Lochinvar & A.O. Smith 100109251 Burner Assembly

The Lochinvar & A.O. Smith 100109251 Burner Assembly is a precision-engineered Natural Gas (NG) replacement component designed for Flammable Vapor Ignition Resistant (FVIR) water heaters. This high-efficiency final burner assembly features a #36 orifice and is critical for maintaining the stoichiometric balance required for clean combustion and optimal thermal transfer in residential and commercial units. As a veteran-grade OEM part, it ensures seamless manifold door assembly integration, facilitating reliable ignition and stable flame patterns. Designed to replace obsolete part numbers such as 9003467005, this assembly is a direct-fit solution for contractors servicing A.O. Smith and Lochinvar systems that utilize FV series technology. The robust construction minimizes energy wastage and supports long-term operational efficiency. Field technicians should verify the specific unit serial number to ensure exact compatibility with the combustion chamber footprint and manifold configuration before installation.

• Direct OEM Replacement: Ensures precise fitment and restores original factory performance levels without the need for field modifications.
• Optimized Combustion: Features a factory-calibrated #36 orifice for consistent natural gas flow and reduced emissions.
• FVIR System Compatibility: Specifically engineered to function within Flammable Vapor Ignition Resistant safety parameters.
• Enhanced Durability: Constructed with high-grade materials to withstand the thermal stresses of continuous cycling in water heating applications.
• Efficient Heat Transfer: Designed to maximize gas-to-water heating efficiency, lowering overall operating expenses for the end-user.

What water heater models is the 100109251 burner compatible with?
This assembly is primarily used in A.O. Smith and Lochinvar natural gas models requiring a #36 orifice. Because fitment depends on the production series, we recommend verifying your unit’s serial number against the manufacturer’s parts list.

Does this assembly include the manifold door gasket?
While this kit serves as the final burner assembly, technicians should always inspect the manifold door gasket and viewport glass during replacement and replace them if the seal integrity is compromised to maintain the FVIR seal.

Can this burner be converted for use with Propane (LP)?
No, this is a Natural Gas specific assembly. Using a natural gas burner with propane is hazardous; please source the specific LP-rated assembly with the correct orifice size for those applications.

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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.