The Lochinvar & A.O. Smith 100291049 Temperature Sensor Assembly is an OEM replacement component designed for compatible 2-4CH SA-10K commercial water heaters and water heating systems. It uses a 10K thermistor to detect water temperature changes by adjusting its electrical resistance and transmitting signals to the equipment's control board. This allows accurate temperature monitorin... https://www.partshnc.com/100291049-lochinvar-ao-smith-temp-sensor-assy-2-4ch-sa-10k