Lochinvar & A.O. Smith 100108941 Valve

The Lochinvar & A.O. Smith 100108941 Valve is a natural gas control engineered for precision fuel regulation in high-efficiency commercial and residential heating systems. Designed for 3/4" x 3/4" FPT connections, this step-opening gas valve ensures controlled ignition and stable combustion by operating with a 0.7" WC step pressure before transitioning to a 4" WC full manifold pressure. As a critical HVAC replacement part, it is frequently utilized in Lochinvar Knight boilers and A.O. Smith water heaters to maintain proper air-gas mixture and optimal thermal efficiency. The integrated 24V solenoid provides reliable electronic actuation, while the robust internal regulator manages gas flow control to prevent erratic flame behavior. This OEM gas valve is built to high-performance standards, ensuring seamless compatibility with hot surface ignition and redundant safety systems found in demanding boiler maintenance environments.

• Step-Opening Technology: Features a 0.7" WC step for smooth light-offs, reducing ignition noise and mechanical stress on the burner.
• Precise Pressure Regulation: Maintains a steady 4" WC full pressure to optimize combustion and energy consumption.
• OEM Compatibility: Exact replacement for A.O. Smith 100108941 and equivalent Lochinvar part numbers, simplifying field installation.
• Standardized Fit: 3/4" NPT inlet and outlet ports allow for direct integration with existing gas lines in commercial boiler rooms.
• Reliable Flow Control: Specifically calibrated for natural gas applications to ensure consistent BTU output.

What are the symptoms of a failing Lochinvar gas valve?
Technicians often report flame failure or ignition faults (such as Error Code 11 on A.O. Smith units). If you have 24VAC at the gas control valve but the manifold pressure stays at zero, the internal solenoid has likely failed.

Can I use this 100108941 valve for propane (LP) conversions?
This specific model is factory-set for natural gas (NG) at 4" WC. For LP gas applications, a certified conversion kit or a specifically rated LP gas valve must be used to ensure safe manifold pressures.

Does this valve include the status indicator LED?
This is a high-capacity step-opening valve typically found in larger systems. While it integrates with the electronic control board for diagnostics, always check manifold pressure with a manometer to verify the 0.7" to 4" transition.

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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.