Section 408.4291. Indirectly heated hot water supply tanks.

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When a hot water supply is heated indirectly by steam in a coil or pipe, the pressure of the steam used shall not exceed the safe working pressure of the hot water tank, and a relief valve of at least 1 inch in diameter, set to relieve at or below the maximum allowable working pressure of the tank, shall be applied on the tank.

History: 1979 AC.

                    
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