Originally Posted By: kswift
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I have read in the codes (I think, ICC) that P/T valves are required on pool/spa heaters. However, I’ve always thought that pools and spas are not closed systems, because the surface of the water permits a release. In other words, it would be like requiring a P/T valve on a kettle, where the steam simply escapes through the spout. What am I missing? And thanks in advance for educating me.