TOP 10 best condensing gas boilers: 2024-2025 reliability rating, advantages and disadvantages of models, selection tips

Over the past few years, condensing gas boilers have been gaining popularity.

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

Also, to help you in choosing, we have compiled a rating of the best models that have proven themselves among users.

Rating of the TOP 10 best condensing gas boilers 2024-2025

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

What to look for when choosing?

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

• Power. When choosing a condensing gas boiler, consumers use average values ​​​​- on average for a room area of ​​​​10 square meters. m. requires approximately 1 kW of heat. However, the selection of the boiler power is based on the calculation of the heat losses of the building where the device is planned to be placed.
• Combustion chamber type. Models with a closed combustion chamber provide minimal costs for the smoke exhaust system, as they have a fan that removes flue gases from the combustion chamber.
• The presence of circuits in this boiler. There are two types of heating equipment: single-circuit and double-circuit. A single-circuit boiler works exclusively for the heating system. Double-circuit models simultaneously serve the heating system and several points of hot water draw-off.
• Type of installation of a gas boiler. The floor ones are made of cast iron, they are more durable. Wall-mounted ones are lighter and smaller in size, save space during installation, and have more complex automation.
• Functional. This includes various pressure and temperature regulators, remote control, a system for protecting and saving fuel consumption, the ability to connect a heated floor and various devices.

The best double-circuit condensing boilers

BAXI Duo-tec Compact 24 20 kW

The double-circuit gas boiler "BAXI Duo-tec Compact 24" of automatic type with a power of 20 kW copes with space heating with a total area of ​​200 sq. m. The boiler is installed on the wall.

Natural or liquefied gas is used as fuel. It is possible to connect a warm floor. The primary heat exchanger is made of stainless steel, which protects against corrosion, and the inner surface is less prone to the appearance of a layer of scale and sediment.

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

Characteristics:

• The maximum thermal power is 20 kW.
• Management is electronic.
• Mains voltage is single-phase.
• Dimensions - 400x700x299 mm, weight - 34 kg.

Protherm Lynx 18/25 MKV 18 kW

The boiler is suitable for space heating up to 180 sq. m. Placed on the wall, used as fuel natural gas. The primary heat exchanger is made of aluminium, which is considered to be a lightweight material and allows compact units to be made.

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

Constant pressure is ensured by the built-in expansion tank. The movement of the coolant is provided by the circulation pump, which is included in the kit.

The auto-ignition function is built-in, and the burner modulation allows you to change the intensity of the fuel supply, reduce and add the flame, thereby saving costs.

Electronic control, there is a display that displays all the information on indicators, and connectors for connecting additional devices.

Characteristics:

• The maximum thermal power is 18 kW.
• Management is electronic.
• Mains voltage is single-phase.
• Dimensions - 390x700x280 mm, weight - 35 kg.

BAXI LUNA Duo-tec MP 1.60 55 kW

An automatic double-circuit gas boiler heats rooms with a total area of ​​​​up to 550 square meters. m.

Wall mount, runs on liquefied and natural gas. Connection of a heat-insulated floor is allowed. The primary heat exchanger is made of stainless steel, which significantly increases the service life of the boiler.

The kit includes a circulation pump that moves the coolant throughout the heating circuit. The flame can be adjusted to reduce gas consumption. The auto-ignition algorithm starts and extinguishes the burner at the right time.

The electronic control method does not require constant monitoring by the user, however, it can fail during power surges. If the water temperature exceeds the allowable values, the overheating protection is activated.

Characteristics:

• The maximum thermal power is 55 kW.
• Management is electronic.
• Mains voltage is single-phase.
• Dimensions - 377x766x505 mm, weight - 40 kg.

BAXI LUNA Duo-tec MP 1.35 33.8 kW

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

The device is controlled electronically, the display is located on the case.

The boiler runs on two types of fuel: liquefied and natural gas. Scale-resistant stainless steel primary heat exchanger.Comes with a circulation pump.

The model has a deployed protection system that protects the pump from blocking during long periods of inactivity, overheating or freezing of the boiler, increased pressure in the heating system and excess air.

For uninterrupted operation, the boiler must work through a voltage stabilizer or UPS.

Characteristics:

• Maximum thermal power: 33.8 kW.
• Management is electronic.
• Mains voltage is single-phase.
• Dimensions - 377x766x505 mm, weight - 40 kg.

Viessmann Vitodens 111-W B1LD031 35 kW

Designed to service premises up to 350 sq. m. Stainless steel primary heat exchanger steel, protected from corrosion, scale and sediment. Works with two types of fuel in the form of natural and liquefied gas.

The package includes a circulation pump. The expansion tank compensates for the expansion of the coolant, maintaining the pressure at a constant level.

Electronic control, pressure gauge shows the pressure of the coolant. When the flame is extinguished for any reason, the gas control system stops the fuel supply. The power supply needs a 220 volt network with grounding.

The efficiency of the heater is highly rated - within 97.4%.

Characteristics:

• The maximum thermal power is 35 kW.
• Management is electronic.
• Mains voltage is 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 service premises with a total area of ​​​​up to 300 square meters. m. Runs on natural gas, primary The heat exchanger is made of lightweight aluminium. There is a built-in expansion tank and circulation pump.

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

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

Characteristics:

• The maximum thermal power is 30 kW.
• Management is electronic.
• Mains voltage is single-phase.
• Dimensions - 390x700x280 mm, weight - 36 kg.

BAXI LUNA Platinum+ 1.32 34.8 kW

Heats rooms with a total area of ​​up to 340 sq. m. Primary heat exchanger made of stainless steel, protected from sediment, scale and corrosion.

The circulation pump pumps the coolant, providing a closed-type heating system. The expansion tank maintains a constant pressure.

Fuel is saved by modulating the burner flame and auto-ignition. A digital display is built into the case, there is a port for connecting additional equipment, a thermometer and a pressure gauge are installed. The boiler can be controlled with a remote control.

Deployed protection system provides maximum security. Connection is allowed to a 220 volt network with grounding.

Characteristics:

• The maximum thermal power is 34.8 kW.
• Management is electronic.
• Mains voltage is 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 square meters. m. Two types of gas: natural and liquefied.

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

Built-in circulation pump and expansion tank control the movement of the coolant and constant pressure in the system. The advanced protection system provides a high class of security.

Fuel economy is controlled by burner flame modulation and auto ignition. Electronic control, the boiler is placed on the wall.

Characteristics:

• The maximum thermal power is 30 kW.
• Management is electronic.
• Mains voltage is single-phase.
• Dimensions - 440x720x372 mm, weight - 36.9 kg.

BAXI LUNA Platinum+ 1.24 26.1 kW

Serves premises with a total area of ​​up to 260 sq. m. Electronic control, remote control is allowed DU. Built-in thermometer and pressure gauge show temperature and pressure data.

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

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

Characteristics:

• The maximum thermal power is 26.1 kW.
• Management is electronic.
• Mains voltage is single-phase.
• Dimensions - 450x760x345 mm, weight - 34.5 kg.

BAXI Duo-tec Compact 1.24 24 kW

The automatic gas boiler heats rooms up to 260 sq. m. Natural fuel is suitable and liquefied gas, burner flame modulation and auto-ignition saves consumption.

Primary heat exchanger made of stainless steel, resistant to corrosion and scale. Electronic control, on the body there is a digital display showing the main indicators.

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

To connect the power supply, you need a single-phase network (220 volts) with grounding. When installing a voltage stabilizer or UPS, the operation of the boiler continues even after a power outage.

Characteristics:

• The maximum thermal power is 24 kW.
• Management is electronic.
• Mains voltage is single-phase.
• Dimensions - 400x700x299 mm, weight - 30 kg.

Principle of operation

Before installing such a device, it will not be superfluous to find out about its principle of operation. Even a rough idea of ​​the processes that take place in it will help to avoid errors when using it.

As a fuel for the condensing boiler, gas is used - natural (main) and liquefied (in cylinders). During the combustion of fuel, carbon dioxide and water are produced, which releases a large amount of energy. As a result, the coolant (antifreeze or water) is heated - a liquid that moves through the pipes of the heating system.

Pros and cons

Like any technique, condensing gas boilers have their advantages and disadvantages, which must also be considered when choosing.

The advantages of such boilers include:

• high efficiency - almost 15% compared to classic boilers;
• reliability of materials for the heat exchanger (stainless steel), extending the service life;
• low temperature of the removed gases, therefore, the use of a plastic chimney is allowed;
• smaller dimensions and power up to 100 kW, which is enough to heat rooms up to 1200 square meters. m.;
• stable operation at low load;
• automation provides ample opportunities, much wider than classic boilers.

The cons are:

• the price of such boilers is 3-4 times higher than classic appliances;
• during operation, high pH condensate appears, which is unsuitable for draining into the sewer and requires the purchase of a neutralizer and control of the presence of replaceable type pellets.

What is the difference from a convection gas boiler?

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

Condensing boilers have an additional heat exchanger, so that the combustion products have a long discharge path. 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. Installing a condensing gas boiler does not always lead to payback when it comes to a small room.

In addition, such a boiler needs careful use, constant maintenance, and in the event of a breakdown not under warranty, the purchase of expensive spare parts.

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