The standard in water line is copper, always has been, but it is expensive and generally used in commercial applications and premium installations. Plastic water line is far more common and with the advances in pipe composition, almost as durable.
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An Uponor plumbing system features Engel-method crosslinked polyethylene (PEX) tubing. This is a flexible plastic tubing product that has been used for more than 35 years in radiant floor heating, plumbing and fire safety systems.
Commercial hydronic multi boiler install with allied electric boilers