Lochinvar & A.O. Smith 100208545 Thermostat

The Lochinvar & A.O. Smith 100208545 Thermostat Sensor is a precision-engineered DHW temperature probe designed for high-performance domestic hot water applications. Built for industrial-grade reliability, this 120V NTC sensor operates within an extensive range of -20 to 150 degrees Fahrenheit, providing the accurate resistance feedback required for modern control boards to maintain tight setpoint tolerances. As a direct replacement for the Lochinvar TST20015, it integrates seamlessly with Lochinvar GIT040, SIT050, and SDT119 models, as well as A.O. Smith commercial water heaters. For technicians, this OEM water heater sensor ensures stable thermal regulation, preventing common cycling issues and protecting the heat exchanger from overheating conditions. Its rugged construction is purpose-built for demanding mechanical rooms, offering long-term stability and consistent signal output to the primary intelligent control system, effectively reducing troubleshooting time and ensuring peak system efficiency for the end-user.

• Precise Thermal Monitoring: Accurate sensing from -20°F to 150°F for optimized domestic hot water control.
• Broad Compatibility: Drop-in replacement for TST20015 across multiple Lochinvar and A.O. Smith series.
• Enhanced System Reliability: Industrial-grade 120V design prevents overheating and extends the lifespan of the heating unit.
• Simplified Installation: Standard threading and lightweight design allow for rapid field replacement by licensed contractors.

• Is this sensor compatible with my specific water heater model? This sensor is verified for use with Lochinvar and A.O. Smith units, specifically those requiring the 100208545 or TST20015 part numbers, common in SIT, GIT, and SDT series.
• How do I test the 100208545 for proper operation? Use a multimeter to check the resistance (ohms) against the manufacturer's temperature-resistance chart; a drifting or "open" reading typically indicates a failed probe.
• Does this require a professional for installation? Yes, per manufacturer guidelines, this 120V component must be installed by a licensed HVACR contractor to ensure proper calibration and safety.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.