The thermostat for the Rheem PROE50 T2 RH95 Professional Classic Electric Water Heater is located behind the jacket access panel(s). This model has dual elements, so there are two thermostats—one for each heating element. If you need to adjust the temperature, you’ll need to remove the access panel(s) to reach the thermostats. Make sure to turn off the power to the water heater before doing any adjustments for safety.