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Posts: 2,996
Reply with quote  #101 
I think the cpvc will last a long time, particularly if it's protected from UV. HOWEVER there is a big difference in the expansion rates of plastic and aluminum, and this puts a lot of stress on the silicone bond. Eventually this is likely to fail, causing a reduction in heat transmission from the fin to the tube. If the fins aren't mechanically fastened, the assembly may literally fall apart.

Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay


Posts: 101
Reply with quote  #102 
Earlier this year I was planning to build a collector using CPVC and the aluminum fins from UP truck center.

My idea was to use the fins upside down. Rip strips of polyiso to go under fins between the tubes.

The fins would keep the CPVC from warping and the aluminum would be wrapping the back of the tubes.

Of course all would be painted black.

Note: I didn't go through with it, I purchased copper and the fins.

Rhode Island

Posts: 1
Reply with quote  #103 
Ok new to this and would like to do this real soon. Can you tell or show rhe plumbing to a hot water tank inside the house as well is a pump needed to get the water to the inside hot water tank?. Also would glass or pexi be a good idea for the front to protect it from the upcoming winter. Thanks Dustin

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Posts: 1,086
Reply with quote  #104 
Welcome Dustin. Scott has several videos on his site (link) explaining the plumbing or you can find most of it here on the forum.
Both temperature rise and airflow are integral to comparing hot air collectors
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