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Can you connect CPVC pipe directly to a gas water heater?
Monday, November 19, 2018
CPVC water pipe is considered a combustible material—even though it will not burn unless subjected to an external flame source and, once the flame source is removed, it will not continue to burn. So, because it is rated as combustible, any CPVC pipe must be a minimum of 6 inches away from the draft hood and flue connector at the top of a gas water heater, based on Table 503.1.5 “Clearances for Connectors”, of the Florida Plumbing Code and International Plumbing Code. This means that CPVC cannot be dirrectly connected to a gas water heater next to the flue connector. An example of a correct installation is shown above.
Here’s what the Plastic Pipe and Fittings Association recommends in their “CPVC Piping Systems Installation Handbook."
And here’s an example of a water heater that is not compliant.
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