Home » Products » Solid fuels » FKU » Technical data FKU 165 FKU 215 FKU 265 FKU 335 Nominal heat output with coke kW 4,9 20,9 25,6 32,6 Nominal heat output with wood/coal kW 12,7 16,2 20,9 25,6 Max. wood length cm 33 33 33 33 Fuel filling chamber dm3 57 57 82 82 Filling opening mm 360 x 170 360 x 170 360 x 170 360 x 170 Boiler weight kg 205 209 251 256 Depth T mm 775 775 975 975 Room depth TR mm 1775 1775 1975 1975 Flue gas tube connection mm 150 150 160 160