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1 In Lead Free Thermostatic Mixing Valve With Solder Union End Connections, Adjustable Out 80-120 F
LFMMVM1-US 1 - spec sheet
LFMMVM1-US 1 - 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:
- 1 IN
- Cold Water Inlet Connection Type:
- Socket
- Ean:
- 98268451849
- 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:
- 1 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:
- 1 IN
- Outlet Connection Type:
- Socket
- Outlet Temperature Accuracy:
- +/- 7 degree F
- Part Number:
- 559121
- 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 1 – Frequently Asked Questions
1) What pipe connections does the Watts LFMMVM1-US 1 mixing valve have?
All three ports on the LFMMVM1-US 1 are 1 inch solder socket unions: hot inlet, cold inlet, and mixed outlet. That means you sweat it to 1 inch copper tube. If your rough-in is threaded, this body won't thread on without adapters, so plan the transition or pick a threaded-union version of the LFMMV series instead.
2) What temperature range can this Watts thermostatic mixing valve be set to?
The LFMMVM1-US adjusts from 80 to 120 degrees F and leaves the factory set at 105. Accuracy is plus or minus 7 degrees F, so if you are targeting a specific delivery temperature at a fixture, check it with a thermometer at the tap and trim the setting after the system is up to temperature.
3) What water heater temperature do I need for this Watts LFMMV mixing valve to work properly?
Feed it between 120 and 180 degrees F on the hot side, with cold inlet anywhere from 39 to 85 degrees F. It also needs at least 5 degrees F of difference between the hot supply and your set outlet temperature to control. So a tank sitting at 110 will not let you hold a 120 degree mix reliably; run the heater hotter and let the valve temper it down.
4) How many fixtures or gallons per minute will the 1 inch Watts LFMMVM1-US handle?
Rated capacity is 13 GPM at 45 PSI, with a usable control range of 0.5 to 20 GPM. The low end matters as much as the high end on a multi-fixture system: a single lavatory drawing under a half gallon a minute can fall below the control range, so size it to the load it will actually see rather than the largest number on the sheet.
5) What water pressure does this thermostatic mixing valve require?
Minimum static pressure is 30 PSI and maximum working pressure is 150 PSI. Just as important, hot and cold pressure must stay within 25 percent of each other; larger imbalance and the valve will hunt on temperature. On a system with a pressure-reduced cold line or a recirculation pump on the hot, check both sides before you blame the valve.
6) Is the Watts LFMMVM1-US lead free for potable water?
Yes. The body is a lead free copper silicon alloy in rough bronze, and Watts lists the valve as lead free, which is what you need for potable domestic hot water in jurisdictions enforcing lead-free plumbing rules.
7) Does this Watts mixing valve have a cold water bypass?
No. The LFMMVM1-US 1 is built without a cold water bypass, so it will not blend in unmixed cold if the hot supply fails. If your spec calls for a bypass feature, this is the wrong model in the LFMMV family.
8) Is the Watts LFMMVM1-US Buy American compliant for a government job?
Watts lists this valve as Buy American Act compliant, USA. That matters on federal, military, and many state or municipal projects where domestic-content language is in the contract.
How fast can I get the Watts LFMMVM1-US 1 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 1 come with a warranty?
Absolutely. The Watts LFMMVM1-US 1 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 1?
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