Lochinvar & A.O. Smith 100093749 Thermostat

The Lochinvar & A.O. Smith 100093749 Thermostat Kit is a critical OEM replacement part for maintaining thermal calibration in residential and commercial water heaters and boilers. Designed as a direct swap for the R110 control, this kit features a 1.5-inch shank and a 42.75K LP low-pressure sensor, ensuring precise signal feedback to the burner assembly. This thermostat is optimized for natural gas and propane (LP) fire-ups where precise temperature regulation is required to prevent rapid cycling or overheating. For contractors troubleshooting high-limit trips or erratic firing in A.O. Smith and Lochinvar units, this Robertshaw-style replacement provides the exact resistance values and 1/2" NPT fitment needed for a secure seal and accurate sensing. Built for industrial-grade durability, it maintains consistent setpoints in high-demand environments.

• OEM Compatibility: Exact replacement for part number 100093749 used across various Lochinvar and A.O. Smith commercial series.
• Precise Sensing: The 42.75K ohm at 77°F thermistor rating ensures the control board receives accurate data for tighter temperature differentials.
• Robust Shank Design: The 1.5-inch insertion length allows for optimal thermal contact within the tank or heat exchanger flow.
• Standardized Threading: Features standard 1/2" NPT threads to eliminate the risk of leaks during high-pressure operation.

Is the 100093749 compatible with older gas valves?
This thermostat kit is specifically engineered for unit models utilizing the 100093749 or R110 part sequence. Always verify the shank length and connector type on the existing sensor before installation.

Does this include the thermal paste or mounting gasket?
This kit typically includes the well sensor and shank assembly. We recommend verifying the condition of the dry well; if the well is damaged, ensure a compatible 1.5-inch well is used to maintain thermal transfer properties.

Can this be used for both residential and commercial units?
Yes, provided the part number matches the technical manual for the specific Lochinvar or A.O. Smith appliance. Its 42.75K sensor is a standard specification for many high-efficiency boilers.

This item is not eligible for free shipping.

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.