Rheem Marathon Point-of-Use Series Use and Care Manual - Page 12

Operation After a very long shut-down period, the water heater's operation and controls should be checked by qualified service personnel. Make certain the water heater is completely filled before again placing it in operation . 6. DRAINING THE WATER HEATER - ! CAUTION ! DANGER The water drained from the tank may be hot enough to present a SCALD HAZARD and should be directed to a suitable drain to prevent injury or damage. Drain Valve Always shut off power to water heater before draining water. In order to drain water heater, turn off the power supply, then turn off cold water supply. Next, it is necessary to open a hot water faucet or lift the handle on the relief valve to admit air to the tank, and KEEP OPEN. Attach a garden hose to the drain valve on the water heater, and open the valve. Direct the stream of water to a drain where it will do no damage. (See Figure 12). Garden Hose Figure 12 - Draining the Tank Floor Drain (or other suitable drain) Notes 10