Lochinvar & A.O. Smith 100109825 Thermostat

The Lochinvar & A.O. Smith 100109825 Thermostat is a critical OEM replacement part designed for high-performance residential water heaters and select commercial boiler applications. Engineered for precision thermal regulation, this Lower Residential TOD (Therm-O-Disc) thermostat ensures accurate temperature sensing and high-limit protection within the gas train assembly or electric heating circuit. As a veteran-grade HVAC replacement control, it features a less degree setpoint configuration, making it ideal for maintaining specific storage tank temperatures while preventing dangerous overheating conditions.

When troubleshooting systems that exhibit short cycling or insufficient hot water, verifying the thermal continuity of the 100109825 is a standard diagnostic step. This unit is built to withstand the rigors of continuous operation in Lochinvar and A.O. Smith equipment, providing a reliable interface between the heating elements and the system controller. Integrating this genuine manufacturer part restores the energy efficiency and safety parameters originally specified by the factory, ensuring seamless water heater compatibility and long-term reliability on the job site.

• Precise Thermal Control: Utilizes Therm-O-Disc technology for accurate temperature setpoint management in residential tanks.
• OEM Compatibility: Guaranteed fit for A.O. Smith, Lochinvar, and State water heaters, eliminating the risk of mismatched aftermarket specs.
• Enhanced Safety: Acts as a reliable energy cut-off (ECO) to prevent thermal runaway and tank damage.
• Rugged Design: Built as a low-profile, lower residential TOD component to handle high-amperage heating cycles.

• Is this thermostat compatible with electric water heaters? Yes, the 100109825 is specifically designed as a lower thermostat for residential electric models where secondary temperature sensing is required.
• How do I verify if the thermostat has failed? Technicians should perform a continuity test using a multimeter across the terminals; a lack of continuity at room temperature typically indicates a failed internal switch.
• Does this include a manual reset button? This specific model is a TOD control; always check the specific equipment schematic to see if it works in conjunction with a separate high-limit switch.

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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.