Plumbing · P-F4VFH

Dual Gas Fired Water Heaters and Pump

Materials

Elements

Floors / Slabs Bracing Drainage Connections / Plates

About this detail

Dual gas-fired water heaters and an insulated vertical storage tank sit on a concrete equipment base with associated piping, valves, and safety controls. The entire assembly is routed to a nearest floor drain with a six-inch air gap via a drain pipe and drain valve, while dielectric unions are provided at tank connections for dissimilar metals. Twelve-inch wide by twelve-inch deep heat traps are installed at inlets and outlets as typical. A recirculation pump with union connections features a shutoff valve, aquastat, and strainer upstream, and a check valve and shutoff valve downstream. Additional hardware includes gas cocks, ground-joint unions, ASME temperature and pressure relief valves, automatic vacuum relief valves, and a three-inch long dirt leg on the gas supply line.

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