Mechanical · M-XWHRQ

Non-Potable Electric Water Heater Detail

Materials

Elements

Walls Floors / Slabs Insulation Drainage

About this detail

An electric water heater is mounted on a four-inch concrete housekeeping pad over a galvanized steel drain pan with a three-quarter-inch copper drain line routed to the nearest drain. An incompressible insulated pad with a minimum R-10 value sits beneath the water heater. The tank includes a pressure-temperature relief valve and a vacuum relief valve installed six inches above the unit, with drain pipes routed full size to the nearest drain. Piping includes a heat trap with a minimum twelve-inch vertical drop, shut-off valves, unions, check valves, and a thermometer. A side loop connects an expansion tank with a three-quarter-inch capped drain. The domestic hot water supply line incorporates a temperature transmitter, circulation pump, balancing valve, and a reduced pressure principle backflow assembly located accessibly on the wall between thirty-six and sixty inches above the finished floor.

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