Watts 0121327 Relief Valve

The Watts 0121327 (Model LF3L-100) is a high-performance 3/4 inch pressure relief valve designed specifically for emergency protection against over-pressure conditions in water heaters and storage tanks. Featuring a Lead Free copper silicon alloy body, this valve ensures compliance with low-lead regulations while providing a durable solution for residential and light commercial applications. It is engineered with a pressure relief setting of 100 psi and serves as the direct, updated replacement for legacy models 0011090, 3L-100, and LF3L-100-3/4. The diaphragm-operated design minimizes the risk of seat leakage, while the stainless steel spring maintains consistent set-point accuracy. This ASME rated relief valve provides a high BTU discharge capacity, crucial for system safety during thermal expansion or thermostat failure. Contractors favor the NPT threaded inlet and outlet for standard piping integration and reliable mechanical sealing in pressurized hydro systems.

• Direct Replacement: Seamlessly replaces discontinued models 0121327 and 0011090 with the updated Lead Free standard.
• Lead Free Construction: Compliance with federal mandates ensures suitability for all potable water systems.
• Calibrated Protection: Precision-set at 100 psi relief pressure to prevent tank rupture or system fatigue.
• All-Bronze Body: Heavy-duty copper silicon alloy resists corrosion and mineral buildup in harsh water conditions.
• High Capacity Discharge: Engineered to meet standard BTU ratings for domestic hot water thermal protection.

Is the Watts 0121327 compatible with older 3L-100 installations?
Yes, the 0121327 is the official updated version of the 3L-100 series, maintaining the same 3/4" NPT footprint for easy field swaps.

Can this valve be used for temperature relief?
This specific model is a pressure-only relief valve set at 100 psi. Always verify if your local code requires a combination Temperature and Pressure (T&P) valve for your specific water heater application.

What is the orientation for installing the LF3L-100?
For optimal performance, the valve should be installed upright on the cold water inlet or hot water outlet of the tank, ensuring the discharge line is piped to a safe location according to local plumbing codes.

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.