Watts 0121589 Valve

The Watts 0121589 is a high-capacity 1" T&P relief valve designed specifically for heavy-duty commercial hot water supply tanks and heaters. Part of the Watts LFN240 series, this model is the lead-free iteration of the N240X-9-150, providing automatic temperature and pressure protection for systems with high BTU inputs. It features a 1-inch NPT female inlet and outlet, with a factory pressure relief setting of 150 psi and a temperature relief point of 210°F. The 9-inch stainless steel thermostat probe ensures accurate sensing deep within the tank tappings to prevent overheating and potential vessel failure. This valve is built with a lead-free copper silicon alloy body and includes a non-mechanical seat-to-disc alignment for reliable reseating after discharge. It serves as a direct replacement for Watts LFN240X-9-150-1 and N240X-9-150, meeting all ASME Section IV and ANSI Z21.22 requirements for large-scale domestic water heating installations.

• Lead-Free Construction: The copper silicon alloy body complies with all lead-free installation regulations for potable water.
• High Discharge Capacity: Certified for systems requiring up to 4,059,000 BTU/hr thermal relief, making it suitable for large commercial boilers.
• Automatic Reseating: Features a 2-in-1 design that automatically resets after relieving pressure or temperature, reducing system downtime.
• Probe Durability: The 9-inch thermostat is constructed with a thermo-bonded coating to resist mineral buildup and corrosion.
• Tamper Resistance: Equipped with tamper-resistant bonnet screws to prevent unauthorized field adjustments to the set point.

What systems are compatible with the Watts LFN240X-9?
This valve is engineered for commercial hot water storage tanks and heaters. It is a direct technical match for models listed as 0121589, LFN240X-9-150-1, and the older bronze N240X-9-150.

How do I activate the flood sensor feature on this valve?
While the valve includes a discharge line flood sensor, activation requires a separate SentryPlus Alert connection kit to integrate with building management systems or cellular gateways.

Is this valve suitable for steam applications?
No, the LFN240 series is specifically for hot water supply tanks. For steam-specific relief, a dedicated steam safety valve must be selected based on boiler horsepower and pressure requirements.

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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.