Wood-fired stoves during their operation have a flue gas temperature at the outlet of about 280-390 degrees, while the heat is released into the atmosphere. Heat exchangers increase the efficiency of the furnace and increase the uniformity of heating the room. When using heat exchangers, the efficiency of the furnace increases, that is, less firewood will be used to heat the same volume of the room.
Installation of heat exchangers adds from 3 to 10 kW of thermal power. Thus, an additional one can be heated from 100 to 250 cubic meters of a room with the same amount of used firewood.