Lochinvar & A.O. Smith 100109915 Gas Valve

The Lochinvar & A.O. Smith 100109915 Gas Valve is a critical direct replacement component designed for high-recovery commercial water heaters and boilers. This 24V LP step gas valve is engineered specifically for liquid propane applications, featuring a dual-stage regulation profile with a 2.5"/11" WC (water column) setting. As a slow-opening gas valve, it ensures a smooth ignition sequence, reducing manifold pressure spikes and preventing "hard starts" in high-input high-efficiency systems. With a 3/4-inch NPT inlet/outlet, this 100109915 model provides the flow capacity required for demanding thermal loads.

For field technicians, this OEM propane gas control is the drop-in solution for A.O. Smith BTRC-365 and BTRC-400 series units, as well as compatible Lochinvar BTC-120 through BTC-400 models. By maintaining precise manifold pressure regulation, it optimizes combustion efficiency and ensures the burner rail receives consistent fuel delivery regardless of fluctuating tank pressures. When replacing a failed solenoid or regulator assembly, this industrial-grade valve restores factory-spec heating system performance and safety protocols.

• OEM Compatibility: Engineered for precise fitment in Lochinvar and A.O. Smith commercial water heaters, eliminating field modification needs.
• Optimized Ignition: The slow-opening characteristic prevents burner resonance and ensures stable pilot-to-main flame transition.
• Precise Pressure Control: Pre-set for Liquid Propane (LP) with a step-down regulator maintaining 11" WC for consistent BTuh output.
• Robust Construction: Designed for high-cycle commercial environments requiring 24VAC control circuits.

• Can this 100109915 valve be used for Natural Gas? No, this is a dedicated LP gas valve set for 11" WC; using it for Natural Gas will cause dangerous over-firing and equipment damage.
• What are the connection sizes? This unit features standard 3/4" NPT threads to handle high-volume gas flow for commercial-sized burners.
• Is the 24V coil compatible with millivolt systems? No, this valve requires a 24V transformer and is not compatible with standing pilot millivolt controllers.

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.