Water heaters are available from many manufacturers, such as A.O. Smith, which can have different options for adjusting the temperature of the unit. Adjusting the temperature can be done to increase or decrease the temperature of the water that may be needed for a bath or shower. The temperature for an A.O. Smith water heater can be adjusted by first determining the optimal temperature level required.
Turn off the power to the heater by turning off the circuit from the circuit box.
Locate the two access panels for the water heater. One is near the middle of the unit, and the other is towards the bottom.
Remove the screws that are used to secure the access panels with a flat head screwdriver.
Place the flat head screwdriver into the groove on the adjusting knob and turn it to the temperature setting that is needed.
Replace the access covers and tighten the screws to secure them in place.
Turn on the power to the water heater to complete the project.