Currently, double-circuit solid fuel boilers are actively used for heating a private house. Such popularity is due to the simplicity and reliability in operation, efficiency and affordable cost. Briquettes, sawdust, wood chips, coal, firewood can be used as fuel, which is especially important when it is not possible to connect other heating equipment (electric, gas, etc.).
Design features
Unlike single-circuit models, a double-circuit solid fuel boiler heats the coolant not only for the heating system, but also provides hot water. The equipment is equipped with two tanks and a heat exchanger that passes through both tanks. Heating medium forthe heating circuit takes place in one boiler, the water is heated in the second.
In addition to tanks, the following main components can be distinguished in the structure of the boiler:
- Combustion chamber.
- Aeration and combustion zone.
- Telescopic tube.
- Air distributor.
- Shift flap.
- Automatic draft control.
- Air heating chamber.
Some dual-circuit solid fuel heating boilers provide the user with the opportunity to make a supply of fuel. A certain number of briquettes is placed in the chamber, their supply to the furnace will be carried out automatically with a specified time interval. Long-burning equipment is capable of operating in this mode for up to 8 hours.
Water can be used as a heat carrier in the heating circuit. This is the safest, and most importantly, inexpensive option for private households, in which a double-circuit solid fuel boiler will be heated daily.
If a long absence of owners is planned during the cold season, it is advisable to give preference to antifreeze. Since at negative temperatures, the water in the pipelines will freeze, which will provoke an accident.
Benefits
- Relatively low cost of equipment and installation.
- Double-circuit solid fuel boiler can be installed independently.
- Such units are able to work in the absence of power supply.
- Economy in operation due toquite high efficiency.
- Safe, easy and reliable operation.
- Possibility of using various types of solid fuels.
Flaws
- Additional space will be needed to store solid fuels.
- Significant weight and dimensions require a separate room or a specially equipped place with good ventilation.
- Solid fuel double-circuit boilers for the home require regular maintenance (cleaning the chimney, ash pan, combustion chamber, etc.).
- A good draft chimney is required to remove combustion products.
- Irrational use of fuel during the summer period (when only hot water is required).
- It is impossible to maintain and regulate stable heating in the hot water circuit.
- Unable to switch to automatic control mode (unit operation control, manual fuel loading).
Working principle
When fuel is burned in the boiler unit, the coolant is heated for both circuits. In the first, water moves and passes through the heating devices, followed by its return to the boiler. The second circuit is designed to heat domestic water, which passes through the storage tank in the form of a coil for hot water supply.
As a rule, a double-circuit solid fuel boileradditionally connected to a boiler, which will provide the possibility of heating water from the electrical network during those periods when the equipment is not used for heating.
More efficient are double-circuit solid fuel pyrolysis or long-burning units. In the latter case, high efficiency is achieved through bottom combustion, that is, side and bottom air is supplied to the combustion chamber (furnace), which ensures a long-term, smooth and efficient fuel combustion process.
In the most advanced pyrolysis-type equipment, the fuel combustion process is more efficient due to the afterburning of pyrolysis gases (volatile combustion products), as a result, additional heat is generated to heat water.
Selection Tips
When choosing a double-circuit solid fuel boiler (reviews below), it is important to correctly calculate the power, that is, the need for additional heat output to heat domestic water.
To ensure a 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 the summer.
Popular models and consumer reviews
The range of equipment of this type is quite wide, manufacturers offer solid fuel double-circuit boilers for a private house (the price is indicated below) of various capacities, capacities and sizes. The choice depends on many parameters, including the required functionality,area of the house, as well as the allocated budget. You need to analyze all the main characteristics in the aggregate.
Let's 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 can be easily mounted even in a small space. The boiler has good power and does not cause problems during operation. To manage its operation, just read the instructions.
Many additional features make the maintenance and safety of the machine easier. The manufacturer's warranty is 24 months, however, according to consumer reviews, boilers last much longer, but subject to proper installation and timely maintenance.
Key Features:
- Country of origin - Germany.
- Unit power - 7-13.5 kW.
- Equipment weight - 154.9 kg.
- Fuel types - wood, hard and brown coal.
- Chimney size - 145 mm.
- Efficiency - 78%.
- Cost - approximately 35,000 rubles.
Atmos D. C.22S
This is a pyrolysis-type steel equipment that can handle the heating of a large area home. Despite the high power, this boiler is quite compact, which is why 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 fired with ordinary firewood, the volume of the combustion chamber allows you to lay large pieces.
Key Features:
- Producer country - Czech Republic.
- Boiler power - 15-22 kW.
- Thrust - 23 Pa.
- Weight of the unit - 319 kg.
- Efficiency - up to 88%.
- Cost - about 110,000 rubles.
Dakon DOR12
This equipment has the following characteristics:
- Production - Czech Republic.
- Fuel - wood, coal.
- Chimney size - 145 mm.
- Equipment power - 12 kW.
- The weight of the boiler is 158 kg.
- Efficiency - 24%.
- Cost - about 34,000 rubles.
It is important to remember that the development of a dual-circuit heating system project requires a professional approach. Even before the start of construction, it is necessary to complete all thermal engineering calculations that are needed to determine the capacity of the boiler unit.
