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The code requirement in most areas for the P&T relief plumbing is that it must be a material suitable for potable water plumbing - which in turn typically means it must allow a working pressure of 100psi at 180f. This might seem like an inadequate set of requirements for something intended to drain boiling water or steam, well over 180f, but the key term ...


The acronym for that pipe is PEX and they do have a hot water version but I wouldn’t do it. The drain is important, and the pressure relief is important and I would stay with a rigid material, something could happen to a plastic material causing it to collapse and then your pressure relief in your drainer isn’t going to be working properly.

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