Top 10 best condensing gas boilers: rating 2021-2022 for reliability, advantages and disadvantages of models, tips for choosing

Condensing gas boilers have been gaining popularity for the last few years.

The article discusses the advantages and disadvantages of such a heating system, what to pay attention to when buying, and which models have received good ratings from owners.

Also, to help you in your choice, we have collected the rating of the best models, well proven among users.

Top 10 Best Condensing Gas Boilers 2021-2022 Rating

This ranking includes the best condensing gas boilers in terms of quality and reliability.

What to pay attention to when choosing?

When choosing a gas boiler, pay attention to the following aspects:

• Power. When selecting a condensing gas boiler, consumers use average values - on average, a room area of 10 square meters requires approximately 1 kW of heat. However, the basis for selecting the boiler power is the calculation of heat loss of the building, where the device is planned to be placed.
• Type of combustion chamber. Models with a closed combustion chamber provide minimum costs for the smoke exhaust system, since they have a fan that removes flue gases from the combustion chamber.
• The presence of circuits in this boiler. Heating equipment comes in two types: single-circuit and two-circuit.Single-circuit boiler works exclusively on the heating system. Two-circuit models simultaneously serve the heating system and several hot water outlets.
• Type of installation of the gas boiler. Floor-mounted are made of cast iron, they are more durable. Wall-mounted boilers are lighter and smaller in size, they save space during installation and have more complex automatics.
• Functionality. These include a variety of pressure and temperature regulators, remote control, protection and fuel economy system, the ability to connect the floor heating and various appliances.

The best two-circuit condensing boilers

BAXI Duo-tec Compact 24 20 kW

Two-circuit gas boiler "BAXI Duo-tec Compact 24" of the automatic type with a capacity of 20 kW to cope with The heating of premises with a total area of 200 sq. m. The boiler is mounted on the wall.

As fuel is used natural or liquefied gas. It is possible to connect the floor heating. The primary heat exchanger is made of stainless steel, which protects against corrosion, and the inner surface is less susceptible to the appearance of the layer of scum and sludge.

Includes circulation pump that pumps coolant through the heating circuit. The expansion tank maintains a constant pressure. To save fuel there is an auto ignition function that starts and extinguishes the burner according to a certain algorithm.

Characteristics:

• Maximum heat output - 20 kW.
• Control - electronic.
• Mains voltage - single-phase.
• Dimensions - 400x700x299 mm, weight - 34 kg.

Protherm Lynx 18/25 MKV 18 kW

The boiler is suitable for heating premises with an area of up to 180 sq. m. Mounted on the wall, using as a fuel natural gas. The primary heat exchanger is made of aluminum, which is considered a lightweight material and allows the manufacture of compact appliances.

However, over time, the efficiency of the boiler will be reduced due to fouling in the form of hydroxide and aluminum sulfate.

Constant pressure is ensured by a built-in expansion tank. The circulation pump, included in the package, ensures the transfer of the heating medium.

The burner is equipped with an auto-ignition function and the modulation of the burner allows you to change the intensity of the fuel supply, to reduce and increase the flame, thus saving costs.

The control is electronic, there is a display that displays all the information on the indicators, and connectors for the connection of additional devices.

Features:

• Maximum heat output - 18 kW.
• Control - electronic.
• Mains voltage - single-phase.
• Overall dimensions - 390x700x280 mm, weight - 35 kg.

BAXI LUNA Duo-tec MP 1.60 55 kW

Automatic two-circuit gas boiler heats rooms with a total area up to 550 sq. m.

Wall mounted, works on LPG and natural gas. It is possible to connect the floor heating. The primary heat exchanger is made of stainless steel, which significantly increases the service life of the boiler.

It is equipped with a circulation pump that moves the coolant throughout the heating circuit. The flame can be adjusted, reducing gas consumption. Auto ignition algorithm at the right time starts and extinguishes the burner.

The electronic way of control does not require constant monitoring by the user, but in case of power surges can fail. If the water temperature exceeds the allowable values, the protection against overheating is triggered.

Features:

• Maximum heat output - 55 kW.
• Control - electronic.
• Mains voltage - single-phase.
• Overall dimensions - 377x766x505 mm, weight - 40 kg.

BAXI LUNA Duo-tec MP 1.35 33.8 kW

Rooms up to 330 square meters. m. can be heated with an automatic gas boiler BAXI LUNA Duo-tec MP 1.35.

Control of the device is carried out electronically, on the body is a display.

The boiler works on two types of fuel: liquefied and natural gas. The primary heat exchanger is made of stainless steel, resistant to the formation of limescale. The kit includes a circulation pump.

The model has a deployed system of protection, which protects the pump from blocking during long idle time, overheating or freezing of the boiler, high pressure in the heating system and excess air.

The boiler must be run through a voltage regulator or UPS for uninterrupted operation.

Features:

• Maximum heat output: 33.8 kW.
• Control - electronic.
• Mains voltage - single-phase.
• Dimensions - 377x766x505 mm, weight - 40 kg.

Viessmann Vitodens 111-W B1LD031 35 kW

Designed to serve premises up to 350 sq.m. Primary heat exchanger of stainless Stainless steel primary heat exchanger, protected against corrosion, scaling and sludge. Works with two types of fuel in the form of natural and liquefied gas.

Includes circulation pump. Expansion tank compensates for the expansion of the coolant, keeping the pressure at a constant level.

The control is electronic, the manometer shows the pressure of the heating medium. If the flame goes out for any reason, the gas control system stops the fuel supply. Power supply needs a network of 220 volts with grounding.

The efficiency of the heater is rated high - in the range of 97.4%.

Characteristics:

• Maximum heat output - 35 kW.
• Control - electronic.
• Mains voltage - single-phase.
• Dimensions - 600x900x480 mm, weight - 64 kg.

The best single-circuit condensing boilers

Protherm Lynx 30 MKO 30 kW

The model is designed to serve the premises with a total area of up to 300 sq.m. Runs on natural gas, the primary The heat exchanger is made of light aluminum. There is a built-in expansion tank and circulation pump.

Fuel economy is carried out due to the auto ignition function (the burner is started and extinguished according to a certain algorithm) and modulation of burner flame - the user himself regulates the intensity of fuel supply, reduces or increases the flame.

Safety is controlled by systems of protection against overheating, freezing, pump blocking, gas control, safety valve and air vent.

Features:

• Maximum heat output - 30 kW.
• Control - electronic.
• Mains voltage - single-phase.
• Dimensions - 390x700x280 mm, weight - 36 kg.

BAXI LUNA Platinum+ 1.32 34.8 kW

Heats rooms with a total area up to 340 sq. m. Primary heat exchanger made of stainless steel, protected Protected against sludge, lime scale and corrosion.

Circulation pump pumps coolant, providing a closed heating system. Expansion tank maintains constant pressure.

Fuel is saved with burner flame modulation and auto ignition. The body has a digital display, a port for connecting additional equipment, a thermometer and a manometer. The boiler can be controlled by remote control.

A comprehensive safety system ensures maximum safety. Connection is allowed to 220 volts with grounding.

Characteristics:

• Maximum heat output - 34,8 kW.
• Control - electronic.
• Mains voltage - single-phase.
• Dimensions - 450x760x345 mm, weight - 37.5 kg.

Vaillant ecoTEC plus VU INT IV 346/5-5 30 kW

The model is designed to heat a room with a total area of up to 300 sq. m. The fuel used is two Natural gas and liquefied gas.

The primary heat exchanger is made of stainless steel, resistant to sludge, scale and corrosion.

Built-in circulation pump and expansion tank control the flow of coolant and constant pressure in the system. An advanced protection system ensures a high safety class.

Fuel economy is regulated by modulation of the burner flame and auto ignition. Control is electronic, the boiler is placed on the wall.

Characteristics:

• Maximum heat output - 30 kW.
• Control - electronic.
• Mains voltage - single-phase.
• Dimensions - 440x720x372 mm, weight - 36,9 kg.

BAXI LUNA Platinum+ 1.24 26.1 kW

Serves the premises with a total area up to 260 square meters. m. Control is electronic, can use the remote control. CONTROL BY REMOTE CONTROL. Built-in thermometer and manometer show temperature and pressure data.

Wall mounted, stainless steel primary heat exchanger, circulation pump included. The expansion tank maintains a constant pressure in the system. When connected to a voltage regulator or UPS, boiler operation is possible in case of power failure.

Burner flame modulation and auto ignition save fuel consumption. Operation is carried out on two types of gas: natural and liquefied.

Characteristics:

• Maximum heat output - 26,1 kW.
• Control - electronic.
• Mains voltage - single-phase.
• Overall dimensions - 450x760x345 mm, weight - 34,5 kg.

BAXI Duo-tec Compact 1.24 kW

Automatic gas boiler heats rooms up to 260 square meters. As the fuel suitable for natural and liquefied gas, modulation of burner flame and auto ignition saves consumption.

Primary heat exchanger of stainless steel, resistant to corrosion and scaling. The control is electronic, with a digital display on the housing showing the main indicators.

The built-in circulation pump and expansion tank optimize the operation of the boiler, move the coolant and ensure constant pressure in the system.

The power connection requires single-phase (220 volt) mains with grounding. If a voltage regulator or UPS is installed, the boiler continues to work even after a power outage.

Characteristics:

• Maximum heat output - 24 kW.
• Control - electronic.
• Mains voltage - single-phase.
• Dimensions - 400x700x299 mm, weight - 30 kg.

Principle of operation

Before installing such a device, it is not superfluous to learn about its principle of operation. Even an approximate idea of the processes that occur in it will help to avoid mistakes in use.

As fuel for the condensing boiler is used gas - natural (mains) and liquefied (in cylinders). In the process of combustion of fuel forms carbon dioxide and water, due to which a large amount of energy is released. As a consequence, the coolant (antifreeze or water) is heated - a liquid that moves along the pipes of the heating system.

Pros and cons

As with any technique, condensing gas boilers have their advantages and disadvantages, which should also be considered when choosing.

The pros of such boilers include:

• High efficiency - almost 15% higher than that of classic boilers;
• reliability of materials for the heat exchanger (stainless steel), extending the service life;
• low temperature of the exhausted gases, therefore, the use of a plastic chimney is allowed;
• Smaller size and power up to 100 kW, which is enough to heat the premises up to 1200 square meters;
• stable work on a small load;
• automation provides wide opportunities, much wider than the classic boilers.

The disadvantages are:

• the price of such boilers is 3-4 times higher than the classic devices;
• During operation, there is condensate with high pH, unsuitable for discharging into the sewer and requires the purchase of a neutralizer and control the availability of replacement type pellets.

What's the difference between a convection gas boiler?

Often at the time of choice, buyers have the question of what is the difference between convection and condensing gas boilers.

Condensing boilers have an additional heat exchanger, so that the products of combustion have a long escape route. Such a boiler accumulates the heat of the exhaust gases.

The cost of such devices is higher, the purchase of a condensate neutralizer is required. Installation of a condensing gas boiler does not always result in a payback, if we are talking about a small room.

In addition, such a boiler needs careful use, constant service, and in the case of breakage outside the warranty - the purchase of expensive spare parts.

Customer reviews

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How to choose a condensing gas boiler: