Menu
Cart 0
Watts F121602 Valve

Watts F121602 Valve

Watts

The Watts F121602 LF340-3 Temperature and Pressure Relief Valve is a 1-1/2-inch lead-free T&P relief valve designed to protect commercial hot water storage tanks and water heaters against excessive temperature and pressure.

This automatic reseating safety valve features a 150 PSI pressure relief setting, 210°F temperature relief setting, and 3-inch stainless steel thermostat probe for direct installation in compatible tank tappings.

The Watts F121602 commercial water heater relief valve features a lead-free copper silicon alloy body, 1-1/2-inch NPTF female inlet and outlet connections, tamper-resistant bonnet screws, and non-mechanical seat-to-disc alignment. Its automatic reseating design helps restore valve closure after relief conditions have subsided.

This Watts LF340 series safety relief valve also includes a SentryPlus Alert discharge line flood sensor for detecting excessive relief-valve discharge. Sensor activation requires a separately purchased connection kit.

Verify tank pressure ratings, heating capacity, thermostat probe clearance, connection dimensions, and applicable plumbing codes before installation.

Key Benefits

  • Manufacturer: Watts.

  • Part Number: F121602.

  • Model: LF340-3 150/210 FS.

  • Product Series: LF340.

  • Product Type: Automatic reseating temperature and pressure relief valve.

  • Nominal Valve Size: 1-1/2 inches.

  • Pressure Relief Setting: 150 PSI.

  • Temperature Relief Setting: 210°F (approximately 99°C).

  • Maximum Working Pressure: 112 PSI, as listed in manufacturer specifications.

  • Thermostat Probe Length: 3 inches.

  • Thermostat Material: Stainless steel.

  • Body Material: Lead-free copper silicon alloy.

  • Inlet Connection: 1-1/2-inch female NPTF.

  • Outlet Connection: 1-1/2-inch female NPTF.

  • Valve Operation: Automatic reseating temperature and pressure protection.

  • Seat Alignment: Non-mechanical seat-to-disc alignment.

  • Bonnet Construction: Tamper-resistant bonnet screws.

  • Flood Detection: Includes SentryPlus Alert discharge line flood sensor.

  • Sensor Activation: Requires a separately purchased connection kit.

  • Building Management Integration: Compatible connection options support discharge monitoring through approved monitoring systems.

  • Lead-Free Construction: Yes.

  • CSA Temperature Rating: 1,150,000 BTU/hr.

  • ASME Pressure Steam Rating: 6,379,000 BTU/hr at the 150 PSI relief setting.

  • UPC: 098268559453.

  • Application: Commercial hot water storage tanks and water heaters.

  • Replacement Reference: Replaces Watts 0121602 in manufacturer-listed applications.

  • Installation: Verify system design, relief capacity, probe clearance, discharge piping, and applicable code requirements.

Common Questions

Q: What is the Watts F121602 temperature and pressure relief valve used for?

A: The Watts F121602 LF340-3 protects compatible commercial hot water tanks and water heaters from excessive pressure and temperature. It opens at its specified 150 PSI pressure setting or 210°F temperature setting to relieve unsafe conditions and is designed to reseat automatically when appropriate operating conditions are restored.

Q: What are the connection sizes and probe length of the Watts F121602?

A: The valve features 1-1/2-inch female NPTF inlet and outlet connections and a 3-inch stainless steel thermostat probe.

The probe must be properly positioned in the water heater or storage tank according to the manufacturer's installation instructions. Confirm the tank tapping dimensions and required relief capacity before installation.

Q: Does the Watts F121602 include a flood sensor, and can it replace the Watts 0121602?

A: Yes. The Watts F121602 includes a SentryPlus Alert discharge line flood sensor, but a separate activation kit is required for monitoring functionality.

Watts identifies this model as a replacement for the discontinued 0121602. Verify the original valve's pressure setting, temperature setting, connection configuration, probe length, and system requirements before replacement.

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.

F121602 is the cross for 0121602