Watts 0556018 Valve

The Watts 0556018 is a heavy-duty LFN240X-6 automatic reseating temperature and pressure relief valve designed for high-capacity protection in commercial water heating systems. As the lead-free replacement for the discontinued Watts 0315120, this 1-inch FNPT valve provides essential emergency protection against excessive thermal and pressure buildup. Its lead-free copper silicon alloy body ensures compliance with safe drinking water standards while maintaining structural integrity under rigorous mechanical stress. Equipped with a 6-inch stainless steel extension thermostat, the valve delivers precise temperature sensing directly within the hot water storage tank.

Engineered to handle a steam discharge capacity of up to 3,438,000 BTU/hr at its factory-set pressure of 125 psi, the 0556018 is built for large-scale boiler and heater applications. The temperature relief is fixed at 210°F (99°C), featuring a non-mechanical seat-to-disc alignment that facilitates reliable automatic reseating after each discharge. For contractors managing modern facilities, this commercial T&P relief valve includes a built-in flood sensor with SentryPlus Alert technology (requires separate activation kit) to detect and communicate discharge events to building management systems. Its durable construction includes tamper-resistant bonnet screws and a thermo-bonded coated thermostat to prevent mineral buildup and maintain long-term performance.

Key Benefits

• Lead-Free Reliability: Replaces the old 0315120 model with a lead-free copper silicon alloy body that meets all current codes for potable water systems.
• High Steam Capacity: Rated for up to 3,438,000 BTU/hr, providing critical safety for large commercial hot water tanks.
• Precision Thermal Sensing: Features a 6-inch stainless steel thermostat to ensure accurate 210°F relief activation.
• Smart Monitoring Readiness: Integrated flood sensor allows for remote monitoring of relief events when integrated with a BAS or cellular gateway.
• Simplified Installation: Standard 1-inch FNPT inlet and outlet connections offer direct compatibility with existing commercial plumbing headers.

Common Questions

Is the Watts 0556018 a direct replacement for the 0315120?
Yes, the 0556018 is the designated lead-free replacement for the legacy 0315120 model. It maintains the same 1-inch sizing and 125 psi pressure setting while upgrading the material to current lead-free standards.

What is the steam discharge rating for this specific valve?
This valve is rated at 3,438,000 BTU/hr at its factory setting. It is critical to ensure the heater’s BTU input does not exceed this rating for proper system protection.

Does this valve include the activation kit for the flood sensor?
No, the 0556018 includes the SentryPlus Alert flood sensor, but the connection kit required to relay alerts to a Building Management System (BMS) or Wi-Fi network is sold separately.

This item is not eligible for free shipping.

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.