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Old 04-18-12, 09:55 PM   #2
Apprentice EcoRenovator
Join Date: Nov 2008
Location: SW Montana
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You are probably aware of this already, but you want a steep tilt and only single glazing on the PEX collector to avoid stagnation temperatures getting high enough to damage the PEX.

This one is tilted at 70 degrees and still shows occasional stagnation temps as high as 230F, which is about a high as you ever want to go with PEX even in a non-pressurized system:
$1000 Solar Water Heating System -- Performance

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