I've seen these things but haven't looked into it really. I can imagine they want big bucks for them. :monkey: So I let my cheap redneck ways take over and thought about a cheap 200 dollar tin shed with a grave floor. 20 ft. or so from the house. With a double wood burning 55 gallon drums inside. Heat ducks with blowers running into the house taking heat out of the shed with out the smoke. Sounds like a set up for well under 500 bucks to me. But then I see the word boiler...so it's a little more than that huh?