Rocket Stoves are fuel efficient stoves, using a simple combustion chamber that's been designed to burn hot using only small amounts of wood that can be easily hand gathered.  Rocket Stoves are very popular with survivalists, minimalists & preppers because of their simple needs.  Rocket Stoves are great alternatives to gas stoves, because they run from renewable fuel sources and have virtually no moving components that can break. They also use very little wood, by comparison to a traditional open fire to produce the same result - ie - cooked meal, boiled water.