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It was the type of pex that has a layer of aluminum between the layers of plastic, it's designed that way to keep oxygen from being absorbed by the fluid, leading to faster corrosion.
but yes, a well designed system shouldn't have that type of problem, and part of that good design should be to use tubing that can handle high temperatures, the a solar collector is collecting alot of energy, it should be designed to handle it without creating a danger.
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