Watts 0121406 Valve

The Watts 0121406 (Model 40L-3-150) is a high-capacity automatic temperature and pressure relief valve designed specifically for large-scale water heating systems and storage tanks. Featuring a 3/4 inch NPT male inlet and NPT female outlet, this Series 40L valve is engineered with a bronze body and a 3-inch extended thermostat reach to ensure accurate sensing in high-volume applications. It provides critical protection with a pressure relief setting of 150 psi and a temperature set point of 210°F. With a verified CSA and ASME rating, it delivers a massive steam discharge capacity of 1,437,600 BTU/hr, making it the standard choice for commercial water heater relief valves where high-output thermal expansion protection is required. The non-mechanical, all-bronze internal construction ensures reliable reseating and long-term durability in demanding mechanical rooms.

• Maximum Discharge Capacity: Rated at 1,437,600 BTU/hr for high-demand commercial hot water systems.
• Extended Thermostat: Features a 3-inch probe to reach deeper into the tank for precise thermal monitoring.
• ASME Section IV Certified: Meets strict safety codes for pressure vessel protection and HVACR compliance.
• Dual-Protection Logic: Provides simultaneous temperature and pressure relief to prevent tank failure or steam explosions.
• Rugged Construction: Built with a lead-free bronze body and stainless steel springs to resist scale and corrosion.

Common Questions

What is the BTU rating for the Watts 40L-3-150?
This specific T&P valve is rated for a steam relief capacity of 1,437,600 BTU/hr at 150 psi, which must exceed the heating input of your water heater for code compliance.

What is the difference between a standard T&P and an extended probe valve?
The Watts 0121406 features an extended 3-inch thermostat probe, which is required for specific tank insulation thicknesses to ensure the sensing element remains in the top 6 inches of the water column.

Is the Watts 0121406 suitable for potable water systems?
Yes, this valve is designed for commercial hot water supply tanks and meets the necessary material standards for potable water applications.

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.