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Does anyone remember a post on the CI website several years ago that discussed a home-made stove that used much less wood?  As I remember, it was made from a metal barrel with a little trap door at the bottom to add wood.   I've looked online but haven't seen anything quite like it.  The best feature about it was that it required much less wood and retained heat longer.   The top of the barrel was used as a stove-top.  

Try searching David2051’s posts for the Eco Stove.

https://www.prnewswire.com/news-releases/children-international-provides-stoves-that-save-lives-in-latin-america-204074931.html

THANK YOU, THANK YOU, THANK YOU!!!  Your replies led me to the video of CI's efficient stove in Latin America, and the Stove Team International.   Bless you all.

Oh..those are called Rocket Stoves! There are many, many versions of these. I made one of cinder blocks one time when camping. Google pictures of rocket stoves. They certainly burn hotter with much less wood needed.

Yes, they are rocket stoves.  I've looked at multiple instructions online for making them, and wonder if there's an effort to help people make them in CI areas that aren't in Latin America.  

Anyone , anywhere, in the world who can get to a computer, may type in "rocket stoves videos"and obtain video instruction for near 24/7.