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// CODE SNIPPET

504.4 Relief Valve

2017 FBC - Plumbing, 6th edition > 5 Water Heaters > 504 Safety Devices > 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.

504.4.1 Installation

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.

Related Code Sections


416.2.5 Gas Piping Installations, Relief Valve
Where a pressure relief valve is used to meet the requirements of Section 416, it shall have a flow capacity such that the pressure in the protected ...
2017 FBC - Fuel Gas, 6th edition > 4 Gas Piping Installations > 416 (IFGS) Overpressure Protection Devices > 416.2 Pressure Limitation Requirements > 416.2.5 Relief Valve
416.2.5 Gas Piping Installations, Relief Valve
Where a pressure relief valve is used to meet the requirements of Section 416, it shall have a flow capacity such that the pressure in the protected ...
2020 FBC - Fuel Gas, 7th edition > 4 Gas Piping Installations > 416 (IFGS) Overpressure Protection Devices > 416.2 Pressure Limitation Requirements > 416.2.5 Relief Valve
454.2.14.5 Special Detailed Requirements Based on Use and Occupancy, Relief Valve
When water heating equipment which is installed in a closed system has a valve between the appliance and the pool, a pressure relief valve shall ...
2014 FBC - Building, 5th edition > 4 Special Detailed Requirements Based on Use and Occupancy > 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
454.2.14.5 Special Detailed Requirements Based on Use and Occupancy, Relief Valve
When water heating equipment which is installed in a closed system has a valve between the appliance and the pool, a pressure relief valve shall ...
2017 FBC - Building, 6th edition > 4 Special Detailed Requirements Based on Use and Occupancy > 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
454.2.14.5 Special Detailed Requirements Based on Occupancy and Use, Relief Valve
When water heating equipment which is installed in a closed system has a valve between the appliance and the pool, a pressure relief valve shall ...
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
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