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Potential issues with PEX plumbing and copper manifolds?

Has anyone had experience with issues where PEX plumbing is used with copper manifolds? Especially on the hot side.
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October 30 2011 - US
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Answers (4)

Profile picture for sunnyview
"PEX is comparable if not superior to copper if installed properly "

PEX is not superior to copper and you saying that is ridiculous. PEX has not been shown to last in houses for 50+ years, has not been shown not to leak agents into the water over long periods and is not preferred by buyers either on new houses or resale.

PEX is cheap to install. Plumbers/builders looking for higher profit margin like it, but it is new. All new building systems should be treated as crap until they are proven to stand the test of time. Just ask all the chinese drywall people or the people that were sold EIFS as super efficient houses. Didn't quite live up to the hype and now they have ongoing issues.
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July 03
Profile picture for XwpisONOMA
PEX is comparable if not superior to copper if installed properly (which is true with all products).

The report referenced by Toan Nguyen is not conclusive merely a recommendation based on up to that date findings and most certainly it is not based on scientific research just local authorities investigatons (there is a huge difference).

Most of these class action lawsuits have been settled and any defects found in PEX or fittings rectified. PEX tubing (again if installed per manufacturer's guidelines) has a 25 year warranty on the tubing and 10 year warranty on the fittings. This is not to say consumers will experience failure after that. It is meant to emphasize that if there is a defect in the product it will manifest earlier than the warranty times out while if there are no problems untill that time then PEX and its fittings have been stress tested for an estimated service life of up to 100 years!

Finally, I would take this report with a (big) grain of salt, like pretty much anything else coming out of this safety hyper-conscious and environmentally-"crazy" state. Plus, you should read all the negative responses this report received by a diverse group of parties that would -admittedly- have an interest in the approval of PEX.

My conclusion is that PEX should not be outlawed because local government who are lobbied by unions say so, instead put it to test by allowing selective installations by fully certified professionals and then, constantly monitor closely how well (or not) these installations performed over time.

Do not spread rumors because that benefits our own agenda.
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July 03
Research has shown that PEX not only has potential health hazards for the end users, as the Drafted Environmental Impact Report has shown, but also fails after a few years in use.  These failures have occurred nationwide and have resulted in numerous class action lawsuits...

Those are not my words, they are from this report.
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December 07 2011
Profile picture for sunnyview
I have a tiny tie in of PEX to the copper lines for the water heater and for one out side hose bib that was rerouted. There have been no problems in about 3 years, but I still eye the tie suspiciously. Secretly since the areas are so small, I wish I had kept it all copper.
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October 31 2011
 
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