What is the min./max. Pressure for both inlets? And is there a drop in outlet pressure?

30-150 psi operating pressure. Negligible pressure drop.

What is the min./max. hot water temp. inlet? and how it will work if the hot temp. drop below the min.?

Min/Max HW inlet temp= 120 to 180 degrees. If the HW inlet water temp is below 120 the valve will simply pass cold water. The max pressure for both inlets is 150 PSI. There is no listed minimum pressure. Pressure drop varies with flow- at 6 GPM flow the pressure drop is 10 PSI.

My solar hot water will be feeding my electric tankless heater. This should drop the water from 180 to 120 degree before tankless heater right?

Yes- but a couple of cautions. The maximum outlet temperature setting is 120 degrees, and the maximum inlet hot water temp to get that 120 degrees is 180 degrees. The valve is rated to still function at 200 degree inlet temp but at anything over 180 you will likely end up with an outlet temp over 120.

The temperature adjustment knob will not turn. Is there a lock or trick to this?

To adjust the setting of the valve, loosen locking cap screw with hex wrench, see Figure 3. Cap must be lifted 1/4" to adjust temperature. To increase the temperature, turn counterclockwise. To decrease temperature turn clockwise. 4. Lower handle and tighten screw.

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🔥 Mix it right, lock it tight! 🔒

CERTIFIED RELIABILITY - ASSE 1017, 1069, 1070 & IAPMO cUPC listings guarantee trusted performance.
SECURE LOCKING ADJUSTMENT - Lock your settings to prevent accidental changes and maintain consistency.
PRECISION TEMPERATURE CONTROL - Set your perfect water temp between 80°F-120°F with ease.
ROBUST LEAD FREE CONSTRUCTION - Durable copper silicon alloy ensures safety and compliance.
INTEGRATED FILTRATION CHECK VALVES - Built-in washers and check valves protect your system from debris and backflow.

The Watts LFMMV-M1-UT is a 3/4" union inlet thermostatic mixing valve crafted from lead-free copper silicon alloy. It delivers precise temperature control from 80°F to 120°F at flow rates up to 13 GPM. Featuring a locking adjustment cap, integral filter washers, and check valves, it meets multiple ASSE certifications ensuring safety and reliability for both single and multiple fixture applications.

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Material	Alloy,Copper,Lead
Brand	Watts
Item dimensions L x W x H	16 x 11.4 x 6.6 Centimeters
Exterior Finish	Copper
Inlet Connection Type	Flange
Outlet Connection Type	Flange
Number of Ports	1
Specification Met	ASSE, NEMA
Manufacturer	Watts
UPC	098268451825
Item model number	LFMMV-M1-UT
Product Dimensions	16 x 11.43 x 6.6 cm; 1.01 kg
ASIN	B007VHHENG

Watts - LFMMV-M1-UT - 3/4 Union Inlet Type Thermostatic Mixing Valve,No Lead Copper Silicon Alloy, 13 gpm

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