Lochinvar & A.O. Smith 100109203 Burner

The Lochinvar & A.O. Smith 100109203 burner assembly is a direct OEM replacement engineered for residential and light commercial natural gas water heaters. This FVIR burner kit serves as the updated factory successor to the 9003382005 burner, ensuring a precise match for units requiring a #33 orifice. Designed for Flammable Vapor Ignition Resistant (FVIR) technology, this assembly maintains critical combustion parameters and manifold pressure to prevent nuisance shutdowns and ensure stable flame characteristics. As a veteran-grade replacement burner assembly, it integrates the main burner tube, #33 gas orifice, and pilot hardware required to restore thermal efficiency in compatible A.O. Smith venting systems. Verify your specific unit’s serial number and model designation to ensure this natural gas burner aligns with your technical specifications for water heater repair. Proper installation by a professional is necessary to maintain the integrity of the combustion chamber seal and pilot assembly alignment.

• OEM Precision: Genuine 100109203 part ensures exact fitment, replacing the legacy 9003382005 without the need for manifold modifications.
• Optimized Combustion: Features a factory-calibrated #33 orifice for stable heat output and consistent BTU delivery in natural gas applications.
• Enhanced Safety: Specifically designed for FVIR-equipped water heaters to contain flammable vapors and maintain safe operational environments.
• Drop-in Compatibility: Streamlined design for professional contractors allows for efficient swap-out of the old burner assembly and pilot tubing.

Is the 100109203 interchangeable with the 9003382005?
Yes, the 100109203 is the official factory-updated part number that replaces the 9003382005 for all compatible A.O. Smith and Lochinvar models.

Which orifice size does this burner use?
This specific natural gas assembly utilizes a #33 orifice, which is critical for matching the gas flow requirements of your specific water heater model.

Can I use this burner for LP (Propane) conversions?
No, this assembly is strictly for natural gas water heaters. Using this burner in a propane unit creates an extreme safety hazard and will result in improper combustion.

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.