Lochinvar & A.O. Smith 100165823 Pilot Assembly

The Lochinvar & A.O. Smith 100165823 Pilot Assembly is a critical combustion component engineered for high-recovery gas water heaters and commercial boilers. As a direct factory replacement for the discontinued PLT1043, this assembly ensures precise ignition and flame rectification within the combustion chamber. Designed to maintain the pilot flame required to bridge the main burner orifice, this OEM water heater part integrates a high-durability pilot burner, thermocouple sensing element, and heavy-duty tubing to withstand extreme thermal cycling. In the field, technicians rely on the 100165823 for its exact fit in Lochinvar Copper-Fin and A.O. Smith commercial series, preventing common "no-heat" calls caused by carbon buildup or sensor fatigue. By utilizing genuine burner ignition components, you maintain the ANSI Z21.10.3 safety standards and factory-specified thermal efficiency of the appliance. This pilot burner replacement is vital for contractors looking to restore reliable gas-fired boiler ignition and prevent nuisance lockouts in high-demand hydronic and potable water systems.

• Direct PLT1043 Replacement: Ensures 100% mechanical and electrical compatibility with legacy Lochinvar systems.
• Reliable Flame Sensing: The integrated thermocouple provides stable millivolt output to the gas valve, preventing unexpected shutdowns.
• Optimized Ignition: Precision-milled pilot orifice resists clogging, maintaining a consistent flame pattern for the main burner.
• Rugged Construction: Built with high-grade alloys to resist oxidation and heat-related deformation in heavy-duty commercial applications.

• How do I confirm if the 100165823 fits my specific boiler? Check the rating plate for "PLT1043" or cross-reference the 100165823 SKU with your serial number. This part is standard in many Copper-Fin and early-model commercial water heaters.
• Why is my pilot light failing to stay lit after installation? Ensure the thermocouple nut is hand-tight plus a 1/4 turn into the gas valve and verify the pilot tubing has no kinks that could restrict natural gas or LP flow.
• Is this assembly compatible with both Natural Gas and Propane units? While the pilot body is often universal, you must verify the orifice size matches the fuel type specified on the appliance's manifold.

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.