Reliance Single Element Water Heater Thermostat with E.C.O. (WH9-6) is designed to replace thermostats on most residential electric water heaters, including models like WH2-4, WH5-4, WH7-2, WH7-4, as well as numbers 7025 and 8025 that feature a Safety Energy Cut Off (E.C.O.). This thermostat is suitable for double element heaters wired for simultaneous operation and is preset at 120°F, with an adjustable range from 110°F to 160°F. It includes a Safety Energy Cut Off that automatically cuts power to the heater if the internal tank temperature reaches 190°F, ensuring safe operation. Both the thermostat and E.C.O. are UL listed for quality and safety assurance. This product is compatible with water heaters using Apcom, Robertshaw, and Therm-O-Disc thermostats. Model Number: 100108425