Nominal heat output: 13,5 kW
Depth/Width/Height: 88x64x80 cm
Weight: 122 kg
Depth/width/height: 85x65x80 cm
Weight: 129 kg
Combustion chamber depth: 60 cm
Exhaust gas stubs: 15 cm
Unlike the Free Flow, the O-Model burns on an ash grate. The O-Models have no additional convection-back, there is as such no optional connection for an external combustion air supply.