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What is the best recommeded PEX connection system? I purchased a Milwaukee M12 ProPex expander but now I'm hearing some negitive feedback about Uponor. Not sure if I should return it.
Could you share the negative feedback you heard?

FWIW, I used Uponor and, following Daniel H's suggestion, used plastic fittings. (Thanks Daniel) Did use brass for the copper to pex adapters. IMO, it's important to install supports on tubing to eliminate sidewards pressure on fittings, to prevent micro-fractures due to expansion & contraction of the pex tubing.

HRG
 

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Based on the theory behind the expanding system, I would say crimping is ALWAYS a bad option. The whole idea of the expanding of the pex is that it always wants to return to it's original shape. What happens when you crimp it? Make it smaller? So then wouldn't it want to always go back to it's original larger size? Especially having the pressure inside helping, I don't think those crimp rings are going to last near as long.
+1

If water freezes in a crimp system, the metal crimp rings will be forced to a larger circumference. When ice melts, the rings will not contract.

OTOH, if water freezes in a Wirsbo/Uponor expansion system, the pex tubing and pex ring will expand but when the ice melts, the pex tubing and pex ring will both contract. The expansion method is superior in cold climates.

HRG
 
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