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Is PEX Reliable?
PEX supply has been used for decades in other countries, where there are thousands of homes with 30-year-old, leak-free PEX. Most of the problems with PEX supply systems (in the United States and elsewhere) have been caused by sloppy installation or faulty fittings rather than the tubing itself.
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Can I Connect PEX to my Water Heater?
PEX can't be directly connected to a water heater. First extend a pipe 18 in. from your water heater and connect the PEX supply to the pipe.
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Which Tubing Should I Use for Interior Water Lines?
For water lines, there are three PEX supply grades: PEX-A, PEX-B and PEX-C. They're manufactured differently, PEX-A being slightly more flexible. If you're ordering online, go ahead and spend a few cents extra for PEX-A. But don't go running around town looking for it; the difference isn't that big. The plumbers we talked to would be willing to use any of the three types in their own homes. PEX is also popular for in-floor radiant heating systems, for which you need PEX supply tubing with an oxygen barrier.