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The A.O. SMITH 100108952 is a 180-degree lower thermostat designed for electric water heaters. It controls the lower heating element by sensing water temperature and cycling the element on and off to maintain the set point. This component is a direct replacement part used in residential electric water heater service. Licensed plumbers and water heater technicians handle installation as part of routine thermostat replacement or troubleshooting of heating performance issues. The thermostat is rated for the WH9C-6 model application and is not approved for use on point-of-use water heater models.
This lower thermostat is suited for standard tank-style electric water heater applications where dual-element, dual-thermostat configurations are used. It is installed in the lower thermostat bracket pocket on the tank body, behind the lower access panel. The part is intended for residential heating service and carries a specific restriction against point-of-use model heaters, which operate under different electrical and thermal parameters. Technicians should verify the model of the water heater before ordering to confirm fitment.
Designed as an OEM-style lower thermostat replacement for the A.O. SMITH WH9C-6 electric water heater model. Not compatible with point-of-use model heaters.
Installation should be performed by a licensed plumber or qualified water heater technician. Disconnect electrical power to the water heater at the breaker before accessing the thermostat compartment. The lower thermostat is located behind the lower access panel and is held in contact with the tank by a retaining bracket. Do not use this thermostat on point-of-use model heaters, as it is not rated for those applications.
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