At present, double-circuit solid fuel boilers for heating a private house are actively used. 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 in the absence of the possibility of connecting other heating equipment (electric, gas, etc.).
Design Features
Unlike single-circuit models, a dual-circuit solid fuel boiler heats the coolant not only for the heating system, but also provides hot water supply. The equipment is equipped with two tanks and a heat exchanger that passes through both tanks. The heat carrier for the heating circuit is heated in one boiler, the water is heated in the second.
In addition to tanks, the following main components can be distinguished in the boiler structure:
- The combustion chamber.
- Aeration and combustion zone.
- Telescopic tube.
- Air distributor
- Switch damper.
- Automatic traction control.
- Heated air chamber.
Some dual - circuit solid fuel heating boilers provide the user with the ability 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 predetermined time interval. Long burning equipment is able to function 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 dual-circuit solid fuel boiler will be heated daily.
If a prolonged absence of hosts is planned in 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
- The relatively low cost of equipment and its installation.
- A dual - circuit solid fuel boiler can be installed independently.
- Such units are able to work in the absence of power supply.
- Profitability in work thanks to rather high efficiency.
- Safety, simplicity and reliability of operation.
- The possibility of using various types of solid fuels.
disadvantages
- The storage of solid fuel stocks will require additional space.
- Significant weight and overall dimensions require a separate room or a specially equipped place with good ventilation.
- Solid fuel dual-circuit boilers for the home require regular maintenance (cleaning the chimney, ash pan, combustion chamber, etc.).
- A chimney with good draft is required to remove combustion products.
- Irrational use of fuel in the summer (when only hot water is required).
- It is not possible to maintain and regulate 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 burning fuel in a boiler unit, the heat carrier is heated for both circuits. In the first, there is movement of water and its passage through heating devices, followed by its return to the boiler. The second circuit is designed for heating water for domestic purposes, which passes through the 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 the boiler, which will provide the possibility of heating water from the electric network during those periods when the equipment is not used for heating.
Two-circuit units on solid fuel pyrolysis or long burning are more effective. In the latter case, high efficiency is achieved through lower combustion, that is, lateral and lower air supply is made 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 of which additional heat is generated to heat the water.
Selection tips
When choosing a dual-circuit solid fuel boiler (reviews below), it is important to correctly calculate the capacity, that is, the need for additional heat output for heating domestic water.
To ensure year-round water supply 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, power and size. The choice depends on many parameters, including the necessary functionality, the area of the house, as well as the allocated budget. You need to analyze all the main characteristics in the aggregate.
Consider the most popular models of these devices.
Buderus, Logano S110-2
This steel equipment is designed for outdoor installation. It is quite compact and can be easily mounted even in a small room. The boiler has good power and does not cause problems during operation. To manage its work, just read the instructions.
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 customer reviews, the boilers last much longer, but subject to proper installation and timely maintenance.
Main characteristics:
- Country of origin - Germany.
- Unit power - 7-13.5 kW.
- Equipment weight - 154.9 kg.
- Types of fuel - wood, coal and lignite.
- The size of the chimney is 145 mm.
- Efficiency - 78%.
- The cost is approximately 35,000 rubles.
Atmos DC22S
This is a pyrolysis type of steel equipment that can handle the heating of a large area home. 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 specifications take up much more space. The unit is designed for wall mounting, which makes operation more convenient. It can be heated with ordinary wood, the volume of the combustion chamber allows you to lay pieces of large size.
Main characteristics:
- Country of origin - Czech Republic.
- The boiler power is 15-22 kW.
- Thrust - 23 Pa.
- Unit weight - 319 kg.
- Efficiency - up to 88%.
- The cost is about 110,000 rubles.
Dakon dor12
The following characteristics are characteristic of this equipment:
- Production - Czech Republic.
- Fuel - wood, coal.
- The size of the chimney is 145 mm.
- Equipment power - 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 design a dual-circuit heating system. Even before the start of construction, it is necessary to perform all the heat engineering calculations that are needed to determine the capacity of the boiler unit.