Reply by Gene Howe

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Posted on solar heating

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Gene Howe

11873 posts in 3972 days

#1 posted 03-17-2012 03:01 PM

Depends on the area you want to heat. Maybe two fans??
I’ve seen the arrangement you describe used for supplementary water heating. That unit was 12X6. I imagine it was that large to provide plenty of area for the copper piping…more pipe, more heated water.
I use a ProComm propane unit in my 24X36 shop. At $200, I couldn’t build anything that would give me the same heat. BUT, the propane is an ongoing expense.

-- Gene 'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton

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