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504.4 Relief Valve
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Storage water heaters operating above atmospheric pressure shall be provided with an approved, self-closing (levered) pressure relief valve and temperature relief valve or combination thereof. The relief valve shall conform to ANSI Z21.22. The relief valve shall not be used as a means of controlling thermal expansion.
Such valves shall be installed in the shell of the water heater tank. Temperature relief valves shall be so located in the tank as to be actuated by the water in the top 6 inches (152 mm) of the tank served. For installations with separate storage tanks, the approved, self-closing (levered) pressure relief valve and temperature relief valve or combination thereof conforming to ANSI Z21.22 valves shall be installed on both the storage water heater and storage tank. There shall not be a check valve or shutoff valve between a relief valve and the heater or tank served.
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2020 FBC - Building, 7th edition > 4 Special Detailed Requirements Based on Occupancy and Use > 454 Swimming Pools and Bathing Places (Public and Private) > 454.2 Private Swimming Pools > 454.2.14 Water Heating Equipment > 454.2.14.5 Relief Valve