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Brass thermostatic mixing valve with union inlet and solder outlet connections

Watts

Watts LF1170-M2-US thermostatic mixing valve 1 in 23 gpm

SKU CH-WVNV-3K3FC

Thermostatic mixing valve blends hot and cold water to 90–160 °F at 23 gpm for domestic hot water systems

  • TypeOther
  • Delivers up to 23 gpm for high-demand systems
  • Maintains 90–160 °F output for consistent comfort
  • Handles inlet temps from 40 °F cold to 200 °F hot
  • Brass body withstands 150 psi maximum pressure
  • Union inlet and solder outlet simplify 1 in connections

Watts LF1170-M2-US thermostatic mixing valve

The Watts LF1170-M2-US is a thermostatic mixing valve designed for domestic hot water systems. It blends hot and cold water to deliver a controlled outlet temperature between 90 and 160 degrees Fahrenheit. The valve suits residential or light commercial installations requiring automatic temperature regulation at the point of distribution.

Sustained flow at 23 gpm

Under continuous demand the valve maintains its set temperature across a flow rate of 23 gpm while withstanding a maximum pressure of 150 psi. It accepts hot inlet temperatures from 120 to 200 degrees Fahrenheit and cold inlet temperatures from 40 to 85 degrees Fahrenheit, providing stable performance during prolonged draw periods without pressure-induced drift.

Brass body with union inlet and solder outlet

The brass body offers corrosion resistance for long service life in potable water applications. A 1 inch union inlet allows straightforward connection to existing supply lines, while the 1 inch solder outlet creates a permanent, leak-resistant joint. Overall dimensions of 5 7/8 inches in height and 5 13/16 inches in width fit standard rough-in cavities.

Highlights

  • Delivers up to 23 gpm for high-demand systems
  • Maintains 90–160 °F output for consistent comfort
  • Handles inlet temps from 40 °F cold to 200 °F hot
  • Brass body withstands 150 psi maximum pressure
  • Union inlet and solder outlet simplify 1 in connections

Specifications

BrandWATTS
TypeOther

Questions about this item

How much hot water can the LF1170-M2-US deliver continuously without overheating?

The valve handles a flow rate of 23 gpm and maintains outlet temperatures between 90 and 160 degrees F as long as the hot inlet stays within 120 to 200 degrees F and the cold inlet within 40 to 85 degrees F.

What pipe connections must already be in place for the LF1170-M2-US to install?

You need 1-inch union fittings on the inlet side and 1-inch solder connections on the outlet side, plus enough clearance for the 5 7/8-inch height and 5 13/16-inch width of the brass body.

Will the LF1170-M2-US protect older fixtures rated below 150 psi?

Yes, the valve's maximum working pressure is 150 psi, so it will not exceed the pressure rating of legacy fixtures designed for that limit or lower.

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