Lochinvar & A.O. Smith 100172018 Gas Valve

The Lochinvar & A.O. Smith 100172018 Gas Valve is a critical OEM replacement component designed for high-efficiency natural gas heating systems. This 24V gas valve is engineered to maintain a precise manifold pressure of 1.8" WC, ensuring optimal combustion stability and fuel-to-air ratios in compatible Lochinvar boilers and water heaters. Featuring a 3/4" gas valve inlet/outlet configuration, it provides the necessary flow capacity for mid-to-high BTU applications. This assembly is a direct, drop-in replacement for the obsolete VAL3405 and is commonly found in Lochinvar Copper-Fin models such as the CBN0497, CBN0647, and CBN0747 series. For technicians performing HVAC gas valve troubleshooting, verifying the 24VAC signal from the integrated control board is essential before installation. This boiler gas valve regulates fuel delivery with an internal solenoid, protecting the system from irregular pressure spikes and ensuring safe ignition sequences across many A.O. Smith natural gas valve applications.

• Direct OEM Interchange: Standardized fitment for existing VAL3405 installations with no manifold modifications required.
• Precise Pressure Regulation: Factory-set at 1.8" WC for consistent natural gas delivery and burner efficiency.
• Industrial-Grade Casting: Robust 3/4" NPT housing designed to withstand the thermal stress of continuous-duty commercial and residential boilers.
• System Compatibility: Verified for use with Lochinvar CBN0497, CBN0647, CBN0747, and CBN0747-M13 heating units.

• Can I use this valve for Propane (LP) applications? No, this specific model is calibrated for natural gas at 1.8" WC. Using it for LP without a manufacturer-approved conversion kit is hazardous.
• Does it include the internal solenoid? Yes, this is a complete 24V gas valve assembly featuring an internal microprocessor for fast response and precise flow control.
• How do I check if the valve is failing? If you have 24V at the terminals but the valve doesn't click open, or if you measure 0" WC at the outlet port despite having inlet pressure, the internal coil or seat has likely failed.

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.