Watts 0156736 Valve

The Watts 0156736 Valve (Series 100XL) is a critical temperature and pressure relief valve designed to provide automatic safety protection for commercial and residential hot water supply tanks. Featuring a robust bronze body construction and 3/4 inch NPT connections, this T&P relief valve is engineered to withstand demanding plumbing environments while preventing catastrophic tank failure. The unit utilizes a unique thermo-bonded coating on its thermostat probe for exceptional accuracy and longevity, ensuring it activates reliably at 210°F or 150 psi. As a veteran-preferred water heater safety valve, it is ASME rated and CSA listed, meeting strict ANSI Z21.22 standards for emergency relief. Its 4-inch extension thermostat and stainless steel spring ensure consistent reseating and performance in water heaters with capacities up to 105,000 BTU/hr. When performing replacements, contractors rely on this Watts safety valve for its non-mechanical seat-to-disc alignment and durable manual test lever.

Key Benefits

• High-Temperature Protection: Automatically discharges water to prevent overheating when temperatures reach 210°F (99°C).
• Over-Pressure Mitigation: Rated for a maximum relief setting of 150 psi to protect vessel integrity during thermal expansion.
• Superior Materials: Features a corrosion-resistant bronze body and a stainless steel spring for extended service life in harsh water conditions.
• Industry Compliance: Fully compliant with ASME Section IV requirements and CSA certified for professional installations.
• Accurate Sensing: Specialized thermo-bonded probe coating resists mineral buildup, ensuring precise thermal response.

Common Questions

• Is this valve suitable for high-capacity commercial heaters? This specific model is rated for water heaters up to 105,000 BTU/hr. For larger BTU requirements, consult the Watts series specification sheets for higher capacity relief options.
• What is the purpose of the 4-inch extension? The extended thermostat probe is designed for tanks with thicker insulation, ensuring the sensing thermal element is positioned correctly within the hot water outlet for accurate monitoring.
• Why is my T&P valve dripping? Persistent dripping often indicates thermal expansion issues within the system or a build-up of sediment on the valve seat. For safety, the valve should be manually tested via the lever or replaced if it fails to reseat properly.

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.