Calibrating Navien NPE240A

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by dradam, May 8, 2020.

  1. dradam

    dradam Member

    Joined:
    Sep 21, 2008
    Location:
    Washington, DC
    When my Navien NPE 2401 tankless water heater is set to 120 degrees F I get 115 degrees at my farthest fixture. Set at 125 degrees I get 120 F at my farthest fixture. It there a way to calibreate the temp on these units-- I see nothing in the Manuals. Thanks
     
  2. plumber69

    plumber69 In the Trades

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    Jun 20, 2014
    Location:
    Prince Rupert, British Columbia
    What are you trying to accomplish? higher temperatures? if so I think you hold the + symbol for more then 2 seconds
     
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  4. fitter30

    fitter30 Active Member

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    Insulate the the pipe would help but there will always be a loss in temp. All pipe radiates heat copper loses more than plastic. By recalibrating the sensor will give you the temp you want but when there is a problem your wh will see 5* lower temp than what it is. So temperature difference between in & out will change the logic of the processor.
     
    Last edited: May 8, 2020
  5. dradam

    dradam Member

    Joined:
    Sep 21, 2008
    Location:
    Washington, DC
    Thanks for your replies. I understand there will be heat loss. I simply want to calibrate the machine reading with the actual temperature at the farthest fixture-- if there is a way.
    Thank
     
  6. Bannerman

    Bannerman Well-Known Member

    Joined:
    Mar 19, 2014
    Location:
    Ontario, Canada
    The temperature setting is measured at the WH. Perhaps the temperature in your home today results in a 5-degree loss when reaching the far end, but 2 months from now, the home interior could be warmer and so that might result in only a 3-degree loss. Unless the sensor is located at the far end of the plumbing run, it can't know the actual temperature there.

    Since you know there is currently a 5-degree difference, the best 'calibration' you can do is simply set the water temperature 5-degrees higher than desired. If you later add pipe insulation and then find there is only a 2-degree difference, you can then reset the temperature setting for only 2-degrees higher than desired.
     
  7. plumber69

    plumber69 In the Trades

    Joined:
    Jun 20, 2014
    Location:
    Prince Rupert, British Columbia
    What's the point? you already calibrated it in your head. I would rather know temperature the unit is putting out.
     
  8. dradam

    dradam Member

    Joined:
    Sep 21, 2008
    Location:
    Washington, DC
    Yes, You are all correct-- it is calibrated in my head-- that said I was just curious if there were a setting where calibration could be adjusted. I would think that tested at the factory some calibration must be done.
    Thanks.
     
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