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3/4 IN Lead Free Thermostatic Mixing Valve, Solder Union End Connections, Adjustable Out 80-120 F
0559118 - spec sheet
0559118 - 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:
- 3/4 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:
- 3/4 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:
- 3/4 IN
- Outlet Connection Size Metric:
- 20 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 559118 – Frequently Asked Questions
1) What pipe connections does the Watts 0559118 mixing valve have, and do I need adapters?
All three ports on the Watts LFMMV 0559118 are 3/4 inch solder socket union connections: hot inlet, cold inlet, and mixed outlet. That means you sweat it directly onto 3/4 inch copper tube (20 mm), no threaded adapters needed. If your lines are threaded or PEX, you'll need transition fittings at each port, since there is no thread type on this valve.
2) What temperature range can the Watts 0559118 be set to, and what does it come set at out of the box?
Adjustable from 80 to 120 degrees F, and it ships factory set at 105 degrees F. Outlet accuracy is plus or minus 7 degrees F, so at a 120 setting you could see up to about 127 at the tap. If your facility needs tighter control than that at a fixture, use a point-of-use valve downstream in addition to this one.
3) Will a 3/4 inch Watts LFMMV thermostatic mixing valve handle a whole apartment or small building?
Flow range is 0.5 to 20 GPM, with a rated capacity of 20 GPM at 125 PSI. That covers a typical apartment or a small multi-fixture zone. The low end matters as much as the high end: it still regulates down to 1/2 GPM, so a single lavatory running alone won't fall out of control. For larger central systems drawing past 20 GPM you need a bigger body or valves in parallel.
4) What water heater temperature do I need for this Watts mixing valve to work correctly?
The hot inlet has to be between 120 and 180 degrees F, and the valve needs at least 5 degrees F of differential between the hot supply and your target mixed temperature. So if you're setting the outlet at 120, the tank has to run at least 125. Storing at 140 and mixing down is the usual approach, and it stays well inside the valve's inlet window. Cold inlet is rated 39 to 85 degrees F.
5) Is the Watts 0559118 lead free and legal for potable water?
The body is a lead free copper silicon alloy with a rough bronze finish, which is what the LF in the LFMMV series designation refers to. That's the construction required for potable water service under the federal lead free rules for drinking water plumbing.
6) What water pressure does the Watts LFMMV 0559118 need, and what is the pressure limit?
Minimum 30 PSI static pressure to operate, maximum working pressure 150 PSI. It also tolerates up to 25 percent pressure differential between the hot and cold inlets. On a well system with a pump cutting in around 30 PSI, you're at the bottom of the range, so raise the low cut-in or expect drift at the outlet.
7) Does this Watts mixing valve have a cold water bypass?
No, the 0559118 has no cold water bypass. If the hot supply fails, the valve throttles down rather than passing full cold through the outlet. Where a building needs cold water to keep flowing at the fixture if hot is lost, specify a bypass-equipped valve instead of this one.
8) What is the Watts part number to order for the 3/4 inch solder lead free mixing valve?
Order Watts 0559118, manufacturer part number 559118, in the LFMMV series. That's the 3/4 inch solder union end version, adjustable 80 to 120 degrees F.
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Does the Watts 559118 come with a warranty?
Absolutely. The Watts 559118 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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