12 rocket heaters - burning wood 5 to 10 times more efficiently

I meant to put this together two months ago and am finally getting around to doing it.

I went to a workshop where we played with fire for two days. There were several instructors and the primary instructor is the author of Rocket Mass Heaters: Superefficient Woodstoves YOU Can Build.

While I was there, it was clear that this guy had built an awful lot of these. There were several right on the property. I was able to capture most of them in the video mode on my crappy camera.

And now, here is my collection of video bits ...

http://www.youtube.com/watch?v=LfKHVoCY2so