Watts LFMMVM1-UT-100 Thermostatic Mixing Valve 1 Inch

Product Description

The WATTS LFMMVM1-UT-100 is a 1-inch lead free thermostatic mixing valve engineered for precise mixed-water temperature control in residential, commercial, and institutional plumbing systems. The valve uses a double throttling design to regulate both hot and cold water supply simultaneously, delivering tempered water to baths and lavatories at a stable, adjustable outlet temperature. The wax-element hydraulic thermostat responds automatically to fluctuations in supply pressure or temperature, maintaining the set point without manual intervention. The lead free brass body and threaded union end connections make this valve suitable for potable water systems where lead-free compliance is required.

This valve is installed in domestic hot water distribution systems to supply tempered water to fixtures such as bathtubs, showers, and lavatories. It is appropriate for residential homes, hotels, schools, healthcare facilities, and other commercial or institutional buildings where scald protection and water temperature consistency are required. The threaded union connections simplify installation and future removal for service. The locking temperature adjustment mechanism prevents unauthorized changes to the set point once the commissioning temperature is established by the installing plumber.

Key Features

• Lead free brass body meets lead-free potable water requirements
• Double throttling design regulates both hot and cold inlets for stable mixed outlet temperature
• Solid wax hydraulic principle thermostat provides automatic temperature compensation
• Adjustable mixed outlet temperature range of 80 to 120 degrees F (27 to 49 degrees C)
• Integral filter washers protect internal components from debris
• Integral check valves prevent cross-flow between hot and cold supplies
• Locking mechanism secures temperature set point after commissioning

Compatibility

Designed as an OEM-style replacement or new-installation thermostatic mixing valve for 1-inch threaded plumbing systems in residential, commercial, and institutional potable water applications requiring tempered water delivery to baths and lavatories.

Installation Notes

Installation should be performed by a licensed plumber in accordance with applicable local plumbing codes and ASSE 1017 or equivalent standards for thermostatic mixing valves. Shut off both the hot and cold water supplies and relieve system pressure before making any connections. Threaded union connections should be made with appropriate thread sealant rated for potable water service. After installation, verify the mixed outlet temperature with a calibrated thermometer before locking the temperature adjustment.

Technical Specifications

• Pipe Size: 1 inch
• End Connection: Threaded union
• Adjustable Outlet Temperature Range: 80 to 120 degrees F (27 to 49 degrees C)
• Maximum Pressure Rating: 150 psi
• Body Material: Lead free brass
• Thermostat Type: Solid wax hydraulic principle

Standard Information

• Brand: WATTS
• Manufacturer Part Number: LFMMVM1-UT-100