How to Set the Temperature on an Atwood Water Heater

Open the hot water faucet at the sink closest to the water heater and run for several minutes if the water heater has not been used for at least two weeks; this allows any hydrogen gas present in the water line to be expelled. If hydrogen gas is present, it will sound like air moving through the pipe.

Turn the power switch on the water heater to "on." The water heater will attempt to light the ignition three times. If ignition fails, the unit will lock out. Turn the power off for 30 seconds and then turn back on.

Locate the control box on the front of the unit. Open the front access door.

Turn the thermostat control dial clockwise to increase the water temperature. Turn it counterclockwise to lower the water temperature.

Set the temperature control dial at 120 degrees Fahrenheit for the most economical setting. A water setting between 120 and 140 degrees Fahrenheit is recommended for most appliances that utilize hot water.