What do you think is the smallest space that I could install a Tarm Solo 60 in? I'll be installing my boiler in a closet in a small arctic entry (mudroom) and space is at a premium. Whatever space I can save will be for wood storage. Is it possible to put one in a 4' x 6' closet with a 3' door on the 6' side? I'll be surfacing all walls with cement board or similar fireproof material. I imagined putting the boiler in "caddy-corner" so I'd have access to the firebox door. Thanks!