You may also like
1/2 In Thermostatic Mixing Valve, Solder Union End Connections, Adjustable Out 80-120 F
MMV-US-M1 120F 1/2 - spec sheet
MMV-US-M1 120F 1/2 - spec sheet
Manufacturer Resources
Product Specs
- Brand Name:
- Watts
- Cold Inlet Temperature Range:
- 39 to 85 degree F
- Cold Water Bypass:
- No
- Cold Water Inlet Connection Size:
- 1/2 IN
- Cold Water Inlet Connection Type:
- Union Solder
- Ean:
- 98268453508
- Factory Set Temperature Fahrenheit:
- 105
- Hot Inlet Temperature Range:
- 120 to 180 degree F
- Hot Water Inlet Connection Size:
- 1/2 IN
- Hot Water Inlet Connection Type:
- Union Solder
- Maximum Pressure Differential:
- 25 percent
- Minimum Differential Temperature Fahrenheit:
- 5
- Minimum Static Pressure Psi:
- 30
- Outlet Connection Size:
- 1/2 IN
- Outlet Connection Type:
- Union Solder
- Outlet Temperature Accuracy:
- +/- 3 degree F
- Part Number:
- 206070
- Series:
- MMV
- Temperature Adjustment Range:
- 80 to 120 degree F
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Mixing Valve
Watts MMV-US-M1 120F 1/2 – Frequently Asked Questions
1) What pipe connections does the Watts MMV-US-M1 120F 1/2 mixing valve use?
All three ports on the MMV-US-M1 are 1/2 inch union solder: hot inlet, cold inlet, and mixed outlet. The union tailpieces mean you sweat the adapters onto the copper first, then thread the valve body on, so the valve can be pulled later for service without cutting pipe. If your rough-in is threaded or PEX, you'll need transition fittings to 1/2 inch copper.
2) What temperature can I set the Watts MMV-US-M1 120F valve to?
Adjustable from 80 to 120 degrees F, and it leaves the factory set at 105 degrees F. Outlet accuracy is plus or minus 3 degrees F once it is running. The 120 degree ceiling is the point for most jobs, since it caps what reaches the fixture even if the tank is running hotter for storage.
3) Can I use this Watts mixing valve on a water heater set to 140 degrees for Legionella control?
Yes. The MMV-US-M1 accepts hot inlet water from 120 to 180 degrees F, so a tank held at 140 is well inside range. You store hot to suppress bacteria growth and let the valve knock the distributed temperature back down to your setpoint, anywhere from 80 to 120 degrees F.
4) What water pressure does the Watts MMV-US-M1 need to work properly?
Minimum 30 psi static pressure, and the hot and cold supplies need to stay within 25 percent of each other on pressure differential. Wells on a low-cut-in pressure switch or gravity systems can fall short of the 30 psi floor. If one side is heavily throttled by a partly closed stop or a clogged strainer, you'll drift outside the 25 percent window and the outlet temperature will wander.
5) Why won't my mixing valve hold the setpoint I picked?
The MMV-US-M1 needs at least 5 degrees F of differential between the hot supply and your target outlet temperature. Set the valve to 120 with a tank only reaching 122 and it has nothing to modulate with. Cold side matters too: it is rated for cold inlet from 39 to 85 degrees F, so very warm incoming cold in summer can push a low setpoint out of reach.
6) Does the Watts MMV-US-M1 have a cold water bypass?
No cold water bypass on this one. Everything going to the outlet passes through the thermostatic element, so the valve cannot be defeated by a bypass path. On a tempering install that is what you want, but it also means if the valve fails you lose the branch entirely rather than getting cold water through.
7) What is the Watts part number for the 1/2 inch solder MMV mixing valve?
Watts part number 206070, catalogued as MMV-US-M1 120F 1/2 in the MMV series. The 120F in the designation refers to the 120 degree F top of the adjustment range, and the 1/2 is the connection size on all three ports.
8) Do I need to adjust the Watts MMV-US-M1 after installing it?
Only if 105 degrees F is not your target. It ships factory set at 105, which is a common domestic hot water delivery temperature already. If your spec calls for a different number anywhere from 80 to 120 degrees F, dial it in and verify at the fixture with a thermometer, since the valve holds to plus or minus 3 degrees F.
How fast can I get the Watts MMV-US-M1 120F 1/2 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
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 MMV-US-M1 120F 1/2 come with a warranty?
Absolutely. The Watts MMV-US-M1 120F 1/2 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 MMV-US-M1 120F 1/2?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Watts MMV-US-M1 120F 1/2 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.