How to choose the most reliable and economical device: rating of wall-mounted gas boilers with characteristics

Gas boiler - the main device in the central heating system.

It is used to burn natural gas and transfer its energy via a heat carrier into the premises to maintain the required temperature.

Study carefully device specifications before buying. It is important to understand the principle of its operation, because it is the main element of the heating system: the comfort in the house depends on its quality and operating parameters.

Main technical characteristics of wall-mounted gas heating boilers

The main characteristics include power, number of circuits, performance and other important criteria.

Execution

• 

  Floor standing. They have large dimensions and power. As a rule, they are more reliable, since the design uses strong, durable materials.

However, it is not always possible to place such a boiler in a house - A separate boiler room is needed.

• Wall mounted, considered in the review. Compact models that do not require a separate room, the heating power is limited 30 kW. They have been released relatively recently, so they have the most modern technologies, which makes them effective and easy to use.

If there are a lot of impurities, due to high temperatures they can quickly destroy the heat exchanger and lead to the failure of the boiler.

Number of contours

Some gas wall-mounted units provide not only heating for the building, but also hot water supply (DHW), combining these functions in one device.

Such devices were called double-circuit, because they have a circuit in which the coolant for the central heating system circulates and a second circuit in which water flows for hot water supply.

When a hot water tap is opened at a point of water intake (for example, in a bathroom), an electronic sensor registers this and, using a three-way valve, transfers all the thermal energy of the gas to the flow-through heating of water for DHW. When the tap is closed, the boiler again operates for heating.

Gas boilers that are designed only for heating a house are called single-circuit.

Power

The main parameter that is paid attention to. The required power depends on the area and insulation heated premises, climate.

For dual-circuit systems, the required power is estimated 30% more necessary for heating.

In any case, the device is selected with a small margin.

However, it is also unwise to buy a boiler that is too powerful for a small building: when operating at low power, gas boilers show low efficiency, which leads to additional costs.

Combustion chamber type

• Open. Open combustion chamber boilers operate using the natural draft of oxygen coming from the gas combustion room.

An open chamber also imposes restrictions on the chimney: it must be strictly vertical. Floor models are most often equipped with such a chamber, but there are also wall-mounted versions.

• 

  Closed. The combustion process in these devices is completely isolated from the room and occurs, in fact, outside. Air for the gas mixture is taken from outside the house, combustion products are also removed outside.

This is achieved with the help of forced-draft fans, which is why such boilers are also called turbocharged.

The chimney can be made either in the form of separate pipes or a coaxial one - a "pipe in pipe" design, when combustion products are removed through the inner pipe, and air enters the boiler through the outer one. Due to the heating of cold air from the street by combustion products, the efficiency increases, and fans allow you to build chimney of any configuration, even with horizontal sections.

Despite the obvious advantages of a closed chamber, it has a disadvantage: energy dependence, because turbocharger fans require electrical power.

Temperatures of coolant and hot water supply

Maximum temperature at the outlet of a gas boiler (in a heating or hot water supply system) depends on the design of the gas burner and electronics boiler. If the coolant temperature is usually more than sufficient, then some low-power boilers unable to heat water for domestic needs of acceptable values. Pay attention to this.

DHW performance and temperature difference Δt

Standard household faucet with ½” connection has a productivity of the order of 400 l per hour or about 6.6 l/min, and if there is more than one water intake point in the house, all of them must be taken into account.

The characteristics indicate the maximum performance that a double-circuit boiler unit can provide at a given Δt, where Δt — the difference between the temperatures of cold water entering the boiler and hot water leaving the boiler.

Efficiency

It is defined as the ratio of useful power transferred to heating and water heating to the power released during gas combustion. Indirectly affects gas consumption: The higher the efficiency, the more efficiently the boiler operates. Almost all modern models have Efficiency > 93%, the difference here is insignificant, so this is one of the last parameters to pay attention to.

TOP 10: rating of the best and most popular attachments

In the rating TOP 10 The best wall-mounted gas boilers include a number of models from popular manufacturers.

Buderus Logamax Plus GB162-65

Despite the very high power and efficiency, its price is excessively high. In addition, the heavy weight leads to installation problems.

• Power: 14.6–60 kW.
• Number of contours: 1.
• Combustion chamber: closed.
• Efficiency: 97.8%.
• Coolant temperature: 30–90°С.
• Weight: 70 kg.
• Price: 220 thousand rubles.

Protherm Gepard 23 MOV

The only representative of the review with an open combustion chamber, therefore it requires a ventilation device in the room - definitely can't be considered a plus this model.

• Power: 9–23 kW.
• Number of contours: 2.
• Combustion chamber: open.
• Efficiency: 90.3%.
• Coolant temperature: 38–85°С.
• DHW temperature: 38–60 °C.
• DHW performance: 11.1 l/min @ Δt=30°С.
• Weight: 31 kg.
• Price: 32 thousand rubles.

Photo 1. Gas boiler model Protherm Gepard 23 MOV, equipped with an open combustion chamber.

Baxi LUNA-3 COMFORT 240 Fi

Many have a boiler does not maintain the DHW temperature well, does not reach the required level or jumps, everything is fine with the heating. If DHW is not the most important thing for you - a good option.

• Power: 9.3–25 kW.
• Number of contours: 2.
• Combustion chamber: closed.
• Efficiency: 92.9%.
• Coolant temperature: 30–85°С.
• DHW temperature: 35–65°С.
• DHW performance: 10.2 l/min @ Δt=35°С.
• Weight: 38 kg.
• Price: 47 thousand rubles.

Photo 2. Gas boiler Baxi LUNA-3 COMFORT 240 Fi, with high power and closed combustion chamber.

Vaillant ecoTEC plus VUW INT IV 246/5-5

Well equipped, reliable, power is regulated in very wide ranges. Made in Germany. Due to the condensation of gas vapors, Efficiency can reach 104.5%However, the unreasonably high price does not allow it to take high positions in the review.

• Power: 3.8–20 kW.
• Number of contours: 2.
• Combustion chamber: closed.
• Efficiency: 98.1%.
• Coolant temperature: 30–85°С.
• DHW temperature: 35–65°С.
• DHW performance: 11.5 l/min @ Δt=30°С.
• Weight: 35 kg.
• Price: 81 thousand rubles.

Photo 3. Gas boiler Vaillant ecoTEC plus VUW INT IV 246/5-5, is distinguished by its power and reliability.

Beretta City 24 RSI

High power, adjustable in a wide range. Users note good warranty service in Russia. Boiler single-circuit, but at this price it may be the best option.

• Power: 7.6–25 kW.
• Number of contours: 1.
• Combustion chamber: closed.
• Efficiency: 92.8%.
• Coolant temperature: 40–80°С.
• Weight: 31 kg.
• Price: 37 thousand rubles.

A boiler of German quality, with the highest coolant temperature in the rating (90°С). And also excellent performance for hot water supply, the ratio price/functionality.

• Power: 9.4–24 kW.
• Number of contours: 2.
• Combustion chamber: closed.
• Efficiency: 90%.
• Coolant temperature: 40–90°С.
• DHW temperature: 40–60°С.
• DHW performance: 11.5 l/min @ Δt=30°С.
• Weight: 40 kg.
• Price: 49 thousand RUR

Ariston BS II 24 FF

Users note that the boiler of the Italian manufacturer is economical and reliable. In addition has a low price, therefore it can be an excellent entry-level solution for heating and water supply.

• Power: 10–24 kW.
• Number of contours: 2.
• Combustion chamber: closed.
• Efficiency: 93.8%.
• Coolant temperature: 35–85°С.
• DHW temperature: 36–65°С.
• DHW performance: 9.7 l/min @ Δt=35°С.
• Weight: 30 kg.
• Price: 23 thousand rubles.

Photo 4. Gas boiler Ariston BS II 24 FF with two circuits, equipped with a closed combustion chamber.

Bosch Gaz 6000 W WBN 6000-24 C

A Russian-made boiler, specially adapted by Bosch for our conditions: works at any voltage (165-230 V) and gas pressure drops (10.5–16 bar). Works on both liquefied and natural gas.

• Combustion chamber: closed.
• Power: 7.2–24 kW.
• Efficiency: 90%.
• DHW temperature: 35–60°C.
• Heating temperature: 40–82°C.
• DHW performance: 6.8 l/min @ Δt=50°С.
• Weight: 32 kg.
• Price: 29 thousand rubles.

Photo 5. Gas boiler Bosch Gaz 6000 W WBN 6000-24 C, can operate with voltage drops.

Navien DELUXE 24K

Durable. Convenient and ergonomic control. The unit is of Korean manufacture - well suited for use in Russia, has a moderate price.

• Power: 9–24 kW.
• Number of contours: 2.
• Efficiency: 90.5%.
• Combustion chamber: closed.
• DHW temperature: 30–60°C.
• Heating temperature: 40–80°C.
• DHW performance: 13.8 l/min @ Δt=25°С.
• Weight: 28 kg.
• Price: 27500 RUR

Photo 6. Gas boiler Navien DELUXE 24K with two circuits, closed combustion chamber.

Baxi Duo-tec Compact 24

It works on the condensation principle, due to this Efficiency increases to 105%. It has balanced parameters, good functionality and a low price for a condensing boiler, which is why it is the leader of our rating.

• Power: 3.4–20 kW.
• Number of contours: 2.
• Combustion chamber: closed.
• Efficiency: 97%.
• Coolant temperature: 25–80°С.
• DHW temperature: 35–60°С.
• DHW performance: 9.8 l/min @ Δt=35°С.
• Weight: 34 kg.
• Price: 47 thousand rubles.

Photo 7. Gas boiler Baxi Duo-tec Compact 24 with two circuits, operating on the condensing principle.

Useful video

A video review that talks about seven models of popular, high-quality wall-mounted gas boilers.

Which one is better for home in terms of reliability and quality?

The winner of our rating is Baxi Duo-tec Compact 24. Judging by user reviews, it really is the most reliable and economical device. For an average price in 47 thousand rubles It offers rich functionality that will suit most typical users.

If there is no possibility to spend such money on heating, it is better Please pay attention to Ariston BS II 24 FF. This is a budget model, however, despite its limited functionality, it is also noted for its high reliability, quality and durability.