Lochinvar & A.O. Smith 100338899 Gasket

The Lochinvar & A.O. Smith 100338899 Gasket is a critical OEM replacement part engineered for high-performance Low NOx heating systems. Specifically designed for use as a Spark Rod BTL Gasket, this component ensures a high-integrity seal between the spark igniter assembly and the burner tube locator (BTL). As a veteran technician knows, maintaining a precise seal in the combustion chamber is vital for preventing gas leaks and ensuring consistent ignition electrode performance. This Kaowool insulation gasket is rated for extreme thermal cycles, providing the durability required for commercial water heaters and boilers. The 100338899 is the direct replacement for 100078822 (and alternate part number 321781-000), offering a seamless fit for legacy equipment updates. By maintaining the correct gap and alignment for the Low NOx spark rod, this gasket supports optimal combustion efficiency and helps keep emissions within strict regulatory limits. Always verify the burner assembly alignment during installation to ensure long-term operational stability.

• OEM Compatibility: Precision-molded to fit Lochinvar and A.O. Smith Low NOx burner configurations.
• Direct Supercession: Successfully replaces part numbers 100078822 and 321781-000 without cabinet modifications.
• High-Temp Material: Constructed from Kaowool to withstand intense combustion chamber temperatures.
• Emission Support: Ensures a tight seal essential for maintaining Low NOx performance standards.
• Reliable Ignition: Stabilizes the spark rod to prevent intermittent ignition failures and HVAC fault codes.

Is this the correct gasket for older 100078822 models?
Yes, the 100338899 is the official direct replacement for the discontinued 100078822 part number, ensuring full backward compatibility.

Which systems utilize the BTL Low NOx gasket?
This gasket is primarily used in Lochinvar and A.O. Smith commercial boilers and water heaters featuring Burner Tube Locator technology and Low NOx burner assemblies.

Does this part include the spark rod igniter?
No, this is the BTL gasket only. It is designed to be installed alongside the spark igniter assembly (such as 100271889 or similar) to ensure a proper seal.

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.