rocket mass heater

[paul wheaton]

While your soapstone stove will use less wood than a conventional stove, I suspect that a rocket mass heater will use less wood than the soapstone stove. I would bet that a rocket mass heater would use about a third the wood of the soapstone stove.

As evidence, I present:

https://www.youtube.com/watch?v=7hcZ1RvW440