Lochinvar & A.O. Smith 100110899 Ignitor

The Lochinvar & A.O. Smith 100110899 Ignitor is a high-performance hot surface ignitor designed for professional-grade water heater maintenance and repair. This 271Y silicon carbide ignitor features a 1.75-inch insertion depth, engineered to provide rapid, reliable ignition for commercial natural gas water heaters. As a critical combustion component, the 100110899 serves as the direct factory-authorized 9004504205 replacement, ensuring seamless mechanical and electrical integration without the need for field modifications.

Built for demanding environments, this OEM replacement part is compatible with A.O. Smith Cyclone BTH, SUF, and HCG series models ranging from 100,000 to 250,000 BTU. It is also a verified Lochinvar Knight part (100110899), providing precise thermal response to the control board's voltage output. Replacing an aged or cracked hot surface ignitor with this updated version restores efficient ignition cycles and helps prevent nuisance lockout codes in high-efficiency condensing water heaters. For HVACR contractors, this ignitor represents the standard for restoring factory-spec performance in Lochinvar and A.O. Smith gas appliances.

• Direct OEM Compatibility: Specifically engineered for A.O. Smith BTH 100-250 and Lochinvar commercial series to ensure proper fit and amp draw.
• Updated Performance: Serves as the official successor to legacy part numbers 9004504205, 192334, and 9006101205.
• Precision Engineering: Features a 1.75-inch insertion depth for optimal placement within the burner assembly, promoting stable flame rectification.
• Durable Construction: High-grade silicon carbide element designed to withstand frequent cycling in commercial applications.
• Universal Gas Support: Configured for use in both natural gas and liquid propane high-efficiency units.

What models are compatible with the 100110899 ignitor?
This part is the primary hot surface ignitor for A.O. Smith Cyclone BTH (models 100-250), SUF, and HCG series, as well as several Lochinvar commercial water heaters and Knight boilers. Always verify the part number against your unit's specific manifold data plate.

Can I use this to replace part number 9004504205?
Yes, the 100110899 is the current, updated manufacturer replacement for part numbers 9004504205 and 9006101205. It provides the same 1.75-inch specs required for these assemblies.

How do I know if my hot surface ignitor is failing?
Common signs include visible cracks on the silicon carbide element, an "Ignition Failure" error code on the digital display, or a lack of continuity when testing with a multimeter. Replacing the 100110899 typically resolves these issues if the gas valve and control board are functioning correctly.

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.