Heatingpannel 1750 watt
breadth 660 mm / altitude 440 mm / weight 6.0 kg
The formula for calculating the required capacity judging by cubic meters is as follows:
Number of cubic meters delta to heat (lxbxa) x T x heat insulation factor
the delta T is the difference between the outside temperature and the desired surroundings temperature (therefore at -5 outside and desired temperature of 20 is the delta T: 25
the heat insulation factor space isolated for a good is 1.2. For a moderately isolated space that factor 2 is and for a badly isolated space is that 3.3.
Therefore: a moderately isolated space of 5.5 x 20 meters and 4 meters high with an outside temperature of -5 and desired within temperature of 18 would ask will sit a capacity of 20.2
kW... at border cases rather always something higher (therefore 850W becomes 1000W).