Where is the Water Heater Thermostat?

Your home water heater thermostat is not only important for your comfort, it's also important for your safety. Set too high, the hot water can scald. Set too low, bacteria can thrive. You need to know how to access your water heater thermostat so that you can keep your hot water at the optimum temperature for your particular needs.

Where is the water heater thermostat? Electric and gas water heater thermostats are in different locations.

On electric water heaters, there are two thermostats, upper and lower, both concealed behind metal access covers on the tanks. Before you do anything else, turn off the power to the water heater. Unscrew the two retaining screws in the first thermostat cover. Remove the door, and remove any insulation underneath it. The thermal controls will have a set screw for adjusting the temperature. Use a slotted screwdriver to change the setting. Your controls may be labeled with temperatures or may only indicate “Warm” and “Hot.” After setting the temperature you desire, replace the insulation and the access cover. Repeat for the second thermostat.

Make sure both the upper and lower thermostats are set to the same temperature! If they are not, the one set to the higher temperature may not switch on, while the other wears out from continuous use. It can also cause the water to heat more slowly, depending on which water heater thermostat is set lower.

Remember to turn the power on again after you're done.

On gas water heaters, the thermostat is easily accessible, on the front of the tank near the bottom, though on some models it may be concealed under an access cover.

Most gas water heaters have a combination control, with the main gas valve, the pilot valve and the thermostat together in one unit. The gas controls are clearly labeled. This thermostat, also, may not be marked with temperatures, but only indicate “Hot” and “Warm.” Turn the knob to the desired temperature setting. Replace the access cover, if there is one.

Adjusting the temperature setting of your water heater thermostat is easy once you know where it is and how to access it. Learn how, and make yourself familiar with the settings. It's a real step toward keeping your showers comfortable and your dishes clean!