Description
The Watts F121601 is a 1-1/2″ LF340 series lead free automatic reseating temperature and pressure relief valve engineered for reliable protection of water heaters and hydronic heating systems. Rated at 125 psi and 210°F, this valve provides dual-function overpressure and overtemperature safety in a single, compact assembly. The lead free construction ensures compliance with current potable water regulations, making it suitable for both residential and light commercial installations.
The valve features an automatic reseating design that allows it to return to the closed position once safe operating conditions are restored, minimizing system downtime and reducing service calls. A 3″ stainless steel thermostat element provides accurate and durable temperature sensing, while the included discharge line flood sensor adds an extra layer of protection by detecting unwanted water discharge at the drain line — alerting building occupants or facility managers to potential system issues before they escalate.
Key Features
- Lead free (LF) construction — compliant with lead-free potable water requirements
- Automatic reseating operation — reseats after actuation without manual intervention
- Rated pressure: 125 psi
- Rated temperature: 210°F
- Inlet connection: 1-1/2″ NPT
- 3″ stainless steel thermostat element for accurate, corrosion-resistant temperature sensing
- Discharge line flood sensor included — detects water at the relief valve discharge line
- Dual temperature and pressure protection in a single valve assembly
Applications
- Residential and commercial water heaters
- Hydronic boilers and heating systems
- Hot water storage tanks
- Any pressurized hot water system requiring T&P overpressure protection
Why Choose the Watts LF340 Series
Watts is a globally recognized leader in flow control and water quality products. The LF340 series is purpose-built for safety-critical applications where both temperature and pressure must be continuously monitored. The included flood sensor transforms this valve into a smart safety solution, providing early warning of discharge events that could indicate system malfunction. Specifiers and installers trust the LF340 for its proven reliability, lead free compliance, and ease of installation.
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