Where is the reset button on a Rheem hot water tank?

The reset button on a Rheem hot water tank is located on the thermostat and high-temperature limit switch assembly behind an access panel on the side of the tank, and the exact location differs slightly between electric and gas models. On a Rheem electric water heater, which has two heating elements, there are two access panels on the side of the tank, one upper and one lower. The reset button, also called the ECO or Energy Cut Off button, is typically behind the upper access panel. Turn off power at the breaker first for safety. Remove the metal access panel cover with a screwdriver, then peel back the insulation to reveal the thermostat. You will see a red button in the center of the thermostat. If it has tripped, it will be popped out. Press it firmly until it clicks. On a Rheem gas water heater, there is no traditional red reset button like on electric models. Instead, gas models have a thermal switch or FVIR reset and the gas control valve may have a status light. If the high-temperature limit trips on a gas model, you may need to press a small resettable thermal switch located near the burner access door or reset the gas control valve by turning it off and on. Always consult your specific model's manual because pressing the wrong button can be unsafe.