The instructables one is nice and very cheap. However, they're pretty small collectors, only 2'x4' or 8 sq/ft. One of the 4'x8' panels is 32 sq/ft. To heat my ~750 sq/ft garage I was thinking I'd need at least three of the 4x8 collectors.
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Last edited by Daox; 11-03-10 at 09:08 AM..
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