Watts 0556000 Valve

The Watts 0556000 (Model 100XL-3-150) is a critical 3/4" T&P relief valve designed to provide automatic temperature and pressure protection for water heaters and hot water storage tanks. Rated for systems up to 100,000 BTU/hr, this water heater safety valve utilizes a 2-in-1 design to prevent dangerous over-pressurization and thermal expansion. The Watts 100XL-3-150 is a direct replacement for 100XL-150-3/4 and 100XL-3-150-3/4 models, ensuring a precise fit for standard residential and light commercial plumbing applications.

Constructed with a durable bronze body and a stainless steel spring, this ASME rated relief valve is built for long-term reliability in harsh water conditions. It features a unique thermostat with a special thermo-bonded coating to ensure accurate thermal response at 210°F. The valve is CSA listed and meets ANSI Z21.22 standards. The 3-inch extension thermostat ensures the sensing element is correctly immersed in the top 6 inches of the tank, complying with strict plumbing codes. This unit is set for 150 PSI relief, guarding against structural tank failure and catastrophic pressure spikes.

• Dual-Protection Reliability: Combines temperature relief at 210°F and pressure relief at 150 PSI in a single unit.
• Advanced Thermostat Technology: Features a thermo-bonded coating for accurate sensing and resistance to mineral buildup.
• Contractor-Grade Construction: Corrosion-resistant bronze body with NPT male inlet and female outlet for straightforward installation.
• Industry Compliance: Fully ASME rated and CSA listed to meet local and national building codes.

Does this valve replace the L100XL series?
The 100XL-3-150 has a standard shank length. If your water heater has extra-thick insulation requiring a longer shank (the 'L' or 'LL' designations), you should verify the insertion depth of the 3-inch probe before installation.

What is the maximum BTU rating for this valve?
This specific model is designed for hot water heaters and storage tanks with an input rating up to 100,000 BTU/hr. Using it on larger commercial boilers requires a higher-capacity valve.

How do I test if the valve is functioning?
Utilize the integrated manual test lever periodically to ensure the waterway is clear. Always ensure a discharge pipe is connected and routed to a safe floor drain before testing.

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.