Rocket Stove Mass Heater. "heat your home with 80% to 90% less wood; exhaust is nearly pure steam and CO2 (a little smoke at the beginning); the heat from one fire can last for days; you can build one in a day and half; folks have built them spending less than $20"
Cob! 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."
HOW TO MAKE ENDLESS HOT WATER WITHOUT ELECTRICITY Using some recycled parts, a small rocket stove and coiled copper piping, you can heat and pump all the hot water you will ever need without electricity. This ingenious technique utilizes thermal siphon pumping to move the freshly heated water into the reservoir.