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Old 07-03-12, 12:50 PM   #9
Indyplumber
Lurking Renovator
 
Join Date: Jan 2011
Location: Indiana
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I was thinking of the same thing myself. I was going to DIY the collector and use an old 75 gallon water heater for storage and lay PEX under a 2' raised bed garden. Collector would be drain-back. I didn't think about insulating the sides of the bed though - good idea. Does the composting need a minimum temp to start breaking down? Anyway you might be able to get some 12v pumps to circulate though the collector and the radiant tubing and use a panel to charge the battery. You could EVEN get an 80 gallon electric water heater and just wire in the bottom element as a backup.
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