Lochinvar & A.O. Smith 100111745 Silicone Gasket

The Lochinvar & A.O. Smith 100111745 Silicone Gasket is a critical OEM sealing component engineered for high-recovery commercial water heaters and condensing boilers. Designed to maintain the integrity of the burner blower assembly, this high-temperature silicone gasket provides a robust, leak-proof seal that prevents combustion gas bypass and ensures optimal thermal efficiency. It is a direct OEM replacement part for existing numbers 9007139005 and 197618-000, ensuring precise fitment and dimensional stability under extreme cycling conditions.

For technicians servicing A.O. Smith Cyclone BTH and Lochinvar Shield systems, the 100111745 is essential for routine preventative maintenance or complete burner overhauls. This water heater gasket is compatible with a wide range of high-input models, including the BTH 120 through 250 series and GDHE 50/75 units. Utilizing genuine HVAC replacement gaskets manufactured from premium silicone ensures the assembly remains airtight, protecting internal components from moisture and heat damage while upholding the unit’s original venting and combustion specifications.

• High-Temperature Resilience: Engineered from specialized silicone to withstand the intense thermal environment of commercial burner plates without degrading.
• Exact OEM Compatibility: Verified fit for A.O. Smith BTH (Cyclone), GDHE, and various Lochinvar high-efficiency condensing boilers.
• Leak Prevention: Eliminates the risk of exhaust gas leakage or vacuum loss in the blower housing, maintaining peak combustion performance.
• Durable Sealing: Maintains flexibility across repeated heating cycles, reducing the frequency of call-backs for seal failure.

• What units does the 100111745 gasket fit? It is primarily used in A.O. Smith BTH 120-250 and GDHE models, as well as several Lochinvar and State commercial water heaters.
• Can I use RTV silicone instead of this gasket? No. OEM gaskets like the 100111745 provide a specific compression thickness required for the blower assembly’s safety and performance standards.
• Is this an official replacement for part number 9007139005? Yes, the 100111745 is the updated manufacturer-approved replacement for 9007139005 and 197618-000.

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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.