components (secondary heat exchanger, three-way valve and hydrogroup nodes). Special upgraded SMPS-chip protects the controller from voltage fluctuations.

Technical specifications:

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

2. Buderus Logamax U052-24K

Buderus is technology, proven in time. The manufacturer does not use fundamentally new solutions in its models, but tries to be as responsible to the choice of materials, controls the assembly and in general - has long been loved by a huge mass of people just for the decent attitude to business. A closed combustion chamber and good assembly will provide you with both heat and hot water. And the boiling water will flow not only in 4 independent loops, but also in the system "warm floor".

Works well in the mode with a constant temperature of the coolant or in weatherproof mode with adjustable power from 7.8 kW to 28 kW. Adjustment is simple, the temperature can be set using a pair of knobs. The display shows the actual temperature. Large selection of accessories for ventilation ducts and chimneys. Installation is fast, maintenance is convenient, commissioning is hassle-free and can be done alone.

Technical specifications:

• weight without packaging (kg): 40;
• maximum pressure in the DHW circuit (bar): 10;
• volume of the expansion tank (l): 8;
• outlet temperature (°С): 40-60;
• chimney connection (mm): 60/100.

3. Viessmann Vitodens 050-W BPJC

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

The cylindrical infrared burner not only ensures maximum combustion completeness, but also reduces CO2 emissions into the atmosphere (this shows that the manufacturer is trying to respect the nature). The power range is 6.5 - 24 kW. Energy efficiency class is high, both liquefied and natural gas is used as fuel. Control is simple, there is an LCD display. The fan is a built-in exhaust fan.

Technical specifications:

• Coaxial chimney diameter: 60/100 mm;
• dimension: 400x707x350 mm;
• weight: 35 kg.

The best energy-independent two-circuit gas boilers

Lemax Premium-25B.

Buying Premium-25B from the domestic brand Lemax you are sure not to throw away your money in vain. This boiler with an open combustion chamber without a "hitch" works in a closed heating system with operating pressure up to 3 atmospheres. There is no need to look frantically for a socket during repairs: it does not require connection to the power grid.

High-class steel of 2 mm thickness reliably preserves the internal system. Some of the parts are Italian, which means quality and reliability. Special coating (anti-corrosive enamel) plus inhibiting composition protects the heat exchanger from the aggressive effects of salts and other external factors. There is protection against overheating and blowing out the boiler, the system is also protected from soot formation and interruption of draft. Efficiency is high. Heats approximately 250 square meters.

Technical characteristics:

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

2. FEDERICA BUGATTI ECO 32 TURBO

One of the most functional - and the most expensive, alas! - energy-independent two-circuit gas boilers. This high-tech and modern (and we do not just mean appearance) unit has one of the biggest warranties: five years. It can be attached to the wall, as well as hidden in a niche or cupboard.

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

Flame modulation is electronic, installed intelligent protection system. The diagnostic system is automatic. The components 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. It is possible to connect a room regulator. Country - Turkey.

Technical Specifications:

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

3. Ariston CARES XC 15 FF

Is it worth paying attention to the two-circuit gas boiler Ariston CARES X 15 FF NG? We heartily recommend to do it! The traditional type wall mounted boiler works on natural gas and serves for 8-10 years, often longer. What is inside it? A built-in expansion tank, circulation pump and 3-way valve. The number of cycles is reduced compared to its predecessor, which had a positive impact on the service life.

Intuitive operation will not give you any trouble. Voltage - 230 V, frequency - 50 Hz. Country-manufacturer - Italy. Length of electrical cable - one and a half meters. The display is LCD with a pretty backlight. The thermostat and thermostat-programmer will help to keep 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.

Technical specifications:

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

The best two-circuit gas boilers with closed combustion chamber

Buderus Logamax U072-28K

This boiler is not afraid of neither voltage fluctuations, or pressure surges, or difficult environmental conditions - it is resistant as a tin soldier, and reliable as a Swiss watch. Compact, modern and ergonomic device for you and your family. 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. П

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. The control is simple and intuitive, the operating parameters are entered quickly.

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

Technical characteristics:

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

2. Bosch Gaz 6000 WBN 6000-18 C

You already know the brand Bosch and for sure you like the technology of this brand with worldwide reputation. Wall mounted boiler, working on gas, will heat an apartment, office and a small house. Dual circuit design (i.e., the device gives you both heat and hot water), the combustion chamber is closed, with forced smoke exhaust, the flame modulation is regulated electronically.

The heated area is 180 square meters. Air enters the working chamber through the coaxial chimney. Liquid crystal display shows the data. It is possible to control the settings by means of the button panel. Room thermostat can be connected. The minimum temperature of hot water is 40 degrees, the minimum - 60 degrees. To start the boiler for the first time you will need only 10 minutes. If desired, the system can be reconfigured for liquefied gas.

Technical specifications:

• warranty: 24 months;
• Brand Country: Germany;
• production: Russia;
• mass: 32 kg;
• Revision: 700x400x299.

Lemax PRIME-V32.

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

The assembly is of high quality, the materials are good. 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 operation at a pressure of 2 atm (in closed systems). The casing material is thick steel with increased flatness. Aggressive factors such as mineral oils and saline solutions are not hazardous to the unit.

Allowed the use of liquefied gas. The efficiency is increased, also the primary and secondary air inlets are increased. The boiler meets all basic safety and environmental requirements. The top cover can be removed for cleaning inside the box. Heat exchanger overheating sensor is installed. It is placed on the floor.

Technical characteristics:

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

The best budget two-circuit gas boilers

Buderus Logamax U072-12K

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

This compact and modern unit withstands Russian conditions, so you can safely buy it. The built-in plate heat exchanger has a wide range of modulation and makes boiling water in a large volume: it will be enough for a family of 3-4 people.

Control is intuitive, the instructions are clear, so you will quickly remember all the possible schemes of manipulation and settings. LCD-display is medium-sized, backlit, informative and handy. Low weight and compact dimensions make installation easy. Service life is long - 15 years or even more. Resistant to voltage fluctuations. The primary heat exchanger is made of copper, the secondary - of stainless steel. Mains voltage - single-phase. Operates on liquefied and natural gas.

Technical characteristics:

• weight: 28 kg;
• dimensions: 400x700x299 mm;
• Thermal capacity: 5.40 - 12 kW;
• EFFICIENCY: 92%.

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 an operating pressure up to 3 atmospheres. Connection to the power grid is not required. The material of the heat exchanger was chosen stainless steel with a thickness of 2 mm: it is resistant to all adverse external factors and has a long service life. Safety automation is purchased from the Italian concern SIT.

The box is covered with anti-corrosion enamel, which can withstand temperatures up to 950 ° C, plus an inhibiting composition, which reliably protects the walls from saline solutions and aggressive factors. Efficiency level is increased by using an innovative design and increasing the heat exchange area.

The system of protection against overheating is improved, as well as the level of protection against blowing out of the boiler, soot formation and interruption of draught. The top panel is easy to remove, so it's easy to get in. The factory warranty period is 3 years. Approximate area of heated premises - 160 m2. If you look at the consumption of natural gas, the figure is as follows: 0.95 m3/h.

Technical specifications:

• WxHxG: 416x744x491 mm;
• mass: 60 kg;
• power: 16 kW.

Which company should I choose?

Popular firms:

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

Useful video

In the video below you can find more information about two-circuit gas boilers: