hi i am thinking of fitting a wood burner stove but i have a suspended timber floor and want to know hearth thicknesses in the uk (building regs) i have read that i can buy one on legs and do not need to make the hearth so thick, any answers would be most appreciated, also my room size is 17 foot long by 14 foot wide by 7foot 6 inches high i have 2 doors in the room and a 8 foot by 6 foot window in one wall what kilowatt output stove would i need,thanks.