The best gas boilers with a boiler

Immergas Avio 24-2 ErP is a classic double-circuit boiler with natural draft. It can be installed in an apartment, house or office where it is possible to connect to the chimney. Inside the device there is an indirect heating boiler with a tank for 45 liters of water. This volume is considered small. But this disadvantage is compensated by good productivity (Δt ~30 °C), amounting to 13.5 l/min. Therefore, there should be enough hot water for a family of 2–3 people or a small office team.

This boiler is not the “pinnacle of technology,” but it cannot be called primitive either. Right out of the box, the device has factory settings that ensure fairly economical operation (gas consumption of 2.77 m³/h in maximum power mode is a normal indicator for equipment of this class). With the help of automation(which is purchased separately), the boiler can itself respond to warming and cooling, adapting to the weather outside the window. The durability of the equipment is ensured by “smart” electronics. It analyzes the temperature of the gases leaving the furnace and controls the burner to optimize the combustion process. The water tank is made of stainless steel, which has a very positive effect on the service life of the equipment.

Separately, it should be noted the compact dimensions of the boiler (900x580x380 mm). In terms of height and width, it almost does not stand out among its competitors, but its depth is 8–10 cm less than average. This parameter can be very important if you cannot find a boiler that fits well into the space allocated for it among the kitchen cabinets.

Immergas is the largest manufacturer of domestic heating equipment in Italy. 400–500 thousand boilers of this brand are produced annually. They have a reputation for high-quality and reliable devices with a good price-performance ratio. They are quite easy to maintain and operate. Therefore, the Immergas Avio 24-2 ErP is worth paying attention to if you are looking for a good gas boiler for heating and hot water supply not for all the money in the world.

The Buderus Logamax plus GB172-24 T50 boiler is equipment for wall mounting. It is turbocharged (with a closed combustion chamber), so the air intake is carried out not from the room, but from the outside. This boiler is a condensing boiler. Therefore, it has a high efficiency (109%) and a corresponding energy efficiency class - “A” ratings for both parameters (water heating and space heating).

The boiler volume is small (48 liters). But this does not affect user comfort too much, because this boiler has good performance (up to 14 liters of hot water per minute). The burner power can vary from 27% to 100%, so the device operates confidently over the entire operating power range (from 7.3 kW to a maximum of 24 kW), adapting to the current load. It can also be used in underfloor heating systems. The heat exchanger is designed specifically for “hard” water with a high salt content. Therefore, this boiler can be safely used in Eastern European countries, where the quality of water treatment at water utilities is traditionally low.

Buderus heating equipment does not need any special introduction, because it is one of the most famous brands. Although Buderus boilers are usually 20 - 30 percent more expensive than devices of the same characteristics from other manufacturers, they have many advantages. These include: an excellent brand reputation, a wide service network in our country, availability of spare parts and a large selection of automation. Therefore, if you are looking for an economical double-circuit gas boiler for a house or apartment with an area of up to 192 m2, then Buderus Logamax plus GB172-24 T50 is a good choice.

The heating boiler Italtherm TIME MAX 27 K is a double-circuit boiler. That is, it can simultaneously service heating and hot water circuits. This boiler has a good speed of heating hot water (capacity 16 l/min), so 2 - 3 people will not experience a shortage of it when using it at the same time. And what kind of shortage of hot water can we talk about if the boiler is equipped with a built-in boiler? It has a volume of 60 liters and is constantly heated in parallel with the operation of other circuits. Thus, users always have access to a large volume of water, heated to a temperature of 60 ° C, so that they can shower or fill the bath.

Since Italtherm TIME MAX 27 K is a condensing boiler, it consumes less gas fuel compared to equipment of the same power with a traditional design. When operating at full capacity (at a maximum power of 25.1 kW), the boiler consumes no more than 2.75 m³ per hour of operation (this is considered a good indicator for heating equipment of this class). Italtherm's responsible approach to reliability is also noteworthy. To guarantee a long service life of the boiler, the manufacturer did not skimp and equipped it with a stainless steel heat exchanger (this material is considered the most suitable for condensing units due to the fact that it resists the corrosive action of condensate better than others). The storage boiler is also made of stainless steel. And all components of the hydraulic group are cast from brass.

Considering all of the above, we can safely recommend the Italtherm TIME MAX 27 K boiler for installation in private houses and apartments with an area of about 200 square meters. Moreover, this device has a closed (turbocharged) combustion chamber, so it can be installed in rooms that do not have an exhaust chimney.

The Bosch Condens GC5300i WM 24/100S double-circuit gas boiler, due to its characteristics, is excellent for organizing heating and hot water supply in a private house with an area of about 190 m², inhabited by a family of 3 to 4 people. Thanks to the closed (turbocharged) combustion chamber, it does not require connection to an exhaust chimney - this gives more freedom when choosing where to install the equipment (however, it is worth considering that due to the large weight of 115 kg, only floor installation of the boiler is allowed).

This boiler has a condensing principle of operation. Therefore, it is characterized by high efficiency and economical gas consumption. Savings are also facilitated by a modulating burner, which automatically adjusts its heat output in the range from 10% to 100%, depending on current heat needs. The wide modulation range of the burner allows you to flexibly and accurately adjust the temperature of the liquid in the heating circuits (from 30 °C to 82 °C) and water supply (from 40 °C to 60 °C). The high productivity of the boiler (up to 22.9 l/min) and the presence of the “hot start” function(when the tap is opened, hot water comes out immediately, without delay) deserve special praise. In addition, the boiler stores a substantial supply of heated water in a built-in storage boiler that holds 100 liters of liquid.

It is interesting to note that the Bosch Condens GC5300i WM 24/100S boiler lends itself perfectly to automation, as well as integration into smart home systems (but this will require additional investment in automation or thermostats). It is even possible to control the heating via an application on a smartphone (using the Bosch EasyControl CT 200 controller) or a web browser (when connecting the boiler via the MB LAN2 communication module). This opens up wide opportunities for those who want not only to reduce heating and hot water costs, but also to ensure maximum comfort.

The Vaillant ecoCOMPACT VSC INT 266/4-5 gas boiler has a very large built-in boiler - as much as 150 liters. It is capable of simultaneously servicing the heating circuit (in a house with an area of up to 200 m2) and heating water for several water points. Therefore, it is appropriate to place it in a house where a large family lives (up to 5 - 6 people). The boiler is large (the size of a refrigerator) and heavy (128 kg in a “dry” state), so it is intended exclusively for floor installation.

This boiler is a condensing boiler (not only gas energy is used to heat water, but also the heat of condensation of combustion products). Therefore, it has a very high efficiency (108% according to the methodology adopted among heating equipment manufacturers). Thus, during its life cycle the device will “consume” significantly less gas than traditional type boilers. Economical operation is also facilitated by technologies such as a modulating burner (the device can change the output power in the range from 5.2 kW to a maximum of 25 kW), high-quality insulation of the tank (thermal insulation thickness 6 cm), layer-by-layer heating of water and optimization of the process of mixing gas and air. The design widely uses techniques to ensure the durability of the equipment (for example, a stainless steel burner). The boiler lends itself perfectly to automation and is “built into” a “smart home” using sensors and regulators, which Vaillant produces for every taste and color.

But what definitely won’t please those who want to buy a good double-circuit boiler is the price of the Vaillant ecoCOMPACT VSC INT 266/4-5, because this boiler costs one and a half to two times more than equipment of the same power class with similar characteristics. This cost is partly explained by the “advanced” design of the boiler (the condensing principle of operation mentioned above), as well as the “eliteness” of the brand(after all, Vaillant boilers are considered one of the best). However, despite the high price, the manufacturer has already sold more than 3 million boilers of this model worldwide.