This is the first time I ever heard of one. I brought it up on the web and really don't under stand too much about it or how well it works. It looks like it uses small wood so I was just wondering how often you would have to feed this heater. The rocket heater looks like a cheap home made heater to get by with. I heat with air tight wood heaters now, my house, my shop, and camp. I know I can go through a lot of wood in a winter season, but also I can go over night without feeding the heaters. I would have to see a rocket heater work in the cold climate where I live to have any interest in one. I sure would be all for something that is better then I have now. I have been thinking about going to a coal or wood pallet heater which I see are become very popular and looks like less work them wood heaters.