Watts F121605 Valve

The Watts F121605 (LF340X-8-150) is a high-capacity Temperature and Pressure Relief Valve designed specifically for large-scale commercial water heaters and storage tanks. Featuring a 1-1/2 inch male inlet and female outlet, this lead-free relief valve provides critical overpressure protection with a set pressure of 150 PSI and a maximum temperature rating of 210°F. Engineered with an ASME Section IV rating, the F121605 delivers a high-flow discharge capacity of 6,379,000 BTU/hr, ensuring safety in demanding hydronic systems. As the direct replacement for the legacy Watts 0121605, it maintains the same installation footprint while utilizing a silicone disc for high-heat resistance and a reinforced coating to prevent mineral buildup on the seat. For technicians managing commercial boiler relief valve replacements, this unit ensures compliance with local plumbing codes while protecting against thermal expansion and pressure spikes in potable water applications.

• Direct Compatibility: Seamless replacement for model 0121605, reducing downtime during field repairs.
• Lead-Free Construction: Complies with low-lead regulations for safe use in potable water systems.
• High Discharge Capacity: Rated at 6,379,000 BTU/hr to handle large-volume commercial water heating equipment.
• Durable Seating: Features a high-temperature silicone disc to ensure a tight seal and reliable reseating after operation.
• Standardized Sizing: 1-1/2" NPT connections facilitate standard piping integration in commercial mechanical rooms.

What is the difference between Watts F121605 and 0121605?
The F121605 is the updated, lead-free version of the 0121605. It maintains identical performance specifications and physical dimensions, making it a drop-in replacement.

Is this valve ASME rated?
Yes, this T&P valve is ASME rated and HVACR technicians typically use it for high-output water heaters and storage tanks requiring Section IV compliance.

Can this valve be installed horizontally?
Standard practice dictates that T&P valves should be installed with the sensing element immersed in the top 6 inches of the tank, following the manufacturer's orientation guidelines to ensure accurate temperature sensing.

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.