Watts 0121449 Valve

The Watts 0121449 is a high-performance 140S-3-3/4" 150# automatic reseating temperature and pressure relief valve, engineered specifically for commercial water heater protection. As a veteran in the field, you know that domestic hot water supply tanks require precise thermal and overpressure mitigation. This unit features a robust bronze body construction with 3/4-inch NPT female inlet and outlet connections. The integrated 3-inch thermostat utilizes a specialized thermo-bonded coating to prevent mineral buildup and ensure accurate sensing. With a pressure relief setting of 150 psi and a temperature relief setting of 210°F, this valve provides critical protection against catastrophic tank failure. It is functionally identical to the 140S-3-3/4-150 and LF140S3-150-3/4 models, offering seamless HVACR valve compatibility for replacement or new installation on high-demand storage tanks.

• Automatic Reseating: Features an automatic reseating temperature and pressure relief mechanism that eliminates the need for manual resets after nuisance trips.
• Corrosion Resistance: The bronze body construction and coated thermostat provide superior durability in harsh water environments.
• Safety Monitoring: Equipped with tamper-resistant bonnet screws and a high-strength test lever for routine maintenance checks.
• Direct Installation: The 3-inch short thermostat design is specifically built for direct installation into available tank tappings, ensuring rapid thermal response.

Is this valve compatible with lead-free requirements?
The 140S series is designed for commercial use; installers should verify local jurisdictional codes regarding lead content transitions if the application involves potable water systems requiring NSF/ANSI 372 compliance.

Can this be used on gas or electric heaters?
Yes, the Watts 0121449 is universal for commercial hot water heaters regardless of the fuel source, provided the tank's BTU input does not exceed the valve’s AGA/ASME discharge rating.

What is the purpose of the 3-inch thermostat?
The 3-inch probe length is optimized for direct sensing within the top 6 inches of the tank where the hottest water resides, meeting ASME Section IV safety standards.

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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.