Watts 0121346 Valve

The Watts 0121346 (Model 100XL-8-125) is a high-capacity T&P relief valve designed for domestic hot water storage tanks and water heaters. This 3/4-inch unit features an extended thermostat (8-inch probe) to ensure accurate thermal sensing in deep-insulated tanks. With a 125 PSI pressure setting and a 100,000 BTU/hr CSA temperature steam rating, it provides critical over-pressure and over-temperature protection. This specific model is the lead-free updated replacement for the discontinued 0066109, meeting all current potable water safety standards. The construction utilizes a bronze body with a non-metallic coating on the thermostat to resist mineral buildup and galvanic corrosion, ensuring reliable seating during emergency discharge cycles.

Key Benefits

• Extended 8-inch thermostat probe provides precise temperature monitoring in heavily insulated water heaters.
• Certified lead-free bronze body construction ensures compliance with national low-lead regulations for potable water systems.
• Includes a fixed 210°F temperature relief setting and a 125 PSI pressure relief capacity for system safety.
• Provides a high discharge capacity of 100,000 BTU/hr for residential and light commercial applications.
• Standard 3/4" NPT male inlet and 3/4" NPT female outlet for easy integration into existing plumbing manifolds.

Common Questions

Can the Watts 0121346 replace the 0066109 model?
Yes, the 0121346 is the direct lead-free replacement for the older 0066109 model, maintaining the same physical dimensions and pressure specifications.

What is the purpose of the 8-inch probe length?
The extended 8-inch T&P valve probe is required when the tank insulation is thick, or the fitting is recessed, ensuring the element reaches the hottest water at the top of the tank.

Is this valve suitable for high-pressure commercial systems?
This specific model is rated for 125 PSI; always verify your system’s maximum working pressure requirements before installation.

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.