Reliance Lower Electric Water Heater Thermostat for 2-Element Models (WH9) is specially designed to replace thermostats on most residential electric water heaters, including models No. 7025, No. 8025, No. WH5, and No. WH-7. This thermostat is preset at 120°F but can be easily adjusted within a range of 110°F to 160°F to suit your heating needs. It features a Safety Energy Cut Off (E.C.O.) that automatically cuts power to the heater if the internal tank temperature reaches 190°F, ensuring safe operation. Compatible with water heaters using Apcom, Robertshaw, and Therm-O-Disc thermostats, this UL-listed thermostat and E.C.O. provide reliable and efficient temperature control for your electric water heater. Model Number: 100108422