Ao Smith 100110951 Probe Eco Thermostat

Product Description

The AO SMITH 100110951 is a probe-style ECO (Energy Cut-Off) and thermostat assembly designed for water heating applications. This component serves a dual function: it monitors water temperature and activates the heating element, while the ECO safety device cuts power if the water temperature reaches an unsafe level. Installed inside the water heater tank or mounted on the heater body, this replacement part restores proper temperature regulation and high-limit protection to a system that has lost accurate thermal control. Plumbers and water heater service technicians handle this repair as a standard field replacement.

This part is rated for heating applications and is classified as a direct replacement component. It is suited for residential water heater service where the original thermostat or ECO has failed, resulting in no heat, inconsistent temperatures, or nuisance tripping. Technicians typically encounter this failure mode during routine service calls on storage-tank water heaters. No compatibility with specific model numbers is stated in the available product data.

Key Features

• Dual-function probe assembly combines thermostat and ECO high-limit cutoff in a single unit
• Designed as an OEM replacement part to restore factory thermal regulation
• Probe-style design for direct immersion or surface-contact temperature sensing
• Heating application rated for standard water heater service conditions

Compatibility

Designed as an OEM-style replacement for AO SMITH water heater thermostat and ECO assemblies in heating applications. No specific compatible model numbers or system families were provided in the available product data.

Installation Notes

Installation of this thermostat and ECO assembly should be performed by a licensed plumber or qualified water heater service technician. Always disconnect electrical power to the water heater at the breaker panel and shut off the cold water supply before beginning any service work. Follow all applicable local codes and the manufacturer service documentation when replacing thermostat or high-limit components. Never restore power to the unit until all wiring connections are secure and the tank is fully filled with water.

Technical Specifications

• Application: Heating
• Part Type: Replacement Part

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100110951