3/4" NPT Union Mixing Valve (Heating Only) Zoom

3/4" NPT Union Mixing Valve (Heating Only)


Brand: Honeywell-Sparco

Qty Price
/ each
$250.35 / box (3 units x $83.45)
In Stock! Ships in 24-48 Hours
(24 Available)



Size: 3/4"
Material: Brass
Connection Type: Threaded
Flow Capacity (Cv): 3.9
Max Temp (F): 180°F
Temperature Range (F): 70°F - 180°F
Min Temp (F): 70°F
Max Pressure (PSI): 150
Type: Mixing Valve
Application: Point of Source
Heating Only

Description for Honeywell-Sparco AM101R-UT-1

The Honeywell AM-1 series accurately adjusts, maintains and limits the hot water temperature to a desired setting selected by the user. By installing a Honeywell AM-1 mixing valve and raising water heater storage temperature setting and limiting mixed outlet water temperature to safe temperature more usable hot water is available. In heating applications it provides comfort and protects the equipment. Multiple applications include heat pump systems, nursing homes, public facilities, automatic faucets, radiant floor heating, space heating, combo systems, solar hot water, greenhouses, and industrial applications.


  • Dual purpose mixing or diverting valves
  • Constant water temperature under changing operating conditions
  • Reliable performance at minimum flow of 0.5 gpm
  • Proportional valve (simultaneous control of hot and cold water)
  • Temperature limit at any point
  • Flow reduction in seconds if cold water supply is interrupted
  • Nickel-plated brass construction, EPDM O-rings
  • High performance thermoplastic proportioning shuttle
  • Straight through design (hot and cold at the same level)
  • Max. pressure 150 psi (1034 kPa)
  • Max temperature 212 F (100 C)
  • Designed for easy maintenance and element replacement. TeflonĀ® coating of internal valve components to prevent mineral build-up and extend life.
  • Tamper-resistant design
  • Valve trapping not required
  • AM-1 Union STD & C and AM1070 Models include check valves on both hot and cold ports
  • ASSE, CSA and IAPMO listed
  • U.S. Patent No. 6,079,625

3/4" NPT Union Mixing Valve (Heating Only)


by PowerReviews
Honeywell-Sparco3/4" NPT Union Mixing Valve (Heating Only)

(based on 4 reviews)

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars




of respondents would recommend this to a friend.


No Pros


No Cons

Best Uses

No Best Uses
    • Primary use:
    • Personal (3)

Reviewed by 4 customers

Displaying reviews 1-4

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Item works as expected

By Bill

from Central Square N.Y.

Verified Buyer

Comments about 3/4" NPT Union Mixing Valve (Heating Only):

One issue I had is something as simple as using the adjusting knob. You need to loosen a screw just to adjust the water temp.This screw is covered by a sticker so who woulda thunk it?? I proceeded to force it which makes a clicking sound which makes you think its broke outa the box. I then took the valve apart to investigate and eventually figured it out. Then I read the instructions. Ok I am a fool but do you read the instructions to push the gas pedal on a car. Over engineered but it is a nice item and I have heat and it does adjust!

  • Primary use:
  • Personal

Very responsive

By md57

from Western WI

Verified Buyer

Comments about 1" Union NPT Mixing Valve, 70-180 F (Heating Only):

Easy install with unions. Very reponsive to temperature adjustments. Simple to rebuild if ever needed. A good value.

  • Primary use:
  • Business

Works as advertised


from Pittsburgh, PA

Verified Reviewer

Comments about 1" Union NPT Mixing Valve, 70-180 F (Heating Only):

I use this mixing valve for slab on grade radiant. Responds immediately to dialed in temperature settings. Temperature stability good. Supplied temperature indicator strip assures quick and accurate setup.

  • Primary use:
  • Personal

Best Price Online!

By Les

from New Braintree, MA

Verified Buyer

Comments about 1" Union NPT Mixing Valve, 70-180 F (Heating Only):

Best price; [...] easy installation & operation. I am very pleased with this valve and PexSupply.

  • Primary use:
  • Personal

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Q&A: Ask the Questions, share answers

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Get answers from real customers and in-house experts with AnswerBox.

2 Questions | 5 Answers
Displaying questions 1-2
  • 3/4" NPT Union Mixing Valve (Heating Only)


    Why does it say heating only? Can i use this to regulate my domestic hot water output from hot water tank that is heated via my wood boiler system?
    Asked on 11/19/2013 by Newguy from Sudbury, Ontario

    2 answers



      Because the internal components of a heating only unit cannot be used for a domestic water system.
      Sent from my iPad

      Answered on 11/19/2013 by Bob from Long Island


      We would not recommend it. This valve is not lead-free, it is not approved for use with potable water, and it does not meet the precision and safety standards that you would want to prevent scalding.

      Answered on 11/20/2013 by PexSupply Staff from NY
  • 1" Union NPT Mixing Valve, 70-180 F (Heating Only)


    Does orientation matter or can this unit be installed with adjustment knob on the side instead of top as shown?
    Asked on 5/23/2013 by New to Radiant

    3 answers



      Orientation does not matter

      Answered on 5/23/2013 by Garth from New Brunswick


      Any position is fine.....Bob S.

      Answered on 5/30/2013 by Bob from Long Island


      Orientation does not effect operation but it can effect convenience of

      Answered on 5/28/2013 by Anonymous
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