I am a highly skilled and experienced home service professional. I recently completed a diagnostic on a Rheem water heater. The water heater was not producing hot water, so I performed a thorough inspection to identify the issue. I checked the power supply, gas line, and thermostat, and found that the thermostat was not working correctly. I replaced the thermostat and tested the water heater again, and it was now producing hot water. The customer was very satisfied with the work I performed, and I was able to resolve the issue quickly and efficiently.