The Watts LF1170M2-CEF 1/2 is a 1/2" lead-free master mixing valve with PEX connections. It blends hot and cold water to hold a field-adjustable outlet temperature of 90°F to 160°F. It is listed to ASSE 1017. It features a copper body and a epdm seat. Rated to 150 psi. This model is certified lead-free for potable-water installations.
This 1/2 inch lead free hot water control valve is designed for installation on water heating equipment to provide tempered water to point-of-use fixtures and is ideal for radiant heat applications. The double throttling design combines hot and cold water control for a sensitive response to water temperature changes in the mixing chamber. It consists of a lead free brass body, cold expansion fitting (CEF/PEX F1960) end connections for PEX-a tubing, solid wax hydraulic principle thermostat, integral filter washers and check valves, virtual shutoff upon loss of cold water supply, and a locking mechanism for the temperature setting. The maximum pressure is 150 psi (10.3 bar). The adjustable field range temperature is 90 to 160 degrees F (32 to 71 degrees C).
Features
- Lead free brass construction
- Thermal actuation technology for precise temperature control
- Integral filter washers and check valves
- ASSE 1017 certified, IAMPO cUPC certified, approved to CSA B125.3
Common Questions
- Can I use this at a lavatory — is it ASSE 1070 listed?
- No. This valve is listed to ASSE 1017 only, which is a point-of-distribution standard: it tempers water leaving the water heater for the building distribution piping. An ASSE 1017 valve should never deliver water directly to a user. For a lavatory you need an ASSE 1070 listed valve, and for a shower an ASSE 1016 device — install one of those downstream of this valve.
- What temperature range does it deliver?
- The outlet temperature is field-adjustable from 90°F to 160°F. The hot inlet may be supplied at up to 200°F. It holds that setting down to 0.5 gpm of flow. Set it for the distribution system, not for the fixture — a point-of-use valve downstream sets the final delivered temperature.
- Does it have integral checks?
- Yes. Check valves are built into the hot and cold inlets to stop cross-flow between the supplies, along with integral filter washers/screens that keep debris off the thermostat. No separate check valves are needed at the valve.
- Can I lock the temperature setting?
- Yes. A locking mechanism secures the temperature setting once it is dialed in, so it cannot be moved without deliberately unlocking it.
- What happens if the cold water supply fails?
- The valve shuts down to a virtual drip, so a cold-supply failure cannot send full-temperature hot water downstream.
Specifications
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Type: Mixing/Tempering
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Size: 1/2"
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Connection: PEX
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Body Material: Copper
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Seat / Seal Material: EPDM
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Max Pressure (psi): 150
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Pack Quantity: 12
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Country of Origin: United States
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Warranty: 1 Year Limited
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MPN: LF1170M2-CEF 1/2
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Certifications: ASSE-1017, IAPMO
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Lead-Free: Yes
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ASSE Listing: ASSE 1017
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Install Point: Point of Distribution
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Outlet Temp — Min (°F): 90
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Outlet Temp — Max (°F): 160
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Minimum Controllable Flow (gpm): 0.5
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Integral Checks & Filter Washers: Yes
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Locking Temperature Adjustment: Yes
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Shutoff on Cold-Supply Failure: Yes
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Temperature Gauge Included: No
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Max Hot Inlet Temp (°F): 200
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Union Connections: Yes
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Applications: Water Heater;Tankless / Boiler;Radiant Heat;Whole House
