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1/2 IN Lead Free Thermostatic Mixing Valve, Solder Union End Connections, Adjustable Out 80-120 F
0559115 - spec sheet
0559115 - spec sheet
Manufacturer Resources
Product Specs
- Body Finish:
- Rough Bronze
- Body Material:
- Lead Free Copper Silicon Alloy
- Capacity:
- 20 GPM at 125 PSI
- 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:
- Socket
- Cold Water Inlet Thread Type:
- Does Not Apply To Product
- Factory Set Temperature:
- 105°F
- 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:
- 1/2 IN
- Hot Water Inlet Connection Type:
- Socket
- Hot Water Inlet Thread Type:
- Does Not Apply To Product
- Maximum Pressure Differential:
- 25 Percent
- Maximum Working Pressure:
- 150
- Minimum Differential Temperature:
- 5°F
- Minimum Differential Temperature Fahrenheit:
- 5
- Minimum Static Pressure:
- 30 PSI
- Minimum Static Pressure Psi:
- 30
- Mobileappcompatibility:
- Does Not Apply To Product
- Outlet Connection Size:
- 1/2 IN
- Outlet Connection Size Metric:
- 15 MM
- Outlet Connection Type:
- Socket
- Outlet Temperature Accuracy:
- +/- 7 degree F
- Outlet Thread Type:
- Does Not Apply To Product
- Series:
- LFMMV
- Temperature Adjustment Range:
- 80 to 120 degree F
- Wifienabled:
- No
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Mixing Valve
Watts 559115 – Frequently Asked Questions
1) What kind of pipe connections does the Watts 0559115 mixing valve have?
The Watts LFMMV 0559115 has 1/2 inch solder socket union connections on all three ports: hot inlet, cold inlet, and mixed outlet. No threads, so you sweat it onto 1/2 inch copper (15 mm). The union nuts mean you can break the valve out for service without cutting the lines.
2) What temperature does the Watts 0559115 come set at, and how far can I adjust it?
It ships factory set at 105 degrees F and adjusts from 80 to 120 degrees F. Outlet accuracy is plus or minus 7 degrees F, so if you are dialing in a shower or lav for a tenant, set it and verify at the fixture with a thermometer rather than trusting the dial alone.
3) Will a 1/2 inch Watts LFMMV thermostatic mixing valve handle a whole-house or multi-fixture load?
Flow range is 0.5 to 20 GPM, with a rated capacity of 20 GPM at 125 PSI. That covers a point-of-use fixture at the low end and a small domestic hot water supply at the high end. The important limit is the bottom: below 0.5 GPM the valve is out of its control range, so a single trickling faucet will not regulate reliably.
4) What water heater setting and supply pressure do I need for the Watts 0559115 to work correctly?
Hot inlet must be between 120 and 180 degrees F and cold inlet between 39 and 85 degrees F. The hot supply also has to run at least 5 degrees F above your setpoint, so a tank at 115 will not hold a 120 degree mix. On pressure, you need a minimum of 30 PSI static, the valve is good to 150 PSI working, and hot-to-cold pressure differential should stay within 25 percent.
5) I have threaded or PEX stub-outs. Will the Watts 0559115 connect?
Not directly. All three ports on the 0559115 are 1/2 inch solder sockets with no thread option, so you would need copper stubs or adapters sweated in. If the job is threaded or PEX, order the threaded-union version of the Watts LFMMV rather than this one.
6) Does the Watts 0559115 shut off the hot water if the cold supply fails?
No. The LFMMV 0559115 has no cold water bypass, and it is a thermostatic mixing valve rather than a scald-protection shower valve. If you need a fixture-level anti-scald device at the shower or tub, specify a pressure balancing or thermostatic shower valve separately. This one is a supply-side tempering valve.
7) Is the Watts 0559115 mixing valve safe for potable drinking water lines?
The body is a lead free copper silicon alloy, so it is built for potable domestic water service. Finish is rough bronze, which is normal for a valve installed in a mechanical room or above a ceiling rather than in a finished space.
8) Can I use this valve to temper the outlet of a water heater running at 140 degrees for Legionella control?
Yes, that is the typical use. A hot inlet at 140 F sits inside the accepted 120 to 180 F range, and you can dial the mixed outlet anywhere from 80 to 120 F for distribution. With a 20 GPM capacity it works on the heater outlet or on a branch feeding a group of fixtures.
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reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Watts 559115 come with a warranty?
Absolutely. The Watts 559115 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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