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Hot water heater overflow pipe code11/19/2023 ![]() ![]() Per the California Plumbing Code, for water heaters up to 52-gallon size, two straps are required. Be constructed of those materials listed in Section 605.4 or materials tested, rated and approvedfor such use in accordance with ASME A112.4.1. Gas-fired water heaters use fuel combustion for heat.Not have a threaded connection at the end of such piping.Terminate not more than 6 inches (152 mm) above and not less than two times the discharge pipe diameter above the floor or flood level rimof the waste receptor.Strapping shall be at points within the upper one-third (1/3) and lower one-third (1/3) of its vertical dimensions. (Effective January 1, 2014) FHRFirst Hour Rating, 1 ga13.7854 L, 1 gph1.05 mL/s. The water heater must at a minimum meet the storage requirements or the first hour rating (FHR) requirements of Table 506. Discharge to a termination point that is readily observable by the building occupants. The Uniform Plumbing Code (UPC), section 510.5 says In seismic zones 3 and 4, water heaters shall be anchored or strapped to resist horizontal displacement due to earthquake motion. Water heaters installed in residential occupancies shall be sized in accordance with Table 506 or the manufacturers recommendations.Discharge in a manner that does not cause personal injury or structural damage.16.00 and National Fuel Gas Code Handbook (Z223.2) 47.00 American Gas Association (A.G.A. ![]() A fifth pipe may provide an overflow drain Piping for solar water heater systems is described at SOLAR.
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