They can be used for free and built for free out of sustainable earthen materials, and the results are a hotter flame with less fuel and less smoke. It's easier to start, maintain, and control a fire in a rocket stove than something like a grill. Even the fuel can be natural harvested or trash materials!
We’ve found that rocket stoves are easier to use when they’re elevated off the ground; there’s much less bending over. Quinn built a rubble base about a foot off the ground using using broken up cement. This is an abundant trash resource freely available in any metroplex, and he pieced it together with cob (made from straw, clay, sand and water).
2. Lay out the burn chamber in an L-shape
Use bricks to lay out the chamber and cob to hold it all together. Lay flat bricks across the top of the rubble base to make a level foundation for the stove’s chamber. Quinn lays the smooth side of the bricks for the inside of the chamber. He coats the sides with clay/cob to stick them together.
Notes: You could use cob alone to form the chamber, but we find it easier to bricks. Solid bricks work better than the modern style that has holes in it (see 0:55). This style cracks and break, as does concrete. The solid bricks can be heated to glowing without cracking and breaking.