Lochinvar & A.O. Smith 100346615 Gas Valve

The Lochinvar & A.O. Smith 100346615 Gas Valve is an essential OEM replacement component engineered for high-efficiency natural gas-fired heating systems. This Natural Gas Water Heater Control Valve features an integrated microprocessor for precise temperature regulation and advanced diagnostics. Optimized for Ultra-Low NOx (ULN) applications, it specifically fits units with a 2-inch insulation cavity, replacing legacy part numbers including 100093971 and Honeywell WV8860B1318. As a self-powered control, it utilizes a thermopile-powered gas valve design, drawing millivoltage directly from the pilot flame to eliminate the need for an external power source.

Built for durability and technical precision, the 100346615 includes a 1/2" NPT inlet and a 1/2" inverted flare outlet with a right-angle body pattern. It is preset for a 5.0" W.C. outlet pressure, ensuring proper stoichiometric ratios for clean combustion. The internal NTC temperature sensor provides real-time monitoring through an immersion well, offering accurate thermal feedback and critical high-limit protection via the integrated Temperature Cut-Out (TCO) function. For service technicians, the front-facing LED status indicator simplifies troubleshooting by providing rapid flash codes to identify system faults without complex teardowns.

Key Benefits for Technicians

• Direct OEM Compatibility: Engineered as a drop-in replacement for specific Lochinvar and A.O. Smith ULN water heaters, ensuring a perfect fit for 2-inch cavity models.
• Advanced Diagnostics: The integrated LED status indicator allows for immediate field troubleshooting, reducing downtime during service calls.
• Self-Powered Reliability: Utilizes a standing pilot and thermopile configuration, maintaining operation during power outages and simplifying wiring.
• Precise Thermal Control: Features an internal microprocessor and NTC thermistor for tight temperature tolerances and consistent hot water delivery.
• Enhanced Safety: Includes a factory-set Temperature Cut-Out (TCO) and failsafe mechanisms to prevent overheating and ensure safe gas flow.

Common Questions

Is the 100346615 valve compatible with LP (Propane) systems?
No, this specific model is calibrated exclusively for Natural Gas applications. Converting this valve for use with Liquid Propane is not supported and can lead to equipment failure.

What does the flashing LED on the front of the valve signify?
The LED provides diagnostic flash codes. A single flash typically indicates normal operation, while specific sequences can diagnose issues such as thermopile voltage drops, sensor faults, or high-temperature limits.

Can I use this to replace a 100093971 valve?
Yes, the 100346615 is the official direct replacement for the discontinued 100093971 gas valve, maintaining the same form factor and technical specifications.

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.