Watts 100XL-4-150 Temperature and Pressure Relief Valve

The Watts 100XL-4-150 Temperature and Pressure Relief Valve provides essential safety for water heaters and hot water storage tanks. This self-closing, lever-operated relief valve features a brass body and a stainless steel spring for lasting reliability. With a 3/4 inch inlet and 3/4 inch outlet and a male x female threaded end connection, it installs easily on standard plumbing.

Designed to handle demanding hot-water applications, it is rated for temperatures up to 210°F and a set pressure range of 75–150 PSI, plus a steam rating of 105,000 BTU/hour. The valve complies with key safety standards, including ANSI Z21.22, ASME, and CSA, ensuring dependable performance and compliance.

The unique thermostat with a special thermo-bonded coating enhances durability and response, making this valve a reliable choice for both residential and commercial water heaters.

• Self-closing, full automatic operation
• Test lever for easy manual verification
• Brass body with stainless steel spring
• End connection: male threaded x female threaded
• 3/4" inlet and 3/4" outlet connections
• Set pressure range: 75–150 PSI; Temperature rating: 210°F
• Temperature steam rating: 105,000 BTU/hour
• Applicable standards: ANSI Z21.22, ASME, CSA