Which gas boiler is the most economical and reliable?

The best wall-mounted gas boilers

Wall-mounted boilers are used mainly in apartment buildings. Their design is quite compact, which allows you to save the already limited free space of the apartment.

The best wall-mounted gas boiler - Bosch Gaz 6000 WBN-24CRN

Bosch is a new player in the heating boiler market, which has already gained popularity due to the highest quality of its products. The most popular double-circuit boiler from the German company is the Bosch GAZ 600 WBN model, which is the most purchased wall-mounted boiler in Europe.

Let's look at the advantages of the Bosch GAZ 600 WBN:

• High level of efficiency – 93.2%;
• Economical gas consumption – 2.7 cubic meters at maximum power;
• The presence of a turbocharged gas combustion chamber;
• A complex of electronic systems for protection against overheating, pressure reduction and self-extinguishing.

The disadvantages of the model include the need to connect to the power grid, however, in apartments, problems with sudden power outages, as a rule, arise very rarely. In general, in terms of all its characteristics, the Bosch GAZ 600 WBN is an ideal gas boiler for heating an apartment.

The most economical gas boiler for the home - Protherm Panther 12 KTZ

Protherm Panther 12 KTZ is an ideal option for heating rooms up to 86 sq.m. It is perfect for both home and apartment. The boiler power is 11.5 kW, which is sufficient to maintain a high temperature in the home even in the coldest season.

Protherm Panther 12 KTZ has the following advantages:

• Extremely economical gas consumption - 1.3 m3 per hour, which is achieved thanks to a turbocharged combustion chamber;
• Compact dimensions - 90*41*57 cm;
• Possibility of equipping the device with special jets for operation on liquefied gas;
• Possibility of operating the boiler in low temperature mode up to 45 °C.

The owners of the Protherm Panther 12 KTZ assure that this model is extremely reliable - there are no reviews of its breakdowns or manufacturing defects.

The best double-circuit gas boilers

For a number of reasons, double-circuit boilers may be preferable. For example, they do not require a boiler to supply hot water, and due to the absence of additional equipment, they not only save space, but also reduce the load on the electrical network. And the cost of some dual-circuit models is comparable to their single-circuit counterparts. However, they cannot provide a supply of warm water, heating only the amount that is needed at the current moment. With dual-circuit devices it is not possible to install a circulation pump. Because of this, hot water can reach the tapping point only after some time. Otherwise, these are excellent solutions for both a private house and an apartment.

Lemax PRIME-V32 32 kW dual-circuit

It is difficult for an inexperienced buyer to choose a good gas boiler with two circuits without spending extra money on it. Manufacturers offer dozens of excellent solutions, but many of them either do not meet user needs or are beyond the budget. Fortunately, there is one truly excellent device on the market that is receiving numerous positive reviews - PRIME-V32 from the Lemax brand.

Today, the manufacturer offers 10 devices in the PRIME-V line. The 32-kilowatt model is the most powerful in the company’s range. All units in this series support the control function from mobile devices running Android and iOS. The technique can also be used with additional equipment.

Advantages:

• attractive price;
• performance;
• high degree of efficiency;
• European components;
• low noise level;
• presence of LCD display;
• reed flow sensor.

Bosch Gaz 6000 W WBN 6000-35 C 37.4 kW dual-circuit

Let's move on to the most powerful boiler in the rating. Despite the similar name, this model differs from the previously described device from the six thousand line not only in power. The expansion tank in this boiler has become 2 liters larger, and hot water productivity has increased to 9.6 and 15 l/min at temperatures of 50 and 30 degrees, respectively. The consumption of natural and liquefied gas also increased to 3.9 m3 and 2.7 kg per hour. The dimensions have not changed much (the device has become 16 mm wider), but 7 kg have been added to the weight of the boiler.

Advantages:

• impressive power;
• balanced cost;
• high build quality;
• heat exchanger made of high-strength copper;
• quick installation;
• convenient control.

Flaws:

difficult initial setup.

BAXI LUNA-3 310 Fi 31 kW dual circuit

The TOP of boilers is completed by a modern double-circuit solution for wall installation. The LUNA-3 310 Fi model is adapted for domestic water and gas supply systems. The device remains operational when the inlet pressure drops to 5 mbar. On the boiler body there is a control panel with a display. It is removable, so the user can place it in any convenient place. As an additional option, the manufacturer offers a wireless panel with a temperature sensor. After reconfiguration, the 2-in-1 boiler from BAXI can operate on liquefied gas (permissible pressure 37 mbar). This makes the 310 Fi a good choice for a summer house or cottage.

Advantages:

• liquid crystal display;
• electronic self-diagnosis system;
• ionization gas control function;
• reliable electronics;
• pump blocking protection system;
• great functionality;
• possibility of connecting a thermostat.

Flaws:

not the easiest installation.

What affects the efficiency of a boiler?

In order to learn how to correctly choose the most economical gas boilers for specific conditions, you will first need to understand how thermal energy is produced and distributed during gas combustion.

The calorific value of the gas used for heating must comply with regulatory requirements. Of course, it is not consumers who are responsible for this, but gas supply organizations, but only high-quality fuel can help a gas heating boiler achieve its design efficiency.

An important economic role in the individual heating system is played by:

• type of boiler;
• installed installation materials;
• environmental conditions and geometry of the heating object.

The calorific value of a fuel is an indicator that determines the amount of heat released when a unit volume of gas is burned. The efficiency of the device shows the portion of the useful heat of combustion used in different heating and hot water modes.

Efficiency and economy are interdependent values ​​- the more complete the use of gas, the lower the specific consumption for generating a unit of heat and, therefore, the less money spent on its purchase, and the heater will be economical.

An economical heating boiler must first completely and efficiently burn natural or liquefied gas, and effectively use the released energy to increase the temperature in the heating system.

In real conditions, combustion and heat transfer processes do not proceed so well:

1. To completely burn the fuel and obtain maximum power, you will need to mix the gas-air mixture in a ratio of 1 to 10, but not all heat generators can do this.
2. The oxidation reaction of methane occurs with the release of CO2 and water, the latter instantly evaporates, thereby taking away part of the heat generated during fuel combustion.
3. The heated combustion products are not able to transfer all their temperature to the coolant, since part of it is carried away by the exhaust gases into the chimney; the size of such losses depends on the design of the device and the gas-air path.

Thus, one part of the gas energy is irretrievably lost during combustion, and the second - during thermal convection. The smaller the total amount of such losses, the more economical the device for homestead housing construction.

The main parameters influencing the efficiency of boiler equipment are the type and design of the boiler unit. They can be volatile or autonomous. The former have a closed combustion chamber and forced air supply from an external powered fan.

Many types of wall-mounted devices belong to this class. The second type is an open-type floor-standing gas boiler that operates on natural ventilation of air and flue gases in the gas-air duct of the unit.

It is much more economical than the previous one, although it has a more complex design with large dimensions, so it is usually designed as a floor-mounted one.

The next parameter is the material of the boiler heat exchangers: copper, cast iron or stainless steel. Copper and cast iron have the highest heat transfer; they are more economical because they significantly reduce fuel consumption.

Another important parameter is related to the technology of the heating process. For example, in condensing boilers, in addition to water coolant, steam is additionally produced.

Despite the increased market price, they consume less fuel to produce a unit of thermal energy and, therefore, have a short payback period.

Particular attention in the energy efficiency package of a boiler heating system must be paid to compliance with the operating rules of gas boilers; users need to know how to set up the efficient operation of the entire heating complex

Therefore, the concept of an economical operating mode is much broader than simply purchasing an efficient unit; it is important that it also corresponds to the heating characteristics of the house and is suitable for the existing heating system

Therefore, the concept of an economical operating mode is much broader than simply purchasing an efficient unit; it is important that it also corresponds to the heating characteristics of the house and is suitable for the existing heating system