The water heater temperature is shipped with both thermostats factory preset at 140ºF, unless specified differently by federal or provincial regulations. The equipped adjustable thermostats on your water heater have a linear relationship between degrees of angular rotation and the corresponding change in temperature. Thus, rotating the temperature adjustment indicator 30 angular degrees will result in a 10ºF change in the water temperature.
Follow these steps when adjusting the temperature:
TURN OFF THE ELECTRICAL SUPPLY. Do not attempt to adjust thermostat(s) with the power turned on.
Remove the thermostat access panels and foam covers from the thermostats. Do not remove the plastic personal protectors covering the thermostats.
Using a flat tip screwdriver, rotate the adjusting knob to the desired temperature setting.
Replace the foam covers and access panels, and turn on the heater’s electrical supply