Rocket stoves are simple stove designs that use a small amount of combustion material (wood) and create a hot burn. The ultimate would be a rocket mass heater. We are building several rocket stoves with the hopes of building a rocket mass heater for ether the house or the greenhouse.
We built a one gallon top lit updraft stove one rainy afternoon. Our fuel is wood pellets which burn for about one hour. Once you see the flames at the bottom the fire can be extinguished and the remaining char can be used as biochar to enrich your soil. If left to burn completely the remains are a fine white ash.
Enjoy the video. We had fun making it.