Lochinvar & A.O. Smith 100109281 Burner Assembly

The Lochinvar & A.O. Smith 100109281 Burner Assembly is a high-performance OEM natural gas burner designed for Flammable Vapor (FV) ignition systems in residential and commercial water heaters. Featuring a precision-drilled #33 orifice, this assembly ensures optimal fuel-to-air ratios and consistent thermal output. It serves as a direct 100109281 replacement part for AOSmith, State, and American water heater models requiring a 6-inch diameter burner footprint. Built for durability in high-cycle environments, the 100109281 burner assembly is engineered to meet strict natural gas water heater burner standards, facilitating reliable ignition and stable flame patterns. For technicians managing combustion system repairs, this FV burner assembly provides a drop-in fit, maintaining the sealed integrity of the combustion chamber. When replacing the manifold or burner, always verify the #33 ORF technical specification against the unit’s data plate to ensure proper BTU firing rates and safe operation.

• Precision Orifice: Includes a factory-installed #33 orifice for calibrated natural gas delivery and efficient combustion.
• OEM Compatibility: Authentic Lochinvar and A.O. Smith component ensuring exact fitment and mechanical reliability.
• Enhanced Safety: Designed specifically for Flammable Vapor (FV) ignition systems to maintain sealed chamber integrity.
• Durable Construction: Heavy-duty materials built to withstand thermal stress and resist oxidation during long-term operation.

Which water heater models are compatible with this burner?
The 100109281 is compatible with select A.O. Smith, State, and American water heaters. Always cross-reference your specific model and serial number to confirm this #33 ORF burner is the correct match for your unit's BTU rating.

Does this assembly include the manifold door gasket?
Usually, this focuses on the burner and orifice assembly. Because the combustion chamber is a sealed area, technicians should inspect the inner door gasket and replace it if the seal is compromised during installation.

Can I use this burner for Propane (LP) conversions?
No, this assembly is strictly for Natural Gas (NG) applications. Using this burner with LP gas without proper conversion components is unsafe due to the specific flow requirements of the #33 orifice.

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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.