Lochinvar & A.O. Smith 100208106 Gasket

When you are opening up a Lochinvar Copper-Fin II or EnergyRite unit for a heat exchanger teardown, the Lochinvar & A.O. Smith 100208106 Front Header Gasket is a mandatory replacement item to ensure a gas-tight seal. This high-temp front header gasket, also identified under part numbers GKT2400 and GKT2400K, is specifically engineered for ASME certified commercial boilers and pool heaters. In the field, we see these gaskets fail most often due to soot buildup in the heat exchanger fins, which traps excessive heat and compromises the seal's integrity. Using an OEM replacement gasket prevents dangerous combustion leaks and maintains the thermal efficiency of the front header assembly. This part is compatible with a wide range of models, including the Lochinvar 402, 502, 652, and 752 series. For contractors performing annual maintenance, always verify the Lochinvar gasket is seated perfectly against the heat shield to avoid the nuisance leaks common in high-cycle water tube systems.

• Direct OEM Replacement: Replaces discontinued part numbers GKT2400 and GKT2400K with identical factory specifications.
• Thermal Resistance: Specifically formulated for ASME applications to withstand the intense operational temperatures of commercial Lochinvar heaters.
• Precision Fit: Designed for the 100208106 front header, ensuring a zero-gap seal between the heat exchanger and the external cabinet.
• System Reliability: Essential for preventing the escape of flue gases and maintaining proper boiler combustion air flow.

Which Lochinvar models use the 100208106 gasket?
This part is a standard requirement for Lochinvar EnergyRite pool heaters and Copper-Fin II boilers, specifically fitting ASME models such as the 402, 502, 652, and 752.

Is this the same as the GKT2400?
Yes, 100208106 is the current manufacturer part number and is exactly identical to the older GKT2400 and GKT2400K designations.

Why is my front header leaking?
Leaks at the front header gasket often indicate a clogged heat exchanger. When fins are soot-covered, heat cannot transfer to the water efficiently, causing the gasket to overheat and lose its sealing properties.

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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.