The best single-circuit condensing boilers

With a useful power of 26.5 kW and the ability to heat the coolant up to 75 °C, the single-circuit condensing boiler Protherm Lynx Condens 25 MKO can heat residential and office premises with an area of up to 212 m². The design of the device provides the ability to connect to a coaxial or separate chimney. Inside the housing there is a two-stage pump that circulates water through the heating system and an 8-liter expansion tank. The cast heat exchanger is made of silumin. This design is not ideal in terms of efficiency (the declared efficiency of this boiler is 104% - a couple of percent less than that of other manufacturers of similar equipment). But it ensures high reliability of the heat exchanger, makes the boiler more durable, easier to operate and less demanding on maintenance.

There is a display on the front wall of the case. It displays the most important parameters of the device’s operation, as well as errors if they are suddenly detected by the built-in diagnostic system. The equipment is equipped with several protection systems (which control the flame, gas pressure, the presence of draft and water circulation in the circuit), so even users who are completely inexperienced in technology will not have problems. Thanks to the eBus, this boiler can be equipped with additional automation (it is recommended to use inexpensive proprietary Protherm regulators) and integrated into complex heating systems.

Protherm is a Czech company with a plant in Slovakia. It is a “budget” division of Vaillant, one of the world leaders in the production of heating equipment. Boilers of this brand are famous for the fact that they are less “capricious” than equipment from “promoted” brands, and are more consistent with the realities of Eastern European cities. Therefore, purchasing a Protherm Lynx Condens 25 MKO is the right decision if you need a reliable boiler that is unpretentious to the quality of water and gas.

The Hotpoint-Ariston Clas One System 24 RDC condensing boiler is designed for wall mounting indoors. It can heat an apartment, house or office with a total area of up to 195 m². The device is not only economical (typical of all boilers of this type), but also flexible in settings. The modulating burner (with a smooth change in power) instantly responds to temperature changes, precisely adapting to current needs. The coolant temperature can be changed in the range from 35 °C to 82 °C. Control is carried out using standard controls located on the front panel, or a remote module (if the boiler is integrated into the “smart home” system).

Hotpoint-Ariston heating boilers are considered reliable equipment. This model, for example, has a 10-year warranty on the heat exchanger (because it is made of high-quality stainless steel). The durability of the fan and two-speed circulation pump is ensured by automation, which is configured in such a way as to reduce the number of on-off cycles of the boiler.

Hotpoint-Ariston pays a lot of attention to the appearance of household appliances. This device is no exception. It looks more stylish than other boilers (which, as a rule, have a very utilitarian appearance). Therefore, Hotpoint-Ariston Clas One System 24 RDC will easily fit into a kitchen renovated in a modern style. It is also useful to know that you can easily buy any accessories for this model: from indoor and outdoor temperature sensors to kits for converting a condensing boiler to propane.

With a useful power of 20 kW, the Italtherm CITY CLASS 25 KR condensing boiler can be used to heat apartments or private houses with an area of up to 160 m². It is equipped with an Intelligent Combustion System - “smart” electronics that controls many parameters of the equipment and adapts “on the fly” to any changes. Therefore, the boiler reacts responsively to fluctuations in the water temperature in the circuit and instantly adjusts to maintain it at a given level. The same ICS system gives commands to the gas valve and water pump. The electronics control them in such a way as to always have an optimal ratio of the amount of air and gas in the burner, corresponding to the flow of water along the circuit. Due to continuous monitoring and precise control, economical fuel consumption is ensured - in maximum power mode, gas consumption does not exceed 2.64 m³/h. Also noteworthy is the wide range of temperature settings. Using the buttons on the dashboard, the user can set the water temperature in the circuit from 20 °C (therefore this boiler can be used in heating systems such as “warm floors”) to 80 °C (for heating with radiators).

Of particular interest is the “filling” of the boiler - that is, the parts and components from which it is assembled. “Under the hood” there is a high-quality Grundfos circulation pump, a brass hydraulic group, as well as a burner and heat exchanger made of stainless steel(this material is considered the most suitable for boilers of this type due to the high corrosiveness of condensate). The manufacturer emphasizes that the heat exchanger tubes have a larger cross-section (compared to heating equipment manufactured by other companies), which improves heat transfer and prevents plaque accumulation and blockages. The complex of listed technical solutions ensures high reliability of all components and assemblies and simplifies maintenance even when operating the boiler in regions with hard water. Therefore, Italtherm CITY CLASS 25 KR is considered a good choice not only for new buildings, but also for old housing stock with battered water supply pipelines.

WOLF FGB-28 is an efficient gas boiler designed to heat water circulating through the heating circuit of a house. Thermal power of 27.3 kW allows this unit to be used for heating homes and offices with an area of up to 218 m². Thanks to the carefully thought-out design of the chamber, which ensures the most complete combustion of gas fuel, and the condensing principle of operation, the WOLF FGB-28 boiler is considered one of the most economical in its power class. When operating at full load, it consumes only 2.63 cubic meters of gas per hour.

In addition to being economical, this boiler is characterized by high reliability of components and assemblies, ensuring uninterrupted operation of the heating system. It has copper piping and a cast aluminium alloy heat exchanger, and the hydraulic block is made of composite materials. Built-in safety systems protect equipment from almost all possible troubles, including extinguished flames, lack of draft, loss of gas pressure, freezing, etc.

In addition to private houses, Wolf condensing boilers can be installed in multi-apartment buildings with shared chimneys. The manufacturer also guarantees their full compatibility with solar collectors and heat pumps. The boiler can be automated by installing an external temperature sensor (purchased separately). There is also the possibility of remote control of the heating system via a smartphone(there is a special accessory on sale that easily connects to the boiler).

The “Made in Germany” stickers that appear on all Wolf boilers are not empty advertising. The equipment of this brand is produced the old fashioned way in the heart of Europe by the hands of German workers. This is one of the reasons why Wolf equipment is noticeably more expensive than similar devices of the same power class produced by other manufacturers. But the quality of these boilers is appropriate - German, inspiring trust.

The Buderus Logamax Plus GB172i-24 condensing boiler, with a power of 24 kW, can provide heating for a spacious apartment, office or private house with an area of about 190 m². It has a closed chamber(with forced removal of combustion products), so it can be installed in residential areas with poor ventilation. However, it should be taken into account that to connect the boiler you need a coaxial chimney (which is laid through the outer wall) and access to the sewerage system (for condensate drainage), so the kitchen is considered the optimal place for installing such equipment. Thanks to a wide range of burner modulation and an intelligent control system, this device has a wide range of water temperature settings in the heating circuit (from 30 ° C to 82 ° C) and low energy consumption (in full power mode, gas consumption does not exceed 2.59 m³/h). To effectively “extract” heat from flue gases, the boiler is equipped with a reliable and durable spiral heat exchanger made of aluminium alloy, resistant to condensation.

Among other heating boilers, many of which look dull, ordinary and nondescript, Buderus Logamax Plus GB172i-24 stands out for its appearance. The fact is that its front panel is covered with titanium glass (please note that there are options with black or white glass on sale, and do not forget to check this issue in the online store before purchasing). This glass looks beautiful, is easy to clean, does not scratch, and is quite resistant to impacts (there is no risk of accidentally damaging the coating when you open the front cover to access the control panel or the “insides” of the equipment). Thanks to the glass panel, the boiler does not have to be hidden in a cabinet - it will fit perfectly into the interior of a modern kitchen.

It should be noted that this device pleases not only with its aesthetics, but also with its manufacturability. The manufacturer has provided the ability to connect the boiler to systems with solar collectors and heat pumps, as well as the possibility of automation and remote control. True, for all of the above you need to buy additional accessories and controllers - that is, add on top of the already considerable price of the equipment a tidy sum for branded automation.