I am knew to the whole wood boiler thing. I might be purchasing a new indoor one and putting it in my garage. My question is what size do I need. I really like the econoburn and tarm boilers. How many btu's would I need? My house is 1800 sq.ft. my basement is about 900 sq. ft. and I would also like to heat my garage with it. Its a 2 stall garage with a work shop in the back. Any advise would be appreciated.