TOP 12 best single-circuit gas boilers: rating 2024-2025 and which one to choose for heating a private house

In gasified regions of the country, gas boilers are recognized as efficient and economical sources of heat.

When arranging an autonomous heating system in a private house or in a country house, it is quite enough to install a device with one heating circuit, designed specifically for space heating.

The rating of single-circuit gas boilers 2024-2025 helps to choose the best model from numerous offers.

Rating of the TOP-12 best single-circuit gas boilers 2024-2025

Place	Name	Price
TOP 4 best single-circuit gas boilers
1	Lemax Patriot-12.5	Ask for a price
2	Lemax Patriot-10	Ask for a price
3	BAXI ECO-4s 1.24F	Ask for a price
4	Protherm Panther 25 KTO (2015) 25 kW	Ask for a price
TOP 4 best single-circuit wall-mounted gas boilers
1	Vaillant turboTEC plus VU 282/5-5 28.9 kW	Ask for a price
2	Lemax Premium-30N 30 kW	Ask for a price
3	Lemax Leader-25N 25 kW	Ask for a price
4	BAXI LUNA Platinum+ 1.24 26.1 kW	Ask for a price
TOP 4 best single-circuit floor gas boilers
1	Lemax Wise 25 25 kW	Ask for a price
2	Lemax Wise 16 16 kW	Ask for a price
3	BAXI SLIM 1.150 i 14.9 kW	Ask for a price
4	Protherm Bear 30 PLO 26 kW	Ask for a price

What should you pay attention to when choosing

When choosing a single-circuit gas boiler, the following basic criteria should be taken into account:

The main characteristic is thermal power. When choosing an apparatus, it is assumed that for heating 10 m² The premises require a power of 1 kW.
Combustion chamber type. There are open and closed chambers.
Possibility of connecting a boiler for heating water.
Control system. The boilers may have a mechanical or electronic system.
Safety. The boiler must be equipped with a reliable system for monitoring pressure, temperature, overvoltage and automatic shutdown in case of an emergency.
For selection, you need to take into account a number of parameters: the area of \u200b\u200bthe room, the height of the ceilings, the presence of a ventilation system, the heat-insulating ability of the walls.
It is determined by the gas flow rate and the ability to maintain the optimal mode.

When choosing a device, it is important to pay attention to the manufacturer.

High reliability, quality and safety are distinguished by gas boilers from companies such as BAXI, Buderus, Vaillant, Navien, Bosch, Protherm, Ariston.

The best single-circuit gas boilers

Below is the TOP-4 of the best single-circuit gas boilers, compiled taking into account the opinions of consumers and specialists in 2024-2025. The main evaluation criteria are price, quality and reliability.

Lemax Patriot-12.5

The Lemax company offers a reliable single-circuit convection-type boiler Lemax Patriot-12.5 for space heating up to 120 m2².

It does not depend on the supply of electricity. Closed combustion chamber. Mechanical control.

Installation - parapet.

Rectangular heat exchanger is made of 2 mm stainless steel and complies with European standard.

It is covered with a special enamel that prevents corrosion. There is a gas control and protection against overheating.

A coaxial type smoke exhaust system is provided, and therefore there is no need for a stationary chimney. This is one of the highest quality models for 2024-2025.

Technical specifications:

thermal power - 12.5 kW;
Efficiency - 87%;
gas consumption - 0.75 m³/h;
nominal gas pressure - 13 mbar, water in the circuit - 2 bar;
maximum temperature - 80 ° C;
dimensions - 59.5x74x36 cm;
weight - 50 kg.

pros

complete silence;
high reliability;
build quality:
Ease of controls;
affordable price.

Minuses

mechanical control system;
no circulation pump.

In its class, the model is recognized as one of the best, because. it combines reliability and price well.

Lemax Patriot-10

The rating of the best single-circuit boilers rightly includes the Lemax Patriot-10 model. it floor-mounted convection-type unit with a closed combustion chamber, capable of heating a room up to 100 m².

Mechanical control, provides power and temperature control.

The heat exchanger is made of stainless steel.

Reliable gas burner equipment and automation system is provided by the Italian company SIT.

A microtorch burner of injector type is installed.

The high efficiency is supported by the innovative design of the turbulators, which delay the exit of hot gases.

A viewing window is provided for monitoring the combustion process, as well as an easily removable top panel for ease of maintenance.

Technical specifications:

thermal power - 10 kW;
Efficiency - 87%;
gas consumption - 0.6 m³/h;
nominal gas pressure - 13 mbar, water in the circuit - 2 bar;
maximum temperature - 80 ° C;
dimensions - 59.5x74x36 cm;
weight - 50 kg.

pros

reliable gas control;
low cost;
Ease of controls;
energy independence.

Minuses

reduced power;
no built-in pump;
no built-in expansion tank.

For small houses, this model is ideal. The manufacturer gives a 3-year warranty.

BAXI ECO-4s 1.24F

Among the best household gas boilers, BAXI ECO-4s 1.24F for indoors stands out area up to 240 m².

It provides convection heating. Closed combustion chamber. Electronic control with the ability to adjust the power in a wide range. The heat exchanger is made of copper.

Efficiency is increased by forced smoke extraction with an exhaust fan.

Wall mounting.

There is a built-in expansion tank with a volume of 6 liters, which makes it possible to connect a water heater.

The modes are shown on the display. There is weather-dependent automation.

The boiler is capable of operating on liquefied gas.

The functionality is extended by connecting a room thermostat and a programmable timer.

Technical specifications:

thermal power - 24 kW;
Efficiency - 93%;
gas consumption - 2.73 m³/h;
nominal gas pressure - 20 mbar, water in the circuit - 3 bar;
maximum temperature - 85 ° C;
dimensions - 40x73x30 cm;
weight - 29 kg.

pros

built-in circulation pump;
the ability to work on natural and liquefied gas;
functions of self-diagnostics, auto-ignition, flame modulation;
water filter;
reliable protection;
copper heat exchanger.

Minuses

dependence on electricity supply;
increased cost.

The model has high reliability and increased power with small dimensions and wall mounting.

Protherm Panther 25 KTO (2015) 25 kW

A subsidiary of the Vaillant Group offers a reliable and safe Protherm boiler Panther 25 KTO (2015) for heating houses and cottages up to 250 m2².

This is a convection type unit with a closed chamber and a copper heat exchanger, wall mounted.

Electronic control provides adjustment of power and temperature of the heat carrier.

Protection against overheating, freezing, blocking of the pump is provided. There is a built-in circulation pump that works without noise.

The necessary information is constantly displayed on the liquid crystal display.

The built-in chimney does not require an additional smoke extraction system.

The heat exchanger provides optimal water circulation, which reduces inertia and increases efficiency.

The kit includes a recirculation device.

Technical specifications:

thermal power - 25 kW;
gas consumption - 2.8 m³/h;
nominal gas pressure -13-20 mbar, water in the circuit - 3 bar;
maximum temperature - 85 ° C;
dimensions - 44x80x34 cm;
weight - 41 kg.

pros

the ability to work on liquefied gas;
built-in expansion tank with a volume of 10 l;
convenient display;
Possibility to connect external control.

Minuses

energy dependence;
significant gas consumption;
increased cost.

The model is fully adapted to Russian conditions, and the price is quite consistent with its class.

The best single-circuit wall-mounted gas boilers

When arranging your own heating in a private house, special attention is paid to boilers that can be mounted on the wall. Thus, it is possible to significantly save the usable area of the room. Below is the TOP-4 of such devices at the beginning of 2024-2025.

Vaillant turboTEC plus VU 282/5-5 28.9 kW

One of the best wall-mounted models is the Vaillant single-circuit boiler. turboTEC plus VU 282/5-5 for space heating up to 290 m2².

It has a closed turbocharged combustion chamber with a modulating burner made of chromium-nickel steel. Control electronic, push-button with a possibility of regulation of temperature of water.

Heat exchanger made of copper. There is a display. Combustion products are discharged forcibly by a fan through a special, certified system.

Additionally, you can install water heaters of various types..

The installed software allows you to control the modes, configure parameters, and carry out self-diagnostics.

Technical specifications:

thermal power - 28.9 kW;
Efficiency - 91%;
gas consumption - 3.2 m³/h;
nominal gas pressure - 13-20 mbar, water in the circuit - 3 bar;
maximum temperature - 85 ° C;
dimensions - 44x80x33.8 cm;
weight - 44 kg.

pros

auto diagnostics;
the ability to connect external control;
modulating burner with adjustable output;
intelligent pressure control system;
embedded software.

Minuses

increased cost;
significant gas consumption.

The boiler is highly reliable and efficient, which fully justifies the increased price.

Lemax Premium-30N 30 kW

A worthy place in the ranking is given to the Lemax Premium-30N model, which can heat area 300 m².

This model is assembled in the Russian Federation, but is equipped with Italian automatics. It is designed for floor installation.

It has an open type combustion chamber with a Polidoro injector microtorch burner.

The boiler is single-circuit, but you can connect a boiler and a room thermostat. The heat exchanger is made of stainless steel according to European and American standard.

The temperature regulator has a scale and is placed on the front panel.

Equipped with Comfort SE turbo nozzle for forced removal of combustion products.

A smooth start is provided through a special system. You can switch to work with liquefied gas.

Technical specifications:

thermal power - 30 kW;
Efficiency - 90%;
gas consumption - 1.75 m³/h;
nominal gas pressure - 13-20 mbar, water in the circuit - 3 bar;
maximum temperature - 90 ° C;
dimensions - 96x47x55.6 cm;
weight - 80 kg.

pros

affordable price;
energy independence;
economical gas consumption;
reliable automation and electronics;
anti-corrosion coating of the heat exchanger.

Minuses

no built-in expansion tank;
lack of "summer" mode.

With a sufficiently high heat output, the boiler has a reasonable price, which is especially noted by consumers.

Lemax Leader-25N 25 kW

Another excellent unit from the Lemax company is the Lemax Leader-25N single-circuit boiler. convection type for heating houses up to 150 m2².

It has an open combustion chamber, and the Viadrus heat exchanger is made of cast iron with an anti-corrosion coating. Mechanical control. Installed automatic Nova.

The boiler is designed for natural gas.

An improved system of protection against overheating, soot formation, flame blowing out, thrust termination has been applied.

A system for the forced removal of combustion products is provided. Maintenance is simplified by the easily removable lining.

Technical specifications:

thermal power - 25 kW;
Efficiency - 90%;
gas consumption - 3 m³/h;
nominal gas pressure - 13 mbar, water in the circuit - 4 bar;
maximum temperature - 95 ° C;
dimensions - 51.5x85.6x51.5 cm;
weight - 115 kg.

pros

energy independence;
real value;
adaptation to Russian conditions;
reliable protection;
Ease of controls.

Minuses

mechanical control;
big weight;
no self-diagnosis.

Among the units of significant performance, the model is distinguished by its simplicity, reliability and affordable price.

BAXI LUNA Platinum+ 1.24 26.1 kW

One of the leaders in the ranking of the best gas boilers is the BAXI LUNA Platinum + 1.24 model for rooms up to 260 m2².

This condensing type boiler has a closed combustion chamber. The heat exchanger is made of stainless steel.

Electronic control. The modes are shown on the display. It displays temperature, pressure, error code, operating parameters, flame status

There is a built-in circulation pump and an expansion tank of 8 liters.

There are programs for weekly work programming, seasonal work settings.

Weather-dependent automation is involved. Installed ntc sensor for safe removal of combustion products. Provided power modulation (1:10).

Technical specifications:

thermal power - 26.1 kW;
gas consumption - 2.6 m³/h;
nominal gas pressure - 5-20 mbar, water in the circuit - 4 bar;
maximum temperature - 90 ° C;
dimensions - 45x76x34.5 cm;
weight - 34.5 kg.

pros

reliable electronic control;
remote control;
auto diagnostics and auto ignition;
possibility of wall installation;
quality water filter.

Minuses

high price.

The model conquers with its reliable electronics, fine adjustment and safety, which compensates for the high cost.

The best single-circuit floor gas boilers

Gas boilers in the floor version have increased power, which makes it possible to heat large houses.Below is the TOP-4 of such single-circuit units.

Lemax Wise 25 25 kW

The Lemax Wise 25 model for space heating up to 250 m is distinguished by high quality². This is a convection type gas boiler with an open combustion chamber.

Management is provided by electronics. The heat exchanger is made of cast iron 4 mm thick and has a volume of 14 liters.

The unit is equipped with an auto-diagnostic system. Protection against overheating, interruption of traction and freezing is provided.

Provides smooth modulation of the flame in continuous mode. You can connect a room thermostat, boiler, external control unit.

The boiler works normally even with a minimum amount of water. The circulation of the coolant can be natural or forced.

Technical specifications:

thermal power - 25 kW;
Efficiency - 90%;
gas consumption - 1.5 m³/h;
nominal gas pressure - 6-25 mbar, water in the circuit - 3 bar;
maximum temperature - 95 ° C;
dimensions - 51.5x86x52 cm;
weight - 116 kg.

pros

works on natural and liquefied gas;
convenient display;
possibility of external control;
economical gas consumption.

Minuses

no built-in expansion tank;
energy dependence;
great weight.

As a floor-standing boiler, this model suits the vast majority of buyers who do not note any shortcomings in their reviews at all.

Lemax Wise 16 16 kW

In the line of gas boilers of the Lemax company, the single-circuit model Lemax Wise stands out 16 for heating houses up to 160 m2².

Its design is largely similar to the previous model.

Reliable control is ensured by Italian automation from SIT, and the microtorch burner is provided by POLIDORO. Viadrus cast iron heat exchanger installed.

Electronic flame modulation available.

Provides control of an external water heater.

The device is able to work stably at low inlet gas pressure and significant voltage drops..

You can switch to LPG.

Technical specifications:

thermal power - 16 kW;
Efficiency - 90%;
gas consumption - 0.96 m³/h;
nominal gas pressure - 6-20 mbar, water in the circuit - 3 bar;
maximum temperature - 90 ° C;
dimensions - 43x86x52 cm;
weight - 96 kg.

pros

high-strength heat exchanger with anti-corrosion coating;
precise adjustment and maintenance of the regime;
the presence of an economy mode "summer";
affordable price.

Minuses

no built-in pump;
energy dependence.

When installing a boiler, the model is able to provide hot water supply.

BAXI SLIM 1.150 i 14.9 kW

The gas single-circuit boiler BAXI SLIM 1.150 i is distinguished by the highest quality for rooms up to 150 m2².

This is a floor-standing unit with an open type combustion chamber and a burner with smooth power control.

It has a built-in expansion tank of 10 liters. The primary heat exchanger is sectional, cast iron. Electronic control. The chimney provides natural draft.

High-speed built-in pump allows you to create a forced circulation of the coolant.

There is a flame control probe using an ionization electrode.

To prevent boiling, the device is automatically turned off (on).

The self-diagnosis system monitors the occurrence of failures.

Technical specifications:

thermal power - 14.9 kW;
Efficiency - 89.5%;
gas consumption - 1.74 m³/h;
nominal gas pressure - 6-20 mbar, water in the circuit - 3 bar;
maximum temperature - 85 ° C;
dimensions - 36x85x52 cm;
weight - 93 kg.

pros

built-in expansion tank;
adjustment in a wide range;
the ability to work on natural and liquefied gas;
can work on the "warm floor" system.

Minuses

energy dependence;
increased gas consumption.

For reliability and safety, the unit receives very flattering reviews.

Protherm Bear 30 PLO 26 kW

A high-quality Slovak floor-standing boiler Protherm appeared on the Russian market Bear 30 PLO for heating residential and industrial premises up to 260 m2².

It has an open combustion chamber. The section heat exchanger is made of cast iron of the Czech production.

You can install a fan for the forced removal of combustion products and an external water heater.

A display is provided that shows the continuous mode of operation..

There is protection of the heat exchanger against condensate. Automatic ignition of the boiler is carried out using piezoelectric elements.

Two-stage power regulation.

Technical specifications:

thermal power - 26 kW;
Efficiency - 90%;
gas consumption - 3 m³/h;
nominal gas pressure - up to 30 mbar, water in the circuit - 3 bar;
maximum temperature - 90 ° C;
dimensions - 42x88x60 cm;
weight - 110 kg.

pros

convenient auto ignition;
reliable gas control and protection system;
durable two-way heat exchanger of 4 sections;
winter-summer mode.

Minuses

energy dependence;
no built-in expansion tank.

Despite the significant cost, the unit is popular, which is ensured by durability and high build quality.

Classification of single-circuit gas boilers

Single-circuit gas boilers are classified according to several criteria.

According to the method of installation, these types are distinguished:

Wall mounted boilers. They are mounted on the wall with special brackets. They are small in size and weight, but their power is limited.
Floor boilers. Are established on the equipped platform on a floor. The main advantage is increased power. They can be heavy, and their installation requires a separate room.

According to the material of the heat exchanger, boilers have such varieties:

Steel. Some grades of stainless steel are used.
Copper. These heat exchangers are characterized by high heat transfer and efficiency. Boilers are high cost equipment.

According to the method of heating the coolant, these types of boilers are distinguished:

Convection. The coolant in the exchanger is heated by a gas burner.
Condensing. The principle of two-stage heating is used.

When choosing a gas boiler, you should carefully consider the pros and cons of different types of devices, taking into account specific operating conditions.

Differences between single-circuit and double-circuit boiler

Gas boilers can have 1 or 2 independent coolant circuits.

The single-circuit version is intended only for heating the house.

The heat carrier is supplied to the boiler, and the heat exchanger is included in the autonomous power supply system.

The double-circuit unit has 2 independent circuits for the circulation of the coolant.

One of them is designed for space heating, and the second one is for water heating, i.e. hot water supply. Such boilers have increased power and dimensions.

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