Lochinvar & A.O. Smith 100109891 Gas Valve

The Lochinvar & A.O. Smith 100109891 Gas Valve is a critical OEM replacement part designed for high-recovery commercial water heaters and boilers. Engineered for precision, this 24V natural gas valve operates with a 3.5" WC manifold pressure to ensure stable combustion and optimal thermal efficiency. Built with a rugged 3/4" NPT connection, it is a direct substitute for legacy part numbers such as 9004497205 and 192015, providing a reliable solution for technicians servicing A.O. Smith Cyclone and Lochinvar Armor series equipment. As a non-universal component, it maintains the strict safety parameters required for commercial gas water heater repair, regulating fuel flow with high-duty cycle solenoid coils that withstand the demands of constant industrial operation. Whether you are performing routine HVAC preventative maintenance or an emergency gas control valve replacement, utilizing this genuine factory part ensures exact fitment and keeps the appliance within original manufacturer performance specifications.

• Precise Pressure Regulation: Factory-set at 3.5" water column for consistent burner performance and reduced emissions.
• Broad Compatibility: Services multiple commercial heating systems, including Lochinvar and A.O. Smith high-efficiency models.
• Heavy-Duty Construction: Features a durable 3/4 inch inlet/outlet design capable of handling high-volume gas throughput in mechanical rooms.
• System Integration: Optimized for 24-volt control circuits, ensuring seamless communication with ignition modules and limits.

Is the 100109891 valve compatible with Propane (LP) systems?
No, this specific model is calibrated strictly for Natural Gas (NG). Converting this valve for LP use is not recommended; always use the manufacturer-specified LP alternative for safety.

Which water heater models use this specific gas valve?
This HVAC replacement part is typically found in A.O. Smith Cyclone (BTH) and Lochinvar Armor (AW) units. Verify your specific model and serial number to ensure a correct OEM part match.

What are the symptoms of a failing 100109891 gas valve?
Common indicators include inconsistent pilot ignition, "soft lockout" codes on the controller, or the main burner failing to sustain a flame despite a proper call for heat from the 24V circuit.

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.