The Rheem-Ruud SP210239 Electric Lower Thermostat is a replacement temperature-control component designed for electric water heaters. It monitors the water temperature and regulates the lower heating element by switching power on or off to maintain the selected temperature. This thermostat helps provide consistent hot water, supports efficient heating operation, and prevents excessive... https://www.partshnc.com/sp210239-rheem-ruud-electric-lower-t-stat