Watts 0121453 Valve

The Watts 0121453 Valve is a lead-free, automatic reseating temperature and pressure relief valve designed specifically for commercial hot water supply tanks and heater applications. As the direct engineering successor to the Watts 0257564, this LF140X-5-150 model features a 3/4-inch FNPT inlet and outlet with a robust bronze body construction. Engineered for high-demand environments, it provides a 150 psi pressure relief setting and a 210°F temperature relief point, achieving an ASME steam discharge capacity of 1,438,000 BTU/hr. The 5-inch thermostat extension probe is treated with a specialized thermo-bonded coating to prevent mineral scale buildup, ensuring long-term reliability in varying water conditions. This hot water heater safety valve incorporates tamper-resistant bonnet screws and a reinforced test lever, allowing technicians to verify seat-to-disc alignment without compromising the factory calibration. For contractors performing retrofits or new installations, the Watts 140X series remains the industry standard for thermal expansion protection and over-pressure mitigation in potable water systems.

• High BTU Capacity: Rated at 1,438,000 BTU/hr to meet stringent ASME Section IV requirements for large commercial tanks.
• Lead-Free Bronze Construction: Fully compliant with potable water regulations, replacing the discontinued non-lead-free 140X-5-150 variants.
• Advanced Scale Resistance: The 5-inch probe utilizes a thermo-bonded coating to resist calcification, maintaining accurate temperature sensing.
• Automatic Reseating: Eliminates the need for manual resets after a relief event, reducing maintenance calls for commercial facilities.

• What is the difference between the 140S and 140X models? The 140X features an extension thermostat for installation in the hot water outlet piping, while the 140S is designed for direct tank tapping.
• Is the Watts 0121453 a direct replacement for 0257564? Yes, the 0121453 is the modern, lead-free "LF" equivalent for the older 0257564 and LF140X5-150-3/4 part numbers.
• Can this valve be used in steam heating systems? No, this is a T&P relief valve specifically rated for hot water supply tanks and heaters, not for steam boiler pressure relief.

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.