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3/4 In Lead Free Thermostatic Mixing Valve, Solder Union End Connections, Adjustable Out 80-120 F
LFMMVM1-US 3/4 - spec sheet
LFMMVM1-US 3/4 - spec sheet
Manufacturer Resources
Product Specs
- Body Finish:
- Rough Bronze
- Body Material:
- Lead Free Copper Silicon Alloy
- Brand Name:
- Watts
- Buy American Act Compliant:
- USA
- Capacity:
- 13 GPM at 45PSI
- Cold Inlet Temperature Range:
- 39 to 85 degree F
- Cold Water Bypass:
- No
- Cold Water Inlet Connection Size:
- 3/4 IN
- Cold Water Inlet Connection Type:
- Socket
- Ean:
- 98268451818
- Factory Set Temperature Fahrenheit:
- 105
- Flow Rate:
- 0.5 to 20 GPM
- Hot Inlet Temperature Range:
- 120 to 180 degree F
- Hot Water Inlet Connection Size:
- 3/4 IN
- Hot Water Inlet Connection Type:
- Socket
- Lead Free:
- Yes
- Maximum Pressure Differential:
- 25 Percent
- Maximum Working Pressure Psi:
- 150
- Minimum Differential Temperature Fahrenheit:
- 5
- Minimum Static Pressure Psi:
- 30
- Outlet Connection Size:
- 3/4 IN
- Outlet Connection Type:
- Socket
- Outlet Temperature Accuracy:
- +/- 7 degree F
- Part Number:
- 559118
- Series:
- LFMMV
- Temperature Adjustment Range:
- 80 to 120 degree F
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Mixing Valve
Watts LFMMVM1-US 3/4 – Frequently Asked Questions
1) What pipe connections does the Watts LFMMVM1-US 3/4 mixing valve use, and do I need adapters?
All three ports on the LFMMVM1-US 3/4 are 3/4 inch socket (solder) union connections: hot inlet, cold inlet, and mixed outlet. If you are running 3/4 inch copper tube you sweat straight into it with no adapters. Threaded or PEX systems need transition fittings at each port.
2) What temperature range can I set this Watts thermostatic mixing valve to?
Adjustable from 80 to 120 degrees F on the outlet, and it leaves the factory set at 105 degrees F. Control accuracy is plus or minus 7 degrees F. That range makes it a point-of-use / domestic tempered water valve, not a boiler or high-temp storage mixing valve.
3) What hot and cold supply temperatures does the LFMMV valve need to work correctly?
Hot inlet must land between 120 and 180 degrees F, cold inlet between 39 and 85 degrees F, and you need at least 5 degrees F of difference between the hot supply and your setpoint. If your water heater is set at 110 and you want 105 out, the valve will not hold the setpoint.
4) Is the Watts LFMMVM1-US lead free for potable water?
Yes. The body is a lead free copper silicon alloy with a rough bronze finish, and the valve is flagged lead free for potable water service. The -US designation also carries Buy American Act compliance, which matters on federal and institutional jobs with domestic sourcing requirements.
5) What water pressure does this thermostatic mixing valve require, and what is its pressure rating?
You need a minimum of 30 PSI static pressure, and the hot and cold sides must be within 25 percent of each other on pressure differential. Maximum working pressure is 150 PSI. If your hot and cold pressures are badly unbalanced, correct that first or the outlet temperature will wander.
6) Does this Watts mixing valve have a cold water bypass?
No cold water bypass on the LFMMVM1-US 3/4. If the cold supply fails the valve shuts down flow rather than passing hot through, which is the behavior you want for scald protection but means no water at the fixture during a cold-side interruption. If your application specifically requires bypass behavior, this is the wrong model.
7) Which Watts part number do I order for the 3/4 inch solder union master mixing valve?
Order the LFMMVM1-US 3/4, part number 559118, from the Watts LFMMV series. The M1 designation is the solder union end version in 3/4 inch; ordering by series alone will get you a different end connection.
8) Can I use this valve to hold a tank at 140 and deliver tempered water to fixtures?
Yes, that is exactly the setup it suits. Store at 140 for Legionella control, feed the hot inlet (which accepts 120 to 180 F), and dial the outlet down within the 80 to 120 F band. Keep in mind the outlet holds to plus or minus 7 degrees F, so if a code official is enforcing a tight ASSE point-of-use limit at the fixture, a dedicated point-of-use valve at the fixture is the better fit.
How fast can I get the Watts LFMMVM1-US 3/4 delivered?
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Watts LFMMVM1-US 3/4 come with a warranty?
Absolutely. The Watts LFMMVM1-US 3/4 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Watts LFMMVM1-US 3/4?
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