On a well then?
Do you know how the pipe and fittings for this install were stored? Many speculate that UV light exposure could lead to problems with all PEX, but maybe Uponor more than others. Are the fittings that show yellowing exposed to indirect/reflected outdoor light or fluorescent or LED light fixtures? If there are any fittings in that install that are less exposed to any light, maybe compare them.
Regarding the yellowing, here's my amateur thought on this. I've seen a lot of images on line (not personal experience) of split and failed Uponor pipe. In every case, none of the failed pipe examples was free from yellowing... Is there a connection? I don't know.
John
My town water has no chlorine amazingly. Its town well water through UV sterlizer.
None if my pipes or rings get any sun. Which is why im surprised the 1in hot rings are getting pretty yellow. All basement with covered windows and LED lights maybe 30 min a day. In rhe barhroom burried in bath walls and under tub deck with no light exposure.
I stored all pipes in the white bags in a basement always. Fitting in my DeWalt organizer cases and those oddly arent yellow....
No cracks in pipe yet. I actually cut at one fitting to check after I saw the yellowing rings. Stretched the tube with my milwaukee m12 and no split....yet.
Since I have old tubing, im gonna make a closed test piece wirh rings and leave it in sun. See what happens.
