Two-circuit solid fuel heating boiler for a private house: description, characteristics and reviews

Currently, two-circuit solid fuel boilers are actively used for heating a private house. Such popularity is due to simplicity and reliability in operation, economy and affordable cost. Briquettes, sawdust, wood chips, coal, firewood can be used as fuel, which is especially important in the absence of the possibility of connecting other heating equipment (electric, gas, etc.).

Design features

Unlike single-circuit models, a two-circuit solid fuel boiler heats the heat carrier not only for the heating system, but also provides hot water supply. The equipment is equipped with two tanks and a heat exchanger, which passes through both tanks. Heating of the heating medium for the heating circuit takes place in one boiler, the water heats up in the second.

In addition to the containers, the following main components can be distinguished in the structure of the boiler:

• The combustion chamber.
• Zone of aeration and combustion.
• Telescopic tube.
• Air distributor.
• Switching flap.
• Automatic traction control.
• Air heating chamber.

Some two - circuit solid fuel heating boilers provide the user with the ability to make fuel reserves. A certain amount of briquettes is placed in the chamber, their supply to the furnace will be carried out automatically with a given time interval. Equipment for long-term combustion can function in this mode up to 8 hours.

You can use water as a coolant in the heating circuit. This is the safest, and most importantly, inexpensive option for private households, in which a two-circuit solid fuel boiler will be heated daily.

If in the cold period of the year there is a long absence of owners, it is desirable to give preference to antifreeze. As with negative temperatures, the water in the pipelines freezes, which will trigger an accident.

Benefits

• Relatively low cost of equipment and its installation.
• A two - circuit solid fuel boiler can be installed independently.
• Such units are able to work in the absence of electricity.
• Economical operation due to a rather high efficiency.
• Safety, simplicity and reliability of operation.
• The possibility of using various types of solid fuel.

disadvantages

• To accommodate the reserves of solid fuel will require additional space.
• Significant weight and overall dimensions require a separate room or a specially equipped place with good ventilation.
• Solid-fuel two-circuit house boilers require regular maintenance (cleaning of the chimney, ash pan, combustion chamber, etc.).
• To remove combustion products a chimney with good draft is necessary.
• Irrational use of fuel in summer (when only hot water is required).
• It is impossible to maintain and regulate a stable heating in the hot water circuit.
• It is impossible to switch to automatic control mode (unit operation control, manual fuel loading).

Principle of operation

When fuel is burned in the boiler unit, the heating medium is heated for both circuits. In the first, the water moves and passes through the heating devices, and then it returns to the boiler. The second circuit is designed for heating domestic water, which passes through a storage tank in the form of a coil for hot water supply.

As a rule, a double-circuit solid fuel boiler is additionally connected to a boiler that will provide the possibility of heating water from the electrical network during periods when the equipment is not being used for heating.

More effective are two-circuit solid fuel assemblies pyrolyzed or long burning. In the latter case, high efficiency is achieved through bottom combustion, that is, the combustion chamber (furnace) produces lateral and lower air supply, thereby ensuring a long time-consuming, smooth and efficient combustion of fuel.

In the most advanced pyrolysis-type equipment, the combustion of fuel occurs more efficiently by the afterburning of pyrolysis gases (volatile combustion products), resulting in the generation of additional heat to heat the water.

Tips for choosing

Choosing a dual-circuit solid fuel boiler (reviewed below), it is important to correctly calculate the power, that is, the need for additional heat output for heating domestic water.

To ensure year-round supply of water for hot water supply, it is necessary to additionally install a boiler equipped with a heating element for heating in summer time.

Popular models and consumer reviews

The range of equipment of this type is quite wide, manufacturers offer solid-fuel dual-circuit boilers for a private house (the price is indicated below) of different capacities, capacities and sizes. The choice depends on a variety of parameters, including the required functionality, the area of the house, as well as a dedicated budget. Analyze all the basic characteristics in the aggregate.

Consider the most popular models of these devices.

Buderus, Logano S110-2

This steel equipment is designed for floor installation. It is quite compact, and it can easily be mounted even in a small room. The boiler has good power and does not cause problems during operation. To manage its work, it is enough to read the instruction.

Numerous additional functions simplify the maintenance process and the degree of safety of the unit. The manufacturer's warranty is 24 months, however, according to consumers' reviews, the boilers serve much longer, but with the proper installation and timely maintenance.

Main characteristics:

• The country of origin is Germany.
• The power of the unit is 7-13.5 kW.
• The weight of the equipment is 154.9 kg.
• Types of fuel - wood, stone and brown coal.
• The chimney is 145 mm in size.
• Efficiency - 78%.
• The cost is approximately 35 000 rubles.

Atmos DC22S

This is a pyrolysis-type steel equipment that can cope with the heating of a large area house. Despite the high power, this boiler is quite compact, it is for this reason that consumers choose it most often. Models from other manufacturers with similar characteristics take up much more space. The unit is designed for wall mounting, which makes the operation more convenient. It can be heated with conventional firewood, the volume of the combustion chamber allows you to lay pieces of large size.

Main characteristics:

• Country of origin - Czech Republic.
• The power of the boiler is 15-22 kW.
• Thrust - 23 Pa.
• The weight of the unit is 319 kg.
• Efficiency - up to 88%.
• The cost is about 110,000 rubles.

Dakon DOR12

This equipment is characterized by the following characteristics:

• Production - Czech Republic.
• Fuel - wood, coal.
• The chimney is 145 mm in size.
• Capacity of the equipment is 12 kW.
• The weight of the boiler is 158 kg.
• Efficiency - 24%.
• The cost is about 34 000 rubles.

It is important to remember that a professional approach is required to develop a two-circuit heating system project. Even before the start of construction it is necessary to perform all the heat engineering calculations that are needed to determine the power of the boiler unit.