Upper Thermostat — Therm-O-Disc

Electric Water Heater Upper Thermostat

• 40A 120-277V AC
• 25A 480V AC
• With High-Limit Control Reset Button
• Surface Mount
• Fits most brands of water heaters
• Adjustable temperature range: 110° F to 150° F
• Therm-O-Disc Brand

This type of thermostat is for use in 2-element water heaters, in the upper position. These water heaters often have a “non-simultaneous” design, which means that only one heating element is on at any given time.

— Double Element Thermostat Info Page