I have a 11kw stove, 3kw of this goes to the room, the rest goes into the central heating system, we work five days a week so it’s only used in the evenings and weekends, we’ve used about 5 cubic meters over this winter and it’s cost has been about £300.
A 7kw fire in a small front room is going to be like a Swiss sauna, have the installers worked out the correct size stove for your room?
My front room is 18′ x 13′ and 3kw was all that was recommended.