Masonry Stoves, Masonry Heaters and Masonry Fireplaces (also known as the Russian Fireplace), plus Masonry Ovens and Earth Ovens: How to design and build your own very efficient, low-cost masonry heaters, ovens, and earth ovens.
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
This picture is the best diagram of how this all works. It is from LowTech Magazine. If you want to build a cordwood home around this type of magnificent heating system, visit www.cordwoodconstruction.org