Watts 0315180 Relief Valve

The Watts 0315180 (Series N240X-9) is a heavy-duty, automatic reseating temperature and pressure relief valve designed for high-capacity protection of commercial water heaters and large-scale hot water supply tanks. Featuring a robust bronze body and a 1-inch NPT female inlet/outlet, this valve is engineered to manage extreme thermal and overpressure conditions. It provides a massive 4,059,000 BTU/hr steam discharge capacity at a 150 psi pressure relief setpoint, alongside a 210°F temperature relief setting. The 9-inch stainless steel extension thermostat ensures accurate thermal sensing deep within the tank for reliable performance. This model comes integrated with SentryPlus Alert technology, featuring a flood sensor on the discharge line to detect excessive water discharge before it leads to facility damage. When utilized with a compatible activation kit, it allows for proactive monitoring through building management systems, making it an essential component for critical plumbing and HVAC infrastructure where flood mitigation is a priority.

Key Benefits

• High BTU Capacity: Rated for 4,059,000 BTU/hr, providing maximum safety for high-output commercial water heating systems.
• SentryPlus Alert Technology: Built-in flood sensor helps prevent catastrophic water damage by detecting and signaling relief valve discharge.
• Durable Bronze Construction: Features a corrosion-resistant bronze body with tamper-resistant bonnet screws to ensure system integrity in demanding environments.
• Dual Protection: Combines reliable 150 psi pressure relief and 210°F temperature relief in a single, standard-sized 1-inch assembly.
• Automatic Reseating: Precision-engineered for non-mechanical seat-to-disc alignment, allowing the valve to close securely once pressure returns to safe levels.

Common Questions

Does this valve require an external kit for the flood sensor to work?
Yes, while the Watts N240X-9 includes the SentryPlus sensor hardware, you must purchase a separate activation kit (BMS or Cellular) to connect the sensor to your building management or notification network.

Can the 9-inch thermostat probe be cut or shortened for smaller tanks?
No, the stainless steel thermostat probe should never be modified. Doing so will compromise the temperature relief accuracy and safety of the temperature and pressure relief valve.

Is the 0315180 suitable for potable water systems?
This specific 0315180 model is compatible with hot water heaters and supply tanks; however, if your local code specifically mandates lead-free (LF) compliance for all potable water components, you should verify the technical specifications against local requirements before installation.

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.