Lochinvar & A.O. Smith 100109909 Gas Control

The Lochinvar & A.O. Smith 100109909 Gas Control assembly is a critical OEM component engineered for high-recovery commercial water heaters and boilers requiring precise fuel regulation. This unit serves as the direct 9004521205 replacement gas valve, specifically designed for Generation 3 and 4 burners. As a combination control, it integrates a redundant solenoid valve with a high-capacity pressure regulator to maintain stable manifold pressure across varying inlet conditions. This gas control valve for Lochinvar ensures optimal combustion efficiency and ignition reliability in A.O. Smith water heater repair applications. Built to withstand high-demand cycles, the 100109909 gas valve features a standardized footprint for seamless mechanical fitment into the existing gas train. Technicians should verify burner generation compatibility and ensure proper orifice alignment during installation to maintain the UL/CSA listing integrity of the appliance. This OEM water heater gas control is the factory-authorized solution for restoring safe flame characteristics and thermal output in compatible power-vented or atmospheric units.

Key Benefits for Technicians:

• Direct OEM Specification: Ensures exact electrical impedance and mechanical clearance, eliminating the need for field modifications.
• Generation 3 & 4 Compatibility: Specifically calibrated for the airflow and combustion parameters of Gen 3 and 4 burner assemblies.
• Integrated Pressure Regulation: Maintains consistent manifold gas pressure to prevent delayed ignition or soot accumulation.
• Updated Revision: Supersedes part number 9004521205 with enhanced internal diaphragm durability for long-term service life.

Common Questions:

Is the 100109909 compatible with older burner generations?
This specific gas control is engineered for Generation 3 and 4 burners. Always check the nomenclature on the rating plate to ensure the burner series aligns with this valve's calibration.

Can this valve be used for both Natural Gas and Propane (LP) units?
This component is typically configured for specific fuel types. Verify the spring kit or factory settings to ensure it matches the Natural Gas or LP requirements of the job site.

Does this replace the 9004521205 directly?
Yes, the 100109909 is the official updated service part that replaces the legacy 9004521205 gas valve without requiring manifold reconfiguration.

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.