Lochinvar & A.O. Smith 100108683 Thermostat

The Lochinvar & A.O. Smith 100108683 Thermostat is a high-performance upper thermostat w/ ECO & cover designed for precise temperature regulation in residential and commercial electric water heaters. This WH10-A model features a patented bimetal sensor design that ensures maximum temperature sensitivity for consistent thermal cycling. Built for 240V configurations, it incorporates an integrated Energy Cut Off (ECO) high-limit switch, providing a critical safety layer by disconnecting power if tank temperatures exceed safe operating parameters.

As a genuine OEM replacement, the 100108683 is compatible with a wide range of Lochinvar, A.O. Smith, State, and American water heater models. The heavy-duty wiring terminals are engineered for a positive electrical connection, reducing the risk of high-resistance heat at the contact points. This unit replaces the obsolete 9001954015, offering an exact fit and simplified installation for field technicians. Note that this component is designed for standard electric tanks and should not be utilized on point-of-use models.

• Adjustable Temperature Control: Allows for field-tuning of water temperatures to meet specific site requirements.
• Integrated Safety ECO: Features a manual reset high-limit switch to prevent overheating.
• Enhanced Sensitivity: Patented bimetal positioning provides faster response times than aftermarket alternatives.
• Complete Protective Kit: Includes the terminal thermostat cover to ensure compliance with electrical safety standards.
• Broad Compatibility: Direct OEM replacement for Lochinvar and A.O. Smith series water heaters.

• How do I reset the high-limit switch on this thermostat? If the water heater stops producing hot water, check the red reset button on the upper thermostat. If it has tripped, press it firmly until it clicks. Frequent tripping often indicates a grounded heating element or a faulty thermostat.
• Is the 100108683 compatible with 208V systems? While optimized for 240V, most WH10-A thermostats are rated for use in both 208V and 240V residential electric applications; always verify against the heater's data plate.
• Does this include the lower thermostat? No, this is an upper thermostat specifically. For a full system overhaul, the lower thermostat (often a WH9 or similar) should be inspected and replaced separately.

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.