Lochinvar & A.O. Smith 100208107 Gasket

The Lochinvar & A.O. Smith 100208107 Gasket is a high-duty rope gasket for door sealing applications, engineered specifically for commercial and residential heating systems. Designed as a direct OEM replacement part, this fiberglass rope seal provides a high-temperature thermal barrier that prevents combustion gas bypass and atmospheric air infiltration. Technicians typically utilize the 100208107 during scheduled heat exchanger maintenance or burner door inspections on models such as the SWA285L, SNA151-100, and SNR201-100. Its 0.04 lb lightweight density allows for a flexible fit within the door groove, ensuring a compressed, airtight seat that maintains system pressure and combustion efficiency. Replacing a worn Lochinvar boiler gasket is critical to preventing outer jacket overheating and potential sensor trips. This door seal rope is built to withstand the rigorous cycling of modern condensing boilers and high-efficiency water heaters, offering superior resistance to fraying and compression set compared to generic alternatives.

Key Benefits

• Precision Equipment Sealing: Engineered to fit the exact tolerances of Lochinvar and A.O. Smith burner doors, eliminating the risk of improper compression.
• Thermal Efficiency: Restores the airtight integrity of the combustion chamber to optimize fuel-to-air ratios and maximize BTU output.
• High-Temperature Resistance: Constructed from industrial-grade rope material designed to handle the localized heat of commercial boiler operation.
• Simplified Installation: Flexible rope profile allows for quick seating into the gasket channel, reducing labor time during flue-side maintenance.

Common Questions

When should the 100208107 rope gasket be replaced?
Standard industry practice dictates replacing the door gasket whenever the burner door or heat exchanger access panel is removed. If the rope appears flattened, charred, or brittle, it can no longer provide a safe seal against combustion gases.

Is this gasket compatible with other manufacturers?
While primarily used in Lochinvar and A.O. Smith units, it is cross-referenced for specific State and American Water Heater commercial models. Always verify the Part Number against the equipment's data plate before installation.

Does this seal require high-temp RTV silicone?
Most technician-led installations rely on the mechanical compression of the door bolts to seat the rope. Unless specified by the service manual for a specific model, supplemental sealants are generally not required and may interfere with the gasket's ability to compress and rebound.

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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.