8 inch Batch-Box, a link to permies | Rocket Stoves.. Experimenters corner.. Answers questioned!
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Rocket Stove Science - Batch Box Rocket Mass Heater by קמין מסה kamin-massa | Facebook
Rocket Stove Science - I Fucking Love Rocket Stoves. Batch Box Rocket Stove by Peter Van den Berg. The heat exchanger formed by three oil drums stacked on top of each other