Lochinvar & A.O. Smith 100110389 Burner Assembly

Maintain peak combustion efficiency with the Lochinvar & A.O. Smith 100110389 Burner Assembly. This genuine OEM replacement burner is engineered specifically for natural gas systems, featuring a precision-calibrated #21 orifice to ensure the exact manifold pressure required for stable ignition and heat transfer. In the field, burner degradation often leads to flame failure alarms or soot accumulation on the heat exchanger; replacing a warped or clogged assembly with this factory-spec 100110389 Nat Burner Assembly restores the proper venturi effect and flame pattern necessary for high-performance water heating and boiler operation.

Designed for professional-grade durability, this natural gas burner kit includes the burner tube and 21 PSI rated aperture components. It is a critical component for technicians performing standard maintenance or HVAC burner repairs on compatible Lochinvar and A.O. Smith units. Utilizing original manufacturer parts prevents common issues like improper air-fuel ratios and premature component fatigue. Ensure you verify the unit serial number to confirm this specific gas burner assembly matches your 1/4" or 3/4" manifold configuration before installation.

• Precision Combustion: Features a factory-tapped #21 ORF for consistent natural gas flow and optimized thermal output.
• OEM Compatibility: Exact Lochinvar 100110389 direct replacement ensures structural fitment without the need for field modifications.
• System Longevity: Helps prevent heat exchanger sooting and "hot spots" by maintaining a uniform flame distribution.
• Reliable Ignition: Engineered to work seamlessly with factory Hot Surface Ignitors (HSI) and flame sensors for rapid startups.

What are the signs that my current 100110389 burner needs replacement?
Technicians should look for visible "orange" tipping in the flame, heavy carbon deposits on the burner ports, or physical warping of the burner tube. These signs indicate incomplete combustion that can damage the refractory and heat exchanger.

Is this burner compatible with Liquid Propane (LP) systems?
No, this specific assembly is strictly for Natural Gas (Nat) applications. Using this assembly in an LP system without a certified conversion kit will result in hazardous operating conditions and equipment damage.

Does this assembly include the door gasket and mounting hardware?
While this kit focuses on the burner and #21 orifice, it is best practice to inspect the burner door gasket and mounting screws during removal. We recommend having replacement gaskets on hand to ensure a gas-tight seal upon reassembly.

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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.