Lochinvar & A.O. Smith 100109259 Valve

As an HVAC industry standard, the Lochinvar & A.O. Smith 100109259 Valve is a critical safety component designed for high-performance water heating systems. This 3/4" T&P Valve is engineered to protect residential and commercial boilers by managing both thermal expansion and internal pressure. With a factory-set 150 PSI pressure relief and a 210°F temperature relief threshold, this valve ensures fail-safe operation when system variables exceed safe limits. The 1.5" cavity design and 3/4" male NPT inlet provide a robust connection for standard tank tappings, maintaining the structural integrity of the water heater. Utilizing a corrosion-resistant brass body and stainless steel internals, this ASME Section IV certified valve provides long-term reliability for professional contractors performing routine maintenance or emergency replacements. When your jobsite requires OEM Lochinvar replacement parts, this temperature and pressure relief valve delivers the exact specifications needed for multi-brand compatibility across A.O. Smith and Lochinvar boilers.

Key Benefits:

• Dual-Protection Safety: Provides simultaneous protection against excessive pressure and high-temperature conditions to prevent tank failure.
• Professional Grade Durability: Features a robust brass body with a high-heat rated thermoplastic shank and silicone seat for extended service life.
• Precise Actuation: Calibrated for 150 PSI and 210°F to meet strict safety codes and residential plumbing standards.
• Code Compliance: ASME Section IV and CSA listed for use in commercial and residential pressurized heating applications.
• Contractor Ready: Standard 3/4" NPT threading allows for rapid installation on common hot water storage tanks and boilers.

Common Questions:

What is the relief rating of the 100109259 valve?
This valve is factory-set to discharge at a pressure of 150 PSI or a temperature of 210°F, ensuring it handles the most common safety requirements for standard water heaters.

Is this part compatible with non-Lochinvar units?
Yes, while it is an OEM 100109259 part, it is widely utilized across A.O. Smith, State, and American water heater brands that require a 3/4" connection and 150/210 rating.

How do I know if this T&P valve needs replacement?
If the 3/4" T&P relief valve is constantly dripping or has scale buildup around the discharge port, the seal or spring may be compromised, necessitating an immediate swap to maintain system safety.

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.