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A peek at my first 2 RMHs, question about next one

 
Posts: 36
Location: Near Jeffrey's Bay (the surf mecca!), South Africa
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First post from me. Hello!

This was my first RMH build. Heated a 12 sq. m. cabin wonderfully, but the flue exited top back, so in hindsight it was quite inefficient:



Second one for a steam room / sauna; same design as first, but bigger burn chamber; also works excellently:





Third project on the cards and I want to increase efficiency by adding a brick bell. Here is my extremely technical drawing:



I have played with the firebricks for the riser; imagine a brick bell on the left, as in the design drawing:



Here is the burn chamber:



Is the hole at the top of the riser big enough, or too big, for the push into the brick bell?



 
What's that smell? I think this tiny ad may have stepped in something.
rocket mass heater risers: materials and design eBook
https://permies.com/wiki/188812/rocket-mass-heater-risers-materials
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