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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?

You would be much easier to understand if you took that bucket off of your head. And that goes for the tiny ad too!
rocket mass heater risers: materials and design eBook
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