Mechanical · M-FNRPJ

High Efficiency Gas Water Heater Piping Detail

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A high-efficiency gas water heater is mounted on a concrete housekeeping pad inside a safe pan with a one-inch open drain to a floor drain or sink. Natural gas piping features a gas cock and a six-inch dirt leg ahead of the manufacturer-provided gas train. Four-inch schedule forty PVC pipes handle combustion air and exhaust through the roof. Inlet and outlet piping includes a shut-off valve, strainer, aquastat, expansion tank per schedule, heat trap per energy code, and a pressure and temperature relief pipe routed to a drain. The hot water recirculation line incorporates a recirculating pump per schedule, check valves, unions, Weiss digital thermometers rated for fifty to two hundred degrees Fahrenheit, and a three-quarter-inch drain with a hose end.

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