Rocket mass heaters can be build and sculpted with recycled and natural materials. A rocket mass heater offers great efficiency, artistic freedom and allow you to build your own with just basic construction knowledge. Find out more at www.naturalhomes.org/permahome/rocket-mass-heater-basics.htm
DIY rocket stove! "Rocket stove technology can heat a home with 90% less wood than a conventional wood stove. So little, that many homes are heated with nothing but tree trimmings that come out of a small yard."