I saw one of these at a trade show last week. It uses the same gasification technology as most other gasifiers, but is designed to be installed outside. The dealer told me they work well, but run about $9,000. Like most other gasifiers, dry wood is the key. http://ka-lesdistributing.com/blue forge.html I also saw one of the Alternative Heating Systems indoor gasifiers at this show (the Lake States Logging Congress). It's the one built in Pennsylvania, not the one from New York with a similar name. Built like a tank, with all kinds of fancy refractory brick, a stainless steel firebox, cyclone, and who knows what all else. They were selling the display unit, a 130,000 btu/hour model at a "show special" price of $10,500. By comparison, my 205K btu EKO cost $6,000. But the build quality is on a whole different level. Probably like comparing a Camry with a Ferarri.