I've seen a bunch of Garn installs going into good size buildings but am wondering if anyone has built one specifically to house the Garn and do nothing else? My install will be a a few steps outside a walkout basement door. I am thinking a block building with one side framed for the boiler to slide in and out (should it ever be necessary). Side man door to get in and out to load the boiler with a through the roof loaded wood crib opposite the boiler. So, you walk in the door and the boiler is on the right, wood crib on the left and something like a Bilco door through the roof to dump wood in with a small loader. For insulation/walls, I am thinking foam board on the inside of the block with some kind of fireproofing. The idea then is to have the boiler in a small highly insulated space with the boiler covered only minimally with a blanket. As far as height, would there be a big advantage to getting the top of the boiler high enough that it is above the main floor loop or am I going to need a heat exchanger for the whole building anyway?