Make a $4 emergency biomass stove from concrete blocks — 4 Comments

  1. A primary design principle of a rocket stove is to use low mass to increase heat transfer and reduce fuel use and emissions. Cinder blocks, masonry rock stoves, and Dakota trenches are energy thieves, meaning the high mass is stealing energy into the pot. A well designed rocket stove utilizes low mass insulation and may include even secondary combustion, heat shields, cast iron tops and other design improvements for boiling large pots of water with minimal fuel that a DIY cinder block rocket stove is incapable of performing.

    There are lots of other stove designs, such as TLUD stoves too, that have more advanced combustion principles that can perform these tasks without having to monitor and feed the stove continuously as well.
    Regards, SilverFire Stoves (

    • Yes, this is true. We’ve covered many other rocket stoves in previous blog posts. The link in my previous comment explains many of these things in detail. The cinder block/brick design is primarily for emergencies. It’s low cost and simplicity helps encourage people to jump in and start experimenting. All too often people read about this stuff but never do anything.

  2. This stove is so easy to do I might make one just for fun with some leftover firebricks. Some people in hot climates cook with these stoves to keep heat out of the house. They’re perfect for backyard get-togethers, backyard camping and canning garden produce. I saw a video of a lady who cooks this way all the time to save money and keep cooking messes outside. She gradually feeds really long branches into the stove so she doesn’t have to cut the wood. Rocket stoves work great with thin branches so you don’t have to buy firewood.

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