Lochinvar & A.O. Smith 100108279 Valve

As a direct replacement for 100108278, the Lochinvar & A.O. Smith 100108279 Valve is a critical safety component designed for commercial and residential water heating systems. This 3/4" temperature and pressure relief valve (T&P) is factory-calibrated to discharge at a 150 PSI pressure setting or a 210°F temperature threshold, preventing catastrophic tank failure. Engineered with a durable brass body and a thermo-bonded coated sensing element, it ensures accurate thermal response and resistance to mineral buildup. The 100108279 OEM valve typically features a 3/4" MNPT inlet and 3/4" FNPT outlet, making it compatible with a wide range of Lochinvar boilers and A.O. Smith storage tanks. For high-demand HVACR applications, this ASME-rated safety valve provides the necessary over-pressure protection required by modern plumbing codes. When replacing old units, verify the shank length and BTU rating to ensure full system compatibility during field installation.

Key Benefits:

• OEM Compatibility: Serves as the official replacement for 100108278 and 9000071015, ensuring a precise fit in A.O. Smith and Lochinvar units.
• High-Temperature Protection: Specifically designed to trigger at 210°F (99°C) to prevent steam explosions and overheating.
• Corrosion Resistance: Features a robust brass construction and high-quality internals to withstand harsh water conditions.
• Code Compliance: Meets ASME Section IV and ANSI Z21.22/CSA 4.4 standards for reliable safety performance in pressurized systems.
• Streamlined Installation: Compact design with a standard 3/4-inch NPT connection simplifies the swap-out process for service contractors.

Common Questions:

Which models are compatible with the 100108279 T&P valve?
This valve is the direct successor to part 100108278 and fits various A.O. Smith residential gas/electric heaters and Lochinvar high-efficiency boilers. Always match the BTU discharge capacity of the valve to your heater's input rating.

Can I use this valve for a direct vent water heater?
While this residential orientation valve fits most standard gas and electric models, certain direct vent or high-capacity commercial units may require specific probe lengths. Consult the original equipment manual to confirm the specific shank length requirements.

When should a T&P relief valve be replaced?
Technicians recommend inspection if the safety valve is leaking, shows signs of heavy liming, or if the system is frequently cycling near the 150 PSI limit. A malfunctioning valve can lead to dangerous pressure buildup.

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.