Lochinvar & A.O. Smith 100110880 Valve

The Lochinvar & A.O. Smith 100110880 Valve is a professional-grade 1" T&P relief valve engineered for high-capacity water heater temperature and pressure protection. Designed with a 150 PSI pressure rating and a 210°F temperature relief threshold, this valve serves as a critical safety component in both commercial and heavy-duty residential applications. The 3" probe extension ensures accurate internal tank sensing, making it an ideal A.O. Smith replacement part for systems requiring precise thermal monitoring. Built to ASME and AGA standards, this 100110880 relief valve handles up to 2,155,000 BTU/hr, offering robust performance where standard 3/4" valves fall short. Its 1-inch NPT connections provide the necessary flow rate to prevent tank over-pressurization and thermal runaway, maintaining system integrity in demanding HVACR environments. For contractors handling Lochinvar boiler maintenance or large-scale water heating repairs, this OEM-spec component is the standard for long-term reliability and compliance.

• High-Capacity Discharge: Supports systems up to 2,155,000 BTU/hr, ensuring rapid pressure relief during critical spikes.
• Precision Thermal Sensing: Integrated 3-inch extension probe provides accurate temperature readings from the core of the water column.
• Rugged Construction: Corrosion-resistant internal components designed to withstand 210°F maximum temperature settings without premature fatigue.
• Direct OEM Compatibility: Verified fit for specific A.O. Smith and Lochinvar models, including those requiring part number 9006081005.

When should a T&P relief valve be replaced?
Technicians should replace the valve if it shows signs of "weeping," mineral buildup on the discharge port, or if it fails to reseat during annual diagnostic testing. Persistent dripping often indicates excessive thermal expansion or a compromised internal seal.

Is the 3" extension mandatory for all tanks?
The 3-inch extension probe is specifically required for tanks with thicker insulation or specific internal baffle designs where a standard short-shank valve cannot reach the optimal sensing zone within the top six inches of the water heater.

What causes a relief valve to pop frequently?
Frequent activation is usually caused by a failed thermal expansion tank, high incoming water pressure exceeding 80 PSI, or a malfunctioning thermostat. If the 150# T&P valve is lifting, the system's static pressure or temperature must be verified immediately.

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.