Plumbing · P-5A63H

Electric Water Heater Piping with Recirculation Detail

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An electric water heater is connected to the domestic hot water system with a hot water recirculation loop, expansion tank, and associated valving. The hot water supply line rises from the heater through a heat trap per energy code, a typical shut-off valve, and a dielectric union, with a pressure and temperature relief valve discharging through a full-size pipe to a floor line drain. The recirculation return line includes a time-clock-controlled hot water circulation pump, swing check valve, balance valve, and an expansion tank. Thermometers are installed on both the supply and return lines, and a drain valve is positioned near the base of the heater above the floor line.

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