Ao Smith 100111304 Lower Thermostat Water Heater

Product Description

The AO SMITH 100111304 is a lower thermostat designed for residential electric water heater service. It monitors and regulates water temperature at the bottom of the tank, signaling the lower heating element to cycle on and off to maintain the set point. This component is a direct replacement part intended for installation by licensed plumbers or qualified water heater technicians. It is compatible with AO Smith model WH9C water heaters and is built to OEM specifications for reliable temperature control.

The 100111304 lower thermostat is used in residential electric water heater applications where the existing lower thermostat has failed or is producing erratic temperature control. The lower thermostat works in tandem with the upper thermostat to stage heating across the tank. It is installed on the lower element bracket behind the lower access panel. Model WH9C is a confirmed compatible application for this part.

Key Features

• OEM-spec lower thermostat for precise tank temperature regulation
• Controls lower heating element cycling to maintain set temperature
• Direct replacement part reduces installation time
• Designed for residential electric water heater systems

Compatibility

Confirmed compatible with AO Smith model WH9C electric water heaters. Designed as an OEM-style replacement lower thermostat for residential electric water heater applications.

Installation Notes

Installation should be performed by a licensed plumber or qualified water heater technician. Always disconnect power to the water heater at the circuit breaker before removing the access panel or handling any thermostat or element components. Confirm the replacement thermostat is rated for the voltage and wattage of the existing system before installation. Follow all applicable local plumbing and electrical codes during service.

Technical Specifications

• Compatible Model: WH9C
• Component Type: Lower Thermostat

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100111304