A.o. Smith 100108424 Water Heater Thermostat Eco Electric

Product Description

The A.O. SMITH 100108424 is a single-element electric water heater thermostat with an integrated Energy Cut-Off (ECO) safety device. It controls the heating element in residential electric water heaters by cycling power to maintain the set water temperature. The built-in ECO acts as a high-limit cutout, shutting off power to the element if water temperature exceeds a safe threshold. Rated for 120/240-volt operation, this thermostat is a direct service replacement suited for installation by licensed plumbers or HVAC technicians servicing electric water heating systems.

This thermostat is designed for use in single-element electric water heater applications. It corresponds to the A.O. SMITH model designation WH9-6 and is appropriate for standard residential storage-tank electric water heaters. Note: This thermostat is not rated for use on point-of-use model water heaters. Do not install this part on point-of-use units under any circumstances.

Key Features

• Integrated ECO (Energy Cut-Off) high-limit safety device shuts power off if water temperature exceeds the safe limit
• Compatible with 120-volt and 240-volt electric water heater systems
• Single-element design for standard residential storage-tank configurations
• OEM-style replacement for A.O. SMITH WH9-6 thermostat applications
• Not approved for point-of-use water heater models — installation on those units is prohibited

Compatibility

Designed as an OEM-style replacement corresponding to A.O. SMITH model WH9-6 single-element electric water heater applications. This thermostat is not compatible with point-of-use model water heaters.

Installation Notes

Installation should be performed by a licensed plumber or qualified service technician. Disconnect and lock out all electrical power to the water heater before removing the access panel or touching any internal components. Verify voltage compatibility before wiring the thermostat, and follow applicable NEC requirements for electric water heater servicing. Do not install this thermostat on point-of-use water heater models.

Technical Specifications

• Application: Water Heating
• Model Designation: WH9-6
• Voltage: 120/240 volts
• Element Configuration: Single Element
• Safety Device: Integrated ECO (Energy Cut-Off)

Standard Information

• Brand: A.O. SMITH
• Manufacturer Part Number: 100108424