Lochinvar & A.O. Smith 100208762 Gasket

The Lochinvar & A.O. Smith 100208762 Gasket is a critical high-temperature seal designed specifically for burner sight glass assemblies in high-efficiency condensing boilers and water heaters. As a direct OEM replacement part, it ensures a gas-tight seal between the observation port and the combustion chamber, preventing dangerous flue gas leakage and maintaining proper combustion cavity pressure. This industrial-grade gasket is engineered to withstand the thermal cycling typical of intensive heating applications, replacing obsolete part numbers GKT2453, 100146553, and GKT2453K.

Precision-molded for a perfect fit, the 100208762 sight glass gasket is compatible with a wide range of professional equipment, including the Lochinvar Knight XL (models KB 399 through 800) and Armor Wall Mount water heaters. Maintaining a secure sight glass seal is vital for technicians to safely monitor flame patterns and ignition sequences without compromising the integrity of the heat exchanger housing. When performing annual maintenance on hydronic heating systems, replacing this burner observation gasket is a standard best practice to prevent seal failure and ensure peak HVAC-R system reliability.

Key Benefits

• Optimized Thermal Resistance: Fabricated from advanced materials to maintain seal integrity under extreme combustion temperatures.
• Broad Compatibility: Engineered for use in Lochinvar Knight XL, Armor, and various A.O. Smith water heater models.
• Safety Compliance: Prevents bypass of carbon monoxide and combustion byproducts into the mechanical room by securing the sight glass assembly.
• Direct OEM Fit: Eliminates the risks associated with generic seals, ensuring original equipment manufacturer tolerances are met.

Common Questions

When should this burner sight glass gasket be replaced?
We recommend replacing the 100208762 gasket whenever the sight glass is removed for cleaning or if there is visible evidence of hardening, cracking, or "blowing out" around the observation port.

Is this gasket compatible with older Lochinvar GKT2453 models?
Yes, this 100208762 gasket is the official superseding part for GKT2453 and GKT2453K, designed to meet the updated specifications for modern commercial boilers.

What happens if a sight glass gasket fails during operation?
A failed combustion seal can lead to inaccurate O2 readings, poor flame stability, and the leakage of flue gases, which may trigger safety shutdowns or damage surrounding HVAC components.

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.