I have been thinking of putting an indoor wood boiler in a building in back of my house. I was thinking of putting it 70' fom the house and building it big enough to put water storage in the future. I am thinking the building will not be any higher then 8' to 10' tall. Will I get enough draft with say 10' of chimney? Is there a formula for chimney height before I start building? The boiler room is going to be insulated with a concrete slab. Any other suggestions?