Watts 0559104 Valve

The Watts 0559104 (Model LF1170-M2-UT) is a high-performance 3/4 inch thermostatic mixing valve designed for master mixing applications in potable water and radiant heating systems. As a veteran-grade lead free hot water temperature control valve, it utilizes a sophisticated "double throttling" design to simultaneously manage both hot and cold water inlets. This ensures a rapid and precise response to supply temperature fluctuations, maintaining a stable discharge temperature. This ASSE 1017 mixing valve is built with a rugged lead free copper silicon alloy body and features threaded union connections for straightforward serviceability and replacement of legacy units like the 0206010 or LF1170M2-UT-3/4 models.

Engineered for versatility, this valve handles flow rates from 0.5 to 23 GPM and maintains an adjustable output range of 90°F to 160°F. For safety, it is designed to restrict flow to a mere drip if the cold water supply is lost, preventing high-temperature discharge. The Watts LF1170 series also incorporates integral check valves and stainless steel filter washers to prevent cross-flow between the hot and cold lines, ensuring long-term system integrity in demanding commercial or residential environments.

Key Benefits for Contractors:

• Precise Thermal Control: Solid wax hydraulic thermostat provides accurate mixing within +/- 3°F to meet ASSE 1017 standards.
• Lead Free Compliance: Constructed from lead free brass to meet all federal and state potable water requirements.
• Simplified Installation: Features 3/4" FNPT union threaded connections that facilitate quick installation and future maintenance access.
• Integrated Protection: Dual integral check valves and filter washers protect the system from debris and thermal siphoning.
• Tamper Resistance: Includes an adjustment cap with a locking feature to prevent unauthorized temperature changes after commissioning.

Common Questions:

Can this valve be used for anti-scald protection at the shower head?
No, this is an ASSE 1017 listed master mixing valve intended for point-of-source installation near the water heater. For point-of-use anti-scald protection at fixtures, and to meet ASSE 1016 or 1070 requirements, you must use a specific tempering valve at the tap.

What is the minimum temperature differential required for operation?
For optimal performance, the Watts 1170-M2 requires a minimum of 5°F difference between the hot water inlet and the desired tempered outlet temperature.

Can the Watts 0559104 be installed in any orientation?
Yes, the valve is designed to be installed in any position, though it is standard practice to install it with a heat trap to prolong the life of the internal wax element.

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.