I have seen articles about Rocket Stoves in various magazines and I have wanted to build one. I finally got around to building one. It boiled water in 15 minutes and we tried it out to cook burgers. We used a cast iron pan and the burgers cooked up nicely. You need very little wood to keep the fire going. It makes a nice backyard cooker or one we can take camping. It is also a good emergency stove since anyone could probably gather enough wood around the yard in a pinch.