It is for 2 halls. One has 3 metre high ceilings and needs 19kw of heat as it 16metres by 7 or something. The other is all is all over the place and has half 3 metre ceilings and half 10m ceilings with those plaque heaters hanging down. But they intend on extending the upstairs so all ceilings will be 3 metres high. And that is what I based my calcs on