Rheem SP210239 Thermostat

Rheem SP210239 Water Heater Electric Thermostat

• How an Electric Thermostat Works1311.
• How to Replace an Electric Thermostat1312.
• Residential Electric Wiring Diagrams1315.
• Non Simultaneous Operation.

This Rheem Marathon Lower-Element Thermostat is specifically designed to be used as the lower thermostat in a Rheem Marathon residential electric water heater. These water heaters often have a “non-simultaneous” design, which means that only 1 heating element is on at any given time. This type of thermostat is for use in 2-element water heaters.