Can Poly B connect directly to a water heater?
The straight answer
It should not. Common code practice keeps the first stretch from a water heater metallic, and the tank connection is where Poly B runs at the hottest end of its rating, which is where chlorinated hot water degrades it fastest. It is also the best place to check for the PB2110 stamp.
The longer version
The water heater is Poly B’s worst duty station: the hottest water, and heat accelerates the chlorine attack that degrades the pipe. Common code practice keeps the first stretch off a heater metallic, and manufacturers stamped warnings against continuous hot recirculation on the pipe itself. Practically, the tank is also the easiest identification point in the house: read the pipe at the connections. The identification guide shows what you’re looking at, and the failure chapter explains why heat matters.
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Grounding
This answer summarizes material sourced in full on the chapter pages it links. If the facts change, the chapter changes first and this answer follows.
Published by Poly B Plumbing Guys
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