TOP 20 best gas boilers: 2021 rating for a private home

For anyone who has decided to acquire a gas boiler for their home - a private house, a cottage, or is dealing with the heating system of an industrial premises, it will be useful to know what the operating principle of a gas heating boiler is and what heating devices are available.

Knowing the design of gas heating boilers, you can make the right choice of equipment and subsequently be theoretically savvy in its operation, know how you can achieve greater savings when using heaters, and also understand the possible causes of malfunctions of an existing boiler, and not treat it as a the mysterious "black box". As they say, informed is forearmed.

Rating of the TOP 20 best gas boilers of 2020-2021

Place	Name	Price
TOP 3 best gas boilers by price, quality and reliability
1	BAXI ECO-4s 24F 24 kW	Find out the price
2	Bosch Gaz 6000 W WBN 6000-24 C 24 kW	Find out the price
3	Lemax Premium-16 16 kW	Find out the price
TOP 3 best double-circuit gas boilers
1	BAXI ECO-4s 18F 18 kW	Find out the price
2	Buderus Logamax U072-12K 12 kW	Find out the price
3	Viessmann Vitopend 100-W A1JB010 24 kW	Find out the price
TOP 3 best single-circuit gas boilers
1	BAXI ECO-4s 1.24F 24 kW	Find out the price
2	Protherm Bear 40 KLOM 35 kW	Find out the price
3	Lemax Premium-10 10 kW	Find out the price
TOP 3 best wall-mounted gas boilers
1	Vaillant turboTEC plus VU 282/5-5 28.9 kW	Find out the price
2	Bosch Gaz 6000 W WBN 6000-35 C 37.4 kW	Find out the price
3	Lemax PRIME-V28 28 kW	Find out the price
TOP 3 best floor-standing gas boilers
1	Lemax Premium-30N 30 kW	Find out the price
2	Lemax Leader-25N 25 kW	Find out the price
3	BAXI SLIM 1.150 i 14.9 kW	Find out the price
TOP 3 best condensing gas boilers
1	Protherm Lynx 30 MKO 30 kW	Find out the price
2	Vaillant ecoTEC plus VU INT IV 346/5-5 30 kW	Find out the price
3	BAXI LUNA Platinum+ 1.32 34.8 kW	Find out the price
TOP 2 best energy-independent gas boilers
1	Lemax Patriot-12.5 12.5 kW	Find out the price
2	Lemax Premium-30B 30 kW	Find out the price

How to choose and what to pay attention to?

Choosing a gas boiler is a difficult process and often not immediate. Often, users are guided only by price, but this approach is fundamentally wrong.

When choosing a gas boiler, you should pay attention to such parameters as:

Heat exchanger material – the service life of the unit and thermal power directly depend on it;
Combustion chamber - atmospheric chambers require a chimney in the house, like some turbocharged options;
The number of circuits depends on the need for hot water supply;
Thermal power - if the indicator is insufficient, the heating of the room will be insufficient, and if there is excess, the street will have to be heated by regular ventilation;
Placement - some models are very demanding in terms of placement; for some units it is necessary to allocate a special boiler room.

Circulation pump operation

What the performance indicators of the circulation pump will be depends, first of all, on the power at which the boiler operates, and this device does not have much influence on the operation of the entire system. It is very important that the pipes through which the coolant circulates are made of high-quality material, for example, steel or good plastic.

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

BAXI ECO-4s 24F 24 kW

The convection model with a hot water supply and heating circuit has one of the best characteristics in terms of design reliability and productive capacity.

Small size and nice design allow you to place the device in living rooms or kitchens if necessary. The power of the unit is sufficient to heat a space of no more than 240 sq.m.

Thoughtful energy efficiency ensures the economic benefit of the boiler, and silent operation will not cause discomfort.

The automation of the unit minimizes the need for intervention and control, as well as a well-thought-out safety system.

Does not cause problems during installation and operation, control is intuitive. The quality of the design is ensured by components made in compliance with European standards. This is one of the highest quality models for 2021.

Specifications:

Type: convection;
Number of circuits: dual circuit
Thermal power limits: 9.30 - 24 kW;
Thermal load: 10.60 - 25.80 kW;
Combustion chamber type: closed;
Efficiency: 93%;
Control: electronic:
Placement: wall;
Heat exchanger: copper/stainless steel;
Tank volume: 6 l.

pros

efficiency;
build quality;
small sizes;
design;
easy to operate and install.

Minuses

dependent on electricity.

Bosch Gaz 6000 W WBN 6000-24 C 24 kW

Double-circuit model running on natural and liquefied gas . Lamellar copper

The heat exchanger allows you to heat water for domestic needs in a few seconds. It is worth noting that this is one of the best models of 2021.

The heat exchanger is not demanding on water quality, which expands the boundaries of use and allows the unit to be used in conditions of hard or artesian water.

High performance with minimal noise level is an additional advantage of the device; the output sound is no louder than the operation of a refrigerator or computer.

The provided “Eco” mode allows you to heat water only during withdrawal, which increases the efficiency of the boiler.

Built-in automation is modernized and integrated with external regulators and remote system control.

Specifications:

Type: convection;
Number of circuits: dual circuit
Thermal power limits: 7.20 – 24 kW;
Thermal load: 8 - 26.70 kW;
Combustion chamber type: closed;
Efficiency: 93.2%;
Control: electronic:
Placement: wall;
Heat exchanger: copper;
Tank volume: 8 l.

pros

efficiency;
stability;
silent operation;
design.

Minuses

expensive spare parts.

Lemax Premium-16 16 kW

A boiler unit with a relatively low power, designed to heat a space of up to 150 sq.m..

The single-circuit model with an atmospheric combustion chamber is equipped with a steel heat exchanger, the service life of which is about 12 years.

The manufacturer offers a warranty period of three years..

The boiler control is mechanical; the unit requires regular monitoring of operation.

Non-volatility allows the device to be used in conditions of difficult power supply.

The model is demanding in terms of placement, requires a high-quality chimney and exhaust hood, but at the same time it is adapted to the conditions of the Russian climate.

Specifications:

Type: convection;
Number of circuits: single circuit
Thermal power: 16 kW;
Combustion chamber type: open;
Efficiency: 90%;
Control: mechanical:
Placement: wall;
Heat exchanger: steel.

pros

reliability;
adequate price;
ease of use.

Minuses

mechanical control;
demands on the chimney.

Correct operation

The heat exchanger is washed depending on the water hardness.
Transportation, installation and operation of the heat exchanger device are described in detail in the instructions:

The heat exchanger is placed in the apparatus so that it has easy access for inspection and repair.
Start-up is performed at stable pressure and temperature. Do not increase the temperature faster than 10 degrees per minute or increase the pressure more than 10 bar per hour.
When filled with water, the air valves and valves behind the heat exchanger remain open. After the pump starts, they are closed. In this way, stable pressure is achieved.
You need to change the heating parameters smoothly. The slower this happens, the longer the seals and the heat exchanger itself will last.
The device needs to be cleaned periodically. The plate is cleaned directly in the frame, then the plates are removed and washed. Another method is possible: first removing and then cleaning the plates. It is not recommended to clean shell-and-tube machines. In case of complex blockages, the technician installs a plug.
Before restarting, check the condition of all gaskets. Pressure and temperature are set as at 1st start.

To avoid salt deposits, a filter is placed on the water pipe in front of the boiler entrance.

The best double-circuit gas boilers

BAXI ECO-4s 18F 18 kW

The convection-type model with wall mounting has compact dimensions, which allows the device to be installed in any room without a special boiler room..

Duration of use and operation is ensured by the quality of materials and assembly. The power of the unit allows you to heat a space with an area of up to 200 square meters.

However, installation of the boiler requires parts that are not supplied, which increases the total cost of the equipment compared to other models in the same price category.

The popularity of the boiler is ensured by its ease of installation and operation.

The model is automated, there is no need for regular monitoring by the operator, and the built-in automatic diagnostic system recognizes the error in time and stops the boiler operation until the operator intervenes and fixes the problem.

Specifications:

Type: convection;
Thermal power limits: 9.30 - 18 kW;
Thermal load: 10.60 - 20 kW;
Combustion chamber type: closed;
Efficiency: 92.5%;
Control: electronic:
Placement: wall;
Heat exchanger: copper/stainless steel;
Tank volume: 6 l.

pros

high efficiency rate;
low fuel consumption with high power;
ease of installation and management;
silent operation;
thoughtful security;
design.

Minuses

energy dependence;
high cost of components.

Buderus Logamax U072-12K 12 kW

Automatic model with a turbine chamber, operating on liquefied and natural gas.

Its compactness and pleasant design make it possible to install the boiler unit in the kitchen, and its silent operation allows it to be installed in a living room.

The equipment capacity is enough for an area of up to 120 sq.m..

Control is carried out using a simple and clear display, and the automatic system does not require regular monitoring of the operation of the unit.

It is energy dependent, but with an uninterruptible power supply and a 200 A*h battery, it can operate for 7 hours.

Specifications:

Type: convection;
Thermal power limits: 5.40 - 12 kW;
Combustion chamber type: closed;
Efficiency: 92%;
Control: electronic:
Placement: wall;
Heat exchanger: copper.

pros

appearance;
silent operation;
low fuel consumption;
simple controls.

Minuses

energy dependence.

Viessmann Vitopend 100-W A1JB010 24 kW

Wall-mounted boiler with a cylindrical gas burner located in the center of a spiral steel heat exchanger.

The model is configured at the factory; additional configuration is required only during installation and first start-up.

For maintenance, the manufacturer recommends contacting a service center.

The power of the device is enough to heat a room up to 200 sq.m..

During installation, the boiler does not require additional space and placement, which allows it to be installed anywhere and built into kitchen furniture.

It runs on natural and liquefied gas, the consumption does not exceed 3 cubic meters/hour, which makes the model economical.

Specifications:

Type: convection;
Thermal power: 24 kW;
Thermal load: 26.20 kW;
Combustion chamber type: closed;
Efficiency: 91%;
Control: electronic:
Placement: wall;
Heat exchanger: stainless steel;
Tank volume: 6 l.

pros

low fuel consumption;
protection of the chimney from freezing;
simple controls;
work on natural and liquefied gas.

Minuses

Efficiency

The best single-circuit gas boilers

BAXI ECO-4s 1.24F 24 kW

Single-circuit gas boiler with electronic control and sophisticated automation.

Integrates with a heated floor system and maintains temperatures up to 45 degrees.

In the heating system, the temperature is regulated from 30 to 85 degrees.

A well-thought-out safety system, including a closed combustion chamber and automatic diagnostics, high-quality assembly, and quality components ensure long-term operation of the boiler unit and reduce the need for regular repairs.

Installing and operating the boiler is hassle-free and does not require highly qualified skills.

However, the model has high fuel consumption, which reduces its efficiency compared to similar models in the price range and technical characteristics.

Specifications:

Type: convection;
Thermal power limits: 9.30 - 24 kW;
Thermal load: 10.60 - 25.80 kW;
Combustion chamber type: closed;
Efficiency: 93%;
Control: electronic:
Placement: wall;
Heat exchanger: copper;
Tank volume: 6 l.

pros

optimal price/performance ratio;
ease of installation and operation;
reliability and quality of components;
low noise level.

Minuses

not the most economically profitable.

Protherm Bear 40 KLOM 35 kW

One of the most reliable and unpretentious gas boilers of the Slovak brand . Factories

production is located in Russia, so the model is adapted to the climatic conditions of the country.

The floor-standing device is simple in design, non-volatile, which expands installation possibilities.

The control panel is located on top, covered with a special hinged lid.

The peculiarity of the model is the possibility of installation in rooms without a chimney - the design provides for the installation of a fan for the forced removal of combustion products.

The power of the device is sufficient to heat a room with an area of up to 350 sq.m..

Approved for use not only in residential, but also industrial, retail and office premises.

Specifications:

Type: convection;
Thermal power limits: 24.50 - 35 kW;
Thermal load: 27 - 38.50 kW;
Combustion chamber type: open;
Efficiency: 92%;
Control: electronic:
Placement: floor;
Heat exchanger: cast iron.

pros

cast iron heat exchanger;
reliability and simplicity of design;
availability of components;
possibility of modernization.

Minuses

flimsy casing.

Lemax Premium-10 10 kW

Electricity-independent unit equipped with a steel heat exchanger . Works

only on natural gas.

With a high efficiency indicator, it has low fuel consumption - 1.2 cubic meters / hour, which makes it very economical.

One of the best budget options for small spaces in terms of price and quality.

The model is not recommended for use in closed systems with operating pressure above 1 bar.

The model is also demanding on the chimney and maintaining the cleanliness of the device. If there is backdraft in the chimney, the burner flame goes out, despite the built-in protection against blowing out.

Specifications:

Type: convection;
Thermal power: 10 kW;
Combustion chamber type: open;
Efficiency: 92%;
Control: electronic:
Placement: floor;
Heat exchanger: steel.

pros

low cost;
compactness;
efficiency;
well-thought-out protection system;
silent operation.

Minuses

thin heat exchanger;
demands on the chimney.

Requirements for installing a coaxial boiler

The use of coaxial systems makes it possible to use a gas heat generator with a closed combustion chamber not only in private households, but also in multi-storey buildings. Regardless of where exactly the unit is installed, the following rules must be observed:

Since for installations with forced removal of combustion products, a vertical section of the chimney is not a necessary condition, it is advisable to exhaust it to the outside horizontally, through the wall closest to the unit;
The maximum permissible length of the coaxial exhaust gas exhaust system should not be more than 3 - 4 m;
The hole for the pipe outlet must be located at least 2 meters from the ground;
The chimney pipe must be located at a distance of one and a half meters from windows and doors; proximity to the exhaust hood intake window is unacceptable;
To ensure condensate removal, the coaxial system is installed at an angle of 3 - 5 0 to the horizon.

The best wall-mounted gas boilers

Vaillant turboTEC plus VU 282/5-5 28.9 kW

One of the best single-circuit boilers from the manufacturer . Turbocharged model with

increased noise insulation, built-in system autodiagnostics and thoughtful security.

Automated control does not require regular monitoring by the user.

The power of the device is enough to heat houses up to 250 sq.m..

Improved boiler performance is ensured by a built-in circulation pump and a closed expansion tank with a volume of 10 liters.

It is possible to connect a water heater to provide hot water.

It runs on natural and liquefied gas, but the consumption of the first is quite high - 3.2 cubic meters / hour.

Specifications:

Type: convection;
Number of circuits: single circuit
Thermal power limits: 9.40 - 28.90 kW;
Thermal load: 10.90 - 31.10 kW;
Combustion chamber type: closed;
Efficiency: 91%;
Control: electronic:
Heat exchanger: copper;
Tank volume: 10 l.

pros

nice design;
increased sound insulation;
ease of installation and maintenance;
thoughtful security system.

Minuses

high price.

Bosch Gaz 6000 W WBN 6000-35 C 37.4 kW

One of the most powerful Italian-made boilers, capable of handling an area of up to 350 sq.m..

High performance works both in relation to the heating system and the hot water supply - water at a temperature of 50 degrees is supplied in a volume of 9.6 l/min.

The gas consumption of the model is quite high - 4 cubic meters / hour, which is due to the power of the device.

Electronic control using a display; there is no need for regular monitoring of the system.

The device is equipped with protection against freezing, overheating, and does not allow the pump to block..

Optimal for large cottages, can also be used in technical or commercial premises.

Specifications:

Type: convection;
Number of circuits: double-circuit;
Thermal power limits: 12.20 - 37.40 kW
Heat load: 13.40 - 37.40 kW;
Combustion chamber type: closed;
Efficiency: 91%;
Control: electronic:
Heat exchanger: copper;
Tank volume: 10 l.

pros

high power;
high-quality assembly;
smart security system;
silent operation.

Minuses

Installation requires the assistance of service specialists.

Lemax PRIME-V28 28 kW

Domestic gas boiler with European components . Adapted

to the conditions of the Russian climate, designed taking into account temperature differences in some regions and critically low temperatures in the north.

Resistant to pressure changes in the system.

Equipped with electronic, intuitive controls with the ability to connect external control and monitoring devices via smartphone.

The company warranty is two years - the manufacturer is confident in the quality of the build.

The dual-circuit system will provide not only heating, but also hot water supply.

Specifications:

Type: convection;
Number of circuits: dual circuit
Thermal power limits: 11 - 28 kW;
Combustion chamber type: closed;
Efficiency: 92%;
Control: electronic:
Heat exchanger: copper;
Tank volume: 8 l.

pros

intuitive controls;
the ability to connect external control from a smartphone;
two-level electronics protection;
pressure indicators;
thoughtful security system.

Minuses

price.

Thermal control devices

To automatically regulate the operation of the boiler, many built-in devices are used.

A thermostat or programmer is responsible for regulating the temperature.

In simpler boiler models, the temperature is regulated by a thermoelement - a special device, which is a metal structure that can change size (shrink or increase) under the influence of temperature. When heating/cooling, the thermoelement changes size, acting on a lever located next to it that closes or slightly opens the draft damper. The volume of air entering the combustion chamber, in turn, depends on the thrust force, controlling the combustion process.

Advanced models are equipped with controllers that regulate air flow using a built-in fan. Thus, a thermostat can be a fairly simple or complex, and even programmable, device. Programmable thermostats - programmers - can control the implementation of specified settings for an entire week, taking into account the required temperature down to the minute.

Proper use of thermostat settings allows you to achieve savings on energy consumption of 20-30%, which will significantly reduce heating costs. Having reconsidered the need to purchase this device, you can buy a programmer for a gas boiler, even if you already have a boiler.

Programmers are devices that provide automatic temperature control. These devices can save energy consumption, provide the required indoor climate control and extend the life of heating equipment. You can regulate the water temperature in the heating system and the air temperature in the room. Standard water temperature control provides for manual or automatic switching on/off of the heating mechanism depending on the required water temperature in the radiator.

If it gets cooler or warmer outside, a different water temperature in the pipes is required and more and more adjustments have to be made. Such systems can be equipped with an electronic display and automatic adjustment. But the principle of their operation is to constantly bring the system into a mode in which the desired water temperature is achieved by turning the boiler on/off every few minutes. In this mode of constant readiness to turn on the burner, the pump runs constantly. This wears out the equipment.

A more justified option is a programmer that controls the temperature of the air in the room, rather than the water in the pipes, when the desired comfortable temperature is set and the boiler is controlled, also turning it on and off, while starting and turning off the pump only when the air temperature change sensor is triggered. The air cools and heats up more slowly, so starts occur less frequently, which minimizes energy costs and reduces equipment wear. Those who want to get more significant savings and a comfortable temperature buy a room programmer for a gas boiler; they are widely represented on the market.

The best floor-standing gas boilers

Lemax Premium-30N 30 kW

Convection unit capable of heating a room of 250-300 square meters.

The manufacturer abandoned complex electronics, leaving only the updated 820 NOVA SIT automation with a more advanced thermostat.

Despite the minimal set of functions, the security system is very well thought out, and its energy independence allows you to install the device where there are regular power outages.

Low fuel consumption ensures the efficiency of the device at high power levels and heating the coolant up to 90 degrees.

However, to maintain the operating temperature of the boiler, constant monitoring by the operator is required.

Specifications:

Type: convection;
Number of circuits: single-circuit;
Thermal power: 25 kW;
Combustion chamber type: open;
Efficiency: 90%;
Control: mechanical:
Heat exchanger: steel.

pros

build quality;
power;
efficiency;
overheat protection.

Minuses

mechanical control;
need for control.

Lemax Leader-25N 25 kW

Non-volatile boiler unit with a cast iron heat exchanger, resistant to corrosion .

The model is equipped with perfect automation with the ability to connect external control and a thermostat indicating temperatures.

Due to the high operating pressure, connection to closed systems is possible.

The device is sensitive to the chimney and requires maintenance, and also does not have the highest quality fasteners.

Not the most functional, but at the same time easy-to-use model, suitable for heating rooms up to 150 sq.m.

Specifications:

Type: convection;
Number of circuits: single-circuit;
Thermal power: 25 kW;
Combustion chamber type: open;
Efficiency: 90%;
Control: mechanical:
Heat exchanger: cast iron.

pros

ease of use;
long warranty period;
high working pressure;
original Italian components.

Minuses

price;
low quality fasteners.

BAXI SLIM 1.150 i 14.9 kW

A single-circuit boiler unit with an atmospheric combustion chamber allows heating rooms up to 140 sq.m..

The cast iron heat exchanger is highly durable, but is intolerant to sudden temperature changes.

The fuel consumption of the device is very low - no more than 2 cubic meters / hour, which ensures the efficiency of the boiler.

With this ratio, it is ideal for small houses and cottages. Control is carried out using the display, it is possible to connect a remote control.

Automation of the system reduces the need to monitor the device.

At the same time, the unit is sensitive to voltage changes.

When using a UPS with a battery capacity of 200 Ah, the device’s autonomy is maintained for 13.5 hours.

Specifications:

Type: convection;
Number of circuits: single-circuit;
Thermal power limits: 8.50 - 14.90 kW;
Thermal load: 9.50 - 16.50 kW;
Combustion chamber type: open;
Efficiency: 90%;
Control: electronic:
Heat exchanger: cast iron;
Tank volume: 10 l.

pros

high-quality protection system;
ease of operation;
possibility of connecting a remote control;
low fuel consumption and efficiency.

Minuses

energy dependence;
average efficiency.

Material of manufacture

The heat exchanger for the boiler is made from durable materials that conduct heat well, are not prone to corrosion and are sufficiently resistant to pressure. Since the cost of the material also has to be taken into account, the choice is limited.

Steel

A steel heat exchanger is cheaper in price, but less durable.
This is the most affordable material. Steel is very strong, but can be processed well. The price is low. The advantage of this option is resistance to high temperatures. Steel is plastic and does not crack when heated, and does not deform even in areas in contact with the burner.

A steel heat exchanger for a solid fuel or gas boiler is prone to corrosion. Water inside the tubes and combustion products in the boiler chamber have a destructive effect on the material. This affects durability. The steel model weighs a lot, which leads to additional fuel consumption for heating the element itself.

The stainless steel heat exchanger is resistant to corrosion and lasts for at least 50 years.

Cast iron

The material is much more resistant to corrosion than steel, and is not afraid of rust and the action of acid anhydrides. The service life reaches 50 years. However, cast iron is a brittle alloy and can crack under the influence of temperature. To avoid damage, the cast iron tubular heat exchanger must be washed: if ordinary water is used, then once a year; if antifreeze - then once every 2 years; if distilled liquid - once every 4 years.

The weight of a cast iron element is even greater, so more fuel and time have to be spent on heating.

Copper

Copper is a noble metal that is not susceptible to any type of corrosion. It is chemically inert and tolerates pressure well. Copper conducts heat better, so less fuel is required to heat the element itself and the flowing liquid. The weight of the copper model is small, the dimensions are compact with a very developed working surface.

The disadvantage is the high price. Also, the copper heat exchanger is too sensitive to heating to high temperatures. More often found in boilers from foreign manufacturers.

Copper

Cast iron

The best condensing gas boilers

Protherm Lynx 30 MKO 30 kW

Models of the brand and this line have long replaced classic boilers in Europe . Despite

Despite the fact that the line was first released back in 2002, it still remains relevant due to its affordable price, pleasant design, rich equipment and high-quality components.

The boiler runs on natural gas.

Despite the fact that the model is a condensation model, there is no need for a chimney - the design provides for the forced removal of combustion products.

Low fuel consumption ensures the efficiency of the unit.

A well-thought-out security system, an automatic control system, and the ability to connect external control are the main advantages of the model that determine its popularity.

Specifications:

Thermal power limits: 7.10 – 30 kW;
Thermal load: 7.20 - 30.60 kW;
Combustion chamber type: closed;
Efficiency: 104%;
Control: electronic:
Placement: wall;
Heat exchanger: aluminum;
Tank volume: 8 l.

pros

thoughtful security;
protection against overheating and freezing;
affordable price compared to competitors;
design.

Minuses

installation requires highly qualified specialists.

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

A German boiler unit with high thermal power is capable of heating a room up to 350 sq.m..

High efficiency is due to the recovery of heat from the released combustion products.

Design features allow the unit to be used on low-temperature heating systems.

The device is equipped with intuitive control using a display, a built-in pump, and an adjustable fan.

It features a stylish design, high-quality assembly and silent operation, but is volatile, and for optimal operation an uninterruptible power supply with a voltage stabilizer is required.

Specifications:

Thermal power limits: 5.80 – 30 kW;
Thermal load: 6.20 - 30.60 kW;
Number of circuits: single-circuit;
Combustion chamber type: closed;
Efficiency: 107%;
Control: electronic:
Placement: wall;
Heat exchanger: stainless steel;
Tank volume: 10 l.

pros

efficiency;
build quality;
reliability of design;
appearance.

Minuses

a voltage stabilizer is required;
high price.

BAXI LUNA Platinum+ 1.32 34.8 kW

A high-quality gas boiler with a clear advantage in the form of integration with solar panels and heat pumps - not all models, even with a higher price tag, can boast of such a function.

Adaptable to fuel, heating system design and chimney. Management will not be difficult even for those who have not previously encountered such equipment, due to the intuitiveness and automation of settings.

Economical due to high efficiency and fuel consumption.

However, the design features are not designed for use at critically low temperatures - the chimney freezes due to the release of cold gas when combustion products are released.

Specifications:

Type: condensing;
Thermal power limits: 3.20 - 34.80 kW;
Combustion chamber type: closed;
Efficiency: 106%;
Control: electronic:
Placement: wall;
Heat exchanger: stainless steel;
Tank volume: 10 l.

pros

high level of security;
high efficiency indicators;
efficiency;
multifunctionality;
integration with other heating sources.

Minuses

price;
rarity on the market;
not recommended for installation in regions with prolonged and severe cold.

The best non-volatile gas boilers

Lemax Patriot-12.5 12.5 kW

Compact device with a turbocharged combustion chamber and parapet placement.

Economical, with low natural gas consumption due to low power.

The control is mechanical, but does not cause difficulties.

The protection system consists of gas control and overheating protection.

Can be used without a chimney. Capable of heating a room up to 100 sq.m., optimal for small houses.

Among the complaints is one of the lowest efficiency indicators for gas boilers and the possibility of purchasing more efficient equipment in the same price category.

Specifications:

Type: convection;
Number of circuits: single circuit
Thermal power: 12.50 kW;
Combustion chamber type: closed;
Efficiency: 87%;
Control: mechanical:
Placement: parapet;
Heat exchanger: steel.

pros

ease of installation;
energy independence;
no need for a chimney.

Minuses

low efficiency.

Lemax Premium-30B 30 kW

Floor-standing model with mechanical control and atmospheric combustion chamber . Works

Autonomous, does not require power from electricity.

Provides hot water supply at a speed of 8 l/min. Fuel consumption in the form of natural gas is 3.5 cubic meters/hour - not the most economical option.

Optimal for rooms with an area of 250-300 sq.m. The device is made in Russia and is therefore optimized for the harsh realities of the climate.

Due to the increased power and design of the combustion chamber, the device is quite noisy, so it is recommended to allocate a separate room for it.

Specifications:

Type: convection;
Number of circuits: dual circuit
Thermal power: 30 kW;
Combustion chamber type: open;
Efficiency: 90%;
Control: mechanical:
Placement: floor;
Heat exchanger: steel.

pros

performance;
smooth start;
protection against blowing.

Minuses

high fuel consumption;
noisy work.

Types of gas boilers

There are several classifications of boiler units that may overlap with each other. The types of boilers can be distinguished by the number of circuits, installation, type of power supply, combustion chamber and method of heat transfer.

According to the method of heat transfer, they are distinguished:

condensation , in which the coolant is prepared with thermal energy obtained by condensing moisture from the exhaust gas of combustion products;
convection - heat is transferred by a gas burner and heating a heat exchanger.

By number of circuits:

single-circuit - intended only for heating the room through the heating system;
double-circuit - additionally heats water for hot water supply.

By installation:

wall;
floor;
parapet.

By energy dependence:

volatile - require an uninterruptible power supply;
non-volatile - work on a mechanical principle.

By type of combustion chamber:

atmospheric (open) - air comes from the room and is removed through the chimney;
turbocharged (closed) – air is supplied using a turbofan.

Single-circuit or double-circuit gas boiler - what to choose?

The choice of one or two circuits when purchasing a gas boiler depends on the needs of the users.

If there is a need for constant availability of hot water at home (for example, in principle there is no hot water supply), you should give preference to dual-circuit models.

When connecting houses to hot water supply - even with regular shutdowns for the period of pressure testing - it is worth choosing a single-circuit model, and, if necessary, equipping it with a boiler.

Double-circuit models consume more fuel, are less economical and more demanding to install, in addition, their price is often higher than single-circuit options.

Possible faults

Steel products are subject to corrosion and must be replaced.
Most problems require the intervention of specialists. Some can be eliminated by the user:

Reduced pressure - if caused by contamination, it is enough to clean the heat exchanger. If the connection to the network is incorrect, you need to check the connection with the drawing in the instructions.
Reduced efficiency - in case of mechanical contamination, the device is washed. If the reason is the accumulation of oil or substandard gases, additional devices are installed to remove them.
Leakage - most often caused by decomposition of seals. They are being replaced.
Mixing of working media - occurs when plates or tubes corrode. The plates can be partially replaced, but a new shell-and-tube heat exchanger will have to be installed.

While the warranty is valid, it is prohibited to open the heat exchanger yourself and carry out any repairs.

How to choose the power of a gas boiler

Power is one of the main indicators that you should pay attention to. In order not to overpay for extra watts, you need to choose the right boiler with the appropriate indicator.

The simplest calculation is 1 kW per 10 square meters of room.

The optimal method for buildings with good thermal insulation and double glazing.

For ceilings up to 3 m high, you can get by with another simple method - the area of the housing is multiplied by the region coefficient, the total is divided by 10.

For different regions, the coefficient is slightly different - for the southern region it is 0.8, for the middle zone - 1.1, for the northern regions - 1.7, for the far north - 2.

More complex formulas include calculating the volume of the room, taking into account the coefficients of thinness and materials of walls, roofs, the presence of heated floors and other factors, but they are mainly intended for professionals.

Which manufacturer is better?

The Russian market is dominated by imported models, the best of which are considered to be German, Italian and South Korean models..

In any case, when choosing a device, preference should be given to well-known companies (despite the presence of the so-called “brand fee”).

Some of the best suppliers of gas boilers, according to experts, are:

Vaillant is a German brand known for the reliability of its designs and the quality of its components;
Baxi is an Italian company known for quality products;
Protherm is a Slovak company with factories in Russia;
Lemax , a Russian brand with factories in China, supplies the market with boilers with an affordable price and acceptable power.

conclusions

All existing models of domestic gas boilers are capable of satisfying the necessary minimum needs of home occupants. The choice of boiler type should be tied primarily to the needs and operating conditions, so you should not purchase an overly powerful unit - a large supply of power will remain unclaimed. However, a low-power home boiler that does not meet the requirements is a waste of money.

At the same time, the price of the unit is not the least important criterion. Buying cheap equipment is fraught with frequent failures and will ultimately result in high costs for a low-quality boiler, so you should choose a device in the middle price range, the functionality and quality of products in which often differs from top models only in the absence of one or two rarely used options.

Electric or gas boiler – which is better?

Disputes between supporters of gas and electric boilers still do not subside . It is impossible to say unequivocally about the advantages of the devices - it all depends on the specific situation, the state of the electrical networks, the availability of a connection or the possibility of connecting to the gas main and many other factors.

The main argument in favor of gas boilers is the difference in the cost of gas and electricity, deterioration of electrical networks, especially in remote areas.

However, gas boilers are several times more expensive than electric boilers in terms of cost, which includes not only the cost of the boiler itself, but also installation and maintenance fees.

Circular pump factor

Don't forget about the circulation pump factor. More precisely about the final brand that produces these pumps. For European boilers, everything is quite simple: most often they install Grundfos and Wilo brand pumps into their boilers. Other manufacturers equip gas boilers with incomprehensible pumps. And there are such pumps in gas boilers that are quite good, but there are others that are not so good. Grundfos have proven themselves well; their pumps are very durable. A Grundfos brand pump is an indicator of a good quality gas boiler boiler. If you see a pump of an unknown brand in a boiler, it is worth considering whether you need such a boiler, but again you need to take into account the other factors that we are talking about.

The Italtherm City Class boiler uses a hydraulic group with a Grundfos pump