High-Limit Upper Water Heater Thermostat Tod StyleThis replacement thermostat is designed for use with double element water heaters. It offers an energy efficient adjustable temperature range from 90 degrees F to 150 degrees F. The Therm O Disc style thermostat is equipped with a built in safety switch that prevents the water heater from overheating. UL listed. Built for compatibility with most brands of water heater manufacturers. 59T SPDT 66T Therm O Disc style thermostat 120 240VAC High Limit