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Watts thermostatic mixing valve, transparent copper silicon alloy body, union inlet and threaded outlet

Watts

Watts LFMMV-M1-UT Thermostatic Mixing Valve 1 in 13 gpm

SKU CH-2Q4T-F0BCQ

Thermostatic mixing valve blends hot and cold water to 80–120 °F at 13 gpm for domestic hot-water systems

  • Product colorTransparent
  • Product typePipes, Valves & Fittings
  • Delivers stable mixed water at 13 gpm
  • Protects users from scalding across 80–120 °F range
  • Handles supply pressures up to 150 psi
  • Accepts hot inlet temperatures up to 180 °F
  • Works with cold inlet temperatures down to 33 °F

Application fit

The Watts LFMMV-M1-UT thermostatic mixing valve blends hot and cold water to deliver a stable outlet temperature between 80 and 120 degrees F at flow rates up to 13 gpm. It is designed for domestic hot water systems where scald protection and temperature consistency are required. The copper silicon alloy body handles inlet pressures up to 150 psi.

Who this suits and who it does not

This valve suits installers needing a 1-inch union inlet and threaded outlet connection for point-of-distribution temperature control in residential or light commercial plumbing. It is not for systems that demand a higher flow capacity than 13 gpm, or for applications where the hot supply exceeds 180 degrees F or the cold supply falls below 33 degrees F.

Deciding specification

The 13 gpm flow rating at the stated pressure and temperature ranges is the single figure that determines whether this valve can serve the intended fixture group without excessive pressure drop or temperature drift.

How it compares

Measured against everything we stock in Bath Accessories & Soap Dispensers, at today’s prices. Recalculated every night.

Price $422.99
Pricier than about 91% of the 1,499 comparable items (median $39.99).

Specifications

Product
Brand nameWATTS
Product colorTransparent
Product typePipes, Valves & Fittings

Questions about this item

What inlet and outlet connections does the 1 in thermostatic mixing valve use?

The valve has a 1 in union inlet and a 1 in threaded outlet for copper or threaded pipe connections.

How is the valve installed and which step is often missed?

Install horizontally with hot on the left and cold on the right; the step often missed is flushing the lines before final tightening.

When should the internal cartridge be checked or replaced?

Inspect the cartridge annually and replace it if the outlet temperature drifts outside the 80 to 120 Degrees F range.

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