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Ok to use Hempcrete as mass for rocket stove mass heater?

 
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I searched but couldn't find a topic that addressed this. I want to put a rocket stove mass heater in a skoolie, but don't want the weight of fully conventional. Can hempcrete be used instead of the mainstream materials?

Thanks in advance.
 
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The mass is the point; using less-dense material will probably reduce the heat-storage capacity and possibly insulate instead. I would just use a thinner layer of cob or masonry around your heat exchange element, and enjoy the reduced footprint.
 
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