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Compost powered radiant floor heating

 
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Hi all, I saw a cool concept the other day about using the heat from compost to power radiant floor heating for a small area. This cought my attention because if it does work I have a very small cabin (144 sq ft) it should work perfectly in. My favorite part is that apparently if you position the pile just below the level of the floor to be heated, the closed system would circulate itself with no pump.does anyone know if this is true and if so how does this work?
 
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Brilliant idea - if it works! I have an unheated, uninsulated crawlspace-ish area under my bedroom at the north end of the house I rent. The wooden floor feels like ice in an ice skating rink in winter. I wonder if enough heat could be created from composting without the aid of solar energy from the sun, though. Hmmmm. I know how slowly compost decomposes outdoors in winter. So this gives me doubts.
 
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To answer your question how a closed heating system works without a pump, when water is heated it expands and becomes less dense. Therefor it will rise and the colder water in the pipe will be pushed downward where it will be heated and the cycle continues.
 
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