Lochinvar & A.O. Smith 100108729 Pilot

The Lochinvar & A.O. Smith 100108729 Pilot is a precision-engineered LP pilot assembly (model PB-5S) designed specifically for liquid propane fired water heaters and boilers. As a genuine OEM replacement part, it ensures direct compatibility with A.O. Smith GCV, XCV, and Lochinvar residential units where a stable pilot flame is critical for safe ignition. This pilot burner assembly includes the requisite orifice calibrated for LP gas pressure, a high-grade thermocouple for reliable flame sensing, and spark igniter leads to interface with your existing ignition module or gas valve.

For service technicians, the 100108729 replaces old or sooted assemblies that cause flame failure lockouts or intermittent ignition issues. The PB-5S pilot features a robust bracket design for easy mounting within the burner chamber, maintaining the precise pilot-to-main-burner alignment necessary for efficient combustion. When performing a water heater pilot replacement, utilizing this factory-spec Lochinvar pilot assembly eliminates the risk of incorrect gas-to-air mixtures often found with universal kits, ensuring the unit meets original manufacturer performance standards.

• Genuine OEM Compatibility: Verified fit for A.O. Smith, State, and Lochinvar LP gas water heaters.
• Integrated Components: Includes the PB-5S pilot burner, thermocouple, and ignition wire for a complete swap-out.
• Optimized LP Orifice: Factory-sized for liquid propane to prevent lifting flames or carbon buildup.
• Enhanced Flame Signal: Precision thermocouple ensures the gas valve receives a consistent millivolt signal to stay open.
• Contractor Grade: Built to withstand the high-temperature environment of the combustion chamber for long-term HVACR reliability.

Will this work for Natural Gas units?
No, the 100108729 is strictly for LP (Propane) applications. Using this in a Natural Gas unit will result in improper combustion due to the orifice sizing.

What are the signs this pilot assembly needs replacement?
Common indicators include the pilot light not staying lit, a weak orange flame, or the system triggering an ignition failure code despite having a spark.

Does it include the mounting gasket?
This pilot assembly typically includes the mounting bracket; however, it is standard practice to inspect the burner door gasket during installation and replace if the seal is compromised.

This item is not eligible for free shipping.

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.