This Everbilt T-O-D Style Upper-Element Thermostat is the most popular upper thermostat used in residential electric water heaters. These water heaters often have a "non-simultaneous" design, which means that only one heating element is on at any given time. This type of thermostat is for use in 2-element water heaters. Features: Fits most brands: Rheem, Ruud, Richmond, GE, State, Kenmore, Bradford White, AO Smith, American, Craftmaster, Lochinvar, Reliance, GS Wood, Mor-Flo and Whirlpool For use in 2-element water heaters Replaces APCOM-style thermostats Temperature-sensitive bi-metal disc delivers snap action to the contacts Energy-efficient range setting from 90F to 150F Speed and force of contact separation provide a long-lasting, dependable performance at high electrical loads Durable metal and plastic construction Manual reset switch helps prevent overheating California residents see Prop 65 WARNINGS 1 year limited warranty