1-1/2" N170-M3 Commercial Master Tempering Valve Zoom

1-1/2" N170-M3 Commercial Master Tempering Valve


Brand: Watts

0478022 has been discontinued.
Direct Replacement:
SKU: 0559127
Brand: Watts

Do not use this item for any installation or repair of potable water applications. This product does not comply with the "Safe Drinking Water Act," which requires that products meet low-lead standards in order to be used in systems providing water for human consumption (drinking or cooking). This item is for non-potable (non-human consumption) water applications only.




Flow Capacity (Cv): 15.65
Size: 1-1/2"
Min Temp (F): 90°F
Max Temp (F): 180°F
Standards Met: ASSE 1017
Application: Point of Source
Material: Bronze
Temperature Range (F): 90°-180°F
Min Temp (F): 90°F
Max Pressure (PSI): 125 PSIG
Connection Type: Threaded

Description for Watts 0478022

The N170 Master Tempering Valve Series is designed for use in commercial and institutional applications, to mix hot and cold water to reduce high service water temperature to the building distribution piping system. The N170 series is designed for installation at the hot water source. Rough-in dimensions are identical to earlier N170 models making replacement fast and easy. The N170 features bronze body construction, a copper/paraffin thermostat assembly and a lockable temperature adjustment for increased safety. Polysulfone internals resist excessive heat, liming and corrosion, and a single-seat design ensures tight shut-off in the event of cold water supply loss. The N170 is listed to ASSE 1017 and IAPMO cUPC in compliance with CSA B125.3.


  • Solid bronze construction provides years of dependable service
  • Multi-directional mounting
  • ASSE 1017 and IAPMO CUPC Listed
  • N170-M3 uses paraffin-based thermostat to sense and adjust outlet temperature
  • Dirt and lime resistant poppet and seat design
  • Virtual shutoff if supply pressure fails
  • Vandal-resistant locking mechanism to secure temperature setting
  • Factory tested

Watts Has Improved the N170's All Around Performance...
  • ASSE 1017 listing and CSA B125.3 compliance ensure safe, consistent performance over time.
  • Broader temperature range eliminates the need for low temperature models. The M3 model operates safely over a range of 90-180°F (32°-82°C)
  • Vastly improved low flow control (as low as 3.0 gpm, 11 lpm) for applications where minimum flow performance is critical
  • Approach temperature (hot water inlet - mixed outlet) of 5°F (3°C) provides maximum mixed outlet temperature for installations where hot water is generated at lower temperatures
  • Now offered with checkstops and integrated filters for new installations as well as without for retrofit installations.

1-1/2" N170-M3 Commercial Master Tempering Valve


by PowerReviews
Watts1-1/2" N170-M3 Commercial Master Tempering Valve

(based on 1 review)

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Reviewed by 1 customer

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Good Product

By Jim

from USA

Verified Buyer

Comments about Watts 1-1/2" N170-M3 Commercial Master Tempering Valve:

Works well.

  • Primary use:
  • Business

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2 Questions | 2 Answers
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  • Q:

    How do you adjust this tempering valve?
    Asked on 8/9/2012 by anthony from atlanta,ga

    1 answer

  • Q:

    Can this be fixed to a solar water heater considering temperatures soar to high levels?


    Stefan Fenech
    Asked on 5/1/2012 by stef from MALTA

    1 answer



      This valve can only handle water temperatures up to 180°F. If temperatures in a solar-powered system exceed this figure (which they often do), this valve should not be used.

      Answered on 5/1/2012 by PexSupply Staff from NY
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