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Old 01-09-21, 04:41 PM   #2
skyking
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Join Date: May 2011
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My best guess is, your system is suffering from transportation losses. The collector temp is X, but you lose so much on the way back to the tank that you are pushing a rope uphill, so to speak.
I don't recall what you did to insulate the piping, but that is my guess nonetheless.
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