Lochinvar & A.O. Smith 100109273 Burner Assembly

The Lochinvar & A.O. Smith 100109273 Burner Assembly is a direct replacement component engineered for high-efficiency natural gas water heaters. This Nat FV burner assembly features a precision-drilled #37 orifice, ensuring optimal stoichiometric combustion and reliable thermal output. Designed specifically for Flammable Vapor (FV) ignition systems, this assembly maintains the safety integrity and thermal efficiency of compatible Lochinvar and A.O. Smith units. Proper installation is critical for maintaining correct gas manifold pressure and ensuring the pilot assembly and burner tray align with the combustion chamber specifications. As a field-ready solution for water heater repair, this assembly resolves common ignition failures and inconsistent flame patterns caused by clogged ports or degraded burner heads. Verification of the OEM part number 100109273 against the unit’s data plate is essential to ensure HVAC part compatibility and prevent operational issues related to incorrect gas-to-air ratios.

Key Benefits

• Precision-Engineered #37 Orifice: Calibrated for natural gas applications to deliver consistent BTU input and peak performance.
• FVIR System Compatibility: Designed to meet stringent safety requirements for Flammable Vapor Ignition Resistant water heaters.
• Durable Construction: High-grade materials resist thermal stress and oxidation in high-temperature combustion environments.
• Direct OEM Fit: Ensures seamless integration with existing gas valves and thermal switches for reduced downtime.

Common Questions

Does this assembly include the pilot and thermocouple?
This specific 100109273 assembly focuses on the burner tray and orifice; always check if your specific model requires a separate pilot assembly or if you should reuse the existing thermal components if they are within spec.

Can I use this burner for LP (Propane) conversions?
No. This assembly is strictly for natural gas units equipped with a #37 orifice. Using this on a propane system will cause hazardous combustion conditions and potential equipment damage.

How do I confirm this fits my A.O. Smith or Lochinvar unit?
Cross-reference the 100109273 part number with your water heater's specific model and serial number. It is commonly found in 40 and 50-gallon residential atmospheric vent models.

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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.