Lochinvar & A.O. Smith 100109945 Thermostat

The Lochinvar & A.O. Smith 100109945 Digital Thermostat is the direct OEM replacement part for the legacy 9004570205 model. Engineered for precise water heater temperature control, this electronic thermostat is built to maintain tight differentials and ensuring optimal thermal efficiency in commercial and residential Lochinvar boilers and A.O. Smith systems. As a veteran-grade HVAC replacement part, it features high-precision thermistors that communicate directly with the appliance's control board to prevent overheating and maximize energy setbacks.

Field technicians will appreciate the "plug and play" compatibility of the 100109945 thermostat, which fits seamlessly into systems like the BCG3 65T300 series. By utilizing digital water heater sensors, this component provides more reliable data than manual predecessors, effectively mitigating common issues such as erratic cycling or insufficient hot water delivery. For contractors performing a water heater thermostat replacement, this genuine A.O. Smith digital control ensures the unit operates strictly within manufacturer-specified parameters without requiring complex field modifications.

• Direct OEM Compatibility: Specifically designed to replace obsolete 9004570205 and 194393-000 part numbers with a modern digital interface.
• Advanced Calibration: High-precision 10k thermistor integration provides accurate real-time feedback to the system logic.
• Energy Efficiency Optimization: Enables precise thermal management to reduce standby heat loss and operational overhead.
• Rugged Build Quality: Built by APCOM to withstand the high-temperature environments typical of commercial water heating applications.

• Is this compatible with my older A.O. Smith unit? Yes, the 100109945 is the officially designated update for the 9004570205. Always verify your serial number and check for any wiring harness changes.
• Does this require a separate thermistor probe? Depending on the specific system configuration (like the BTN series), you may need to inspect the existing upper and lower probes; however, the 100109945 handles the primary electronic regulation.
• How can I tell if my digital thermostat has failed? Common indicators include "loss of flame" error codes, erratic temperature fluctuations or "short-circuited thermistor" alerts on the main PCB.

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.