Lochinvar & A.O. Smith 100135290 Burner Assembly

The Lochinvar and A.O. Smith 100135290 Burner Assembly is a direct OEM replacement engineered for high-efficiency commercial water heaters and boilers. This assembly, cross-referenced as BNR3400, features an integrated pressure tap for precise manifold pressure adjustments and diagnostic testing. Designed for optimized gas-air mixing, this replacement burner assembly ensures stable flame patterns and consistent thermal output in demanding hydronic systems. It is compatible with specific Lochinvar Knight and A.O. Smith Cyclone models, maintaining the original equipment manufacturer's airflow specifications to prevent resonance or combustion instability. For field technicians, this HVAC burner part simplifies the restoration of commercial water heater combustion cycles. Utilizing high-grade materials, the 100135290 is built to withstand the high-temperature environments of condensing boiler systems, ensuring long-term operational reliability and meeting strict emissions standards during the combustion process.

• Direct OEM Compatibility: Replaces BNR3400 and 100135290 seamlessly within Lochinvar and A.O. Smith units.
• Integrated Pressure Tap: Allows for immediate measurement of gas flow and manifold pressure during commissioning.
• Optimized Combustion: Engineered to provide a uniform flame spread, reducing heat exchanger stress and improving efficiency.
• Industrial Grade Construction: Built to handle the rigorous duty cycles of commercial condensing heating systems.

Is the 100135290 interchangeable with the BNR3400?
Yes, the 100135290 is the current part number and is technically identical to the BNR3400 burner, making it a drop-in replacement for existing configurations.

Does this burner assembly include the pressure tap?
Yes, this specific Lochinvar burner assembly comes equipped with a pressure tap to facilitate accurate gas pressure readings at the burner manifold.

What causes a burner assembly to fail in commercial boilers?
Common failure points include mineral buildup, cracked ceramic diffusers, or warped metal due to improper gas-to-air ratios. Installing a 100135290 restores the required combustion performance.

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.