Ao Smith 100288279 Thermistor Kit Electric Tankless

Product Description

The AO SMITH 100288279 is a thermistor kit with O-ring designed for electric tankless water heaters. The thermistor is a temperature-sensing component that feeds real-time water or heat exchanger temperature data to the unit's control board, enabling accurate regulation of heating elements. This kit includes the O-ring required for a proper sealed installation. It is a direct service part intended for installation by licensed plumbers or qualified water heater technicians performing diagnostic repairs or component replacements on tankless electric units.

This kit is suited for electric tankless water heater applications where the thermistor has failed, drifted out of calibration range, or been physically damaged. Tankless units rely on accurate thermistor readings to maintain setpoint temperatures and protect against overheating. Replacing the thermistor as a complete kit with a fresh O-ring helps restore proper temperature sensing and prevents water leakage at the sensor port. This part is intended for residential or light commercial electric tankless installations.

Key Features

• Complete kit includes thermistor sensor and O-ring for a full service replacement
• Designed for electric tankless water heater platforms
• O-ring inclusion supports a leak-free seal at the thermistor port
• Direct OEM-sourced replacement for accurate temperature sensing performance

Compatibility

Designed as an OEM-style replacement thermistor kit for AO SMITH electric tankless water heaters. Consult the unit's service documentation or AO SMITH technical support to confirm fitment for your specific model before ordering.

Installation Notes

Installation should be performed by a licensed plumber or qualified service technician. Disconnect electrical power to the unit at the breaker and shut off the cold water supply before beginning any service work. Depressurize the system and drain the affected circuit as needed before removing the existing thermistor. Follow the manufacturer's service documentation for proper torque guidance and O-ring seating procedure.

Technical Specifications

• Component Type: Thermistor with O-Ring
• Application: Electric Tankless Water Heater
• Kit Contents: Thermistor, O-Ring

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100288279