Source  – resilientcommunities.com

– Building a rocket stove doesn’t get simpler than this. Four concrete blocks is all it takes to build this wind- and rain resistant rocket stove. The cost? $5.16.

The stove is fuelled by small sticks, twigs and leaves, and it funnels all the heat up under the bottom of the pan, using very little fuel in the process.

http://www.resilientcommunities.com/4-block-diy-rocket-stove/