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An approved temperature relief valve shall be installed on all equipment used for heating or storing hot water and which forms part of a water supply system. When the temperature of the water within the vessel to which such relief valve is connected reaches 210oF, the valve shall automatically discharge sufficient hot water to prevent any further rise in the temperature. Each temperature relief valve shall be rated in terms of the maximum permissible hourly BTU input which the valve can safely relieve, and such rating shall be plainly stamped, etched, or cast on the valve or on a permanent nameplate securely attached to the valve. Temperature relief valves shall be installed in the hot water connection to the heater or storage tank in such a manner that the stem of the temperature-sensing element will project at least one inch into the tank.

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