Share 'Rocket mass heater workshop'

Greetings! I attended the rocket mass heater workshop over the weekend and it was really cool....er warm. We built a rocket mass heater in and for Mike Long's greenhouse. The foundation for the stove was built out of gravel and concrete chunks with a layer of cob on top. The basic fire box and the extra support ring were built out of fire bricks stuck together with cob, which is a mixture of 1…