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Tankless coil mixer valve

stevel87125
stevel87125 Member Posts: 7
in Oil Heating
On a new install, with a tankless coil, I see no automatic mixing valve, but a manual gate valve.
With low and high limits set on 160 and 180 respectively, how is a safe DHW temperature regulated?
Thank you

Comments

  • Mad Dog_2
    Mad Dog_2 Member Posts: 7,518
    A Picture would help to verify...but that's temperature blending from 50 years ago!  You need a Watts or Taco Domestic How water mixing valve....and a thermometer Guage in the mixed outlet is ideal.  Mad Dog 🐕 
    Consulting by Mad Dog & Matt Jr.
    Intplm.MikeAmann
  • bburd
    bburd Member Posts: 1,039
    A gate valve? Those must be either fully open or fully closed. Before thermostatic mixing valves became required / standard, a globe valve was normally used as appropriate for throttling service.
    —
    Bburd
    MikeAmannSuperTech
  • hot_rod
    hot_rod Member Posts: 23,371
    A 520 Caleffi is ideal for  tankless and tankless coil.  Fast responding  and if it loses hot or cold, it shuts down. 
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    SuperTech
  • stevel87125
    stevel87125 Member Posts: 7
    There is no mixing valve. How is the DHW being maintained at a safe temperature?

  • pecmsg
    pecmsg Member Posts: 5,290
    stevel87125 said:

    There is no mixing valve. How is the DHW being maintained at a safe temperature?

    It's not. The hand valve is old school, run the hot water and manually adjust the hand valve unitl its tempered down.
    Today 120°F is maximum for point of use.

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