Stove runs on solid fuel: braces, wood and wood waste, etc. The efficiency of the furnace is more than 75% due to the two-phase combustion of the fuel in the first stage, the fuel is decaying and highlights the furnace gases in the second stage furnace gases are completely burned up, thanks to one of the loading hopper is enough for continuous heating within 8-12 hours. Certificied in EU. EN 13 240:200