Navien NPE-180A, loud humming

Discussion in 'Tankless Water Heater Forum' started by Jakester, Jan 31, 2020.

  1. Jakester

    Jakester Member

    Joined:
    Dec 21, 2017
    Location:
    Lancaster County, PA
    We had a Navien NPE-180A installed almost 5 years ago and recently it started making a loud humming / whining noise when the hot water is used, could the heat exchanger be doing this?

    Another question this time I would like to do the system flush myself and was wondering if there is any benefit of using cleaning vinegar which is 6% instead of the 5% while vinegar?
     
  2. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Interesting question. Not only stronger, but a bit cheaper. Should I use it when I sanitize my well some time? I already bought 2 gallons of food white vinegar for under $5 for the pair. Should you worry because it does not have food certifications? I have no answer for you, but I am glad that you brought this up.

    https://www.walmart.com/ip/Heinz-Cleaning-Vinegar-6-1-gal-Jugs/21570071

    I expect that instead of "Heinz Cleaning Vinegar 6 - 1 gal Jugs" the descriptions should read
    "Heinz Cleaning Vinegar 6% - 1 gal Jug"
     
    Last edited: Feb 5, 2020
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  4. Jakester

    Jakester Member

    Joined:
    Dec 21, 2017
    Location:
    Lancaster County, PA
    No one using cleaning vinegar?
     
  5. Jakester

    Jakester Member

    Joined:
    Dec 21, 2017
    Location:
    Lancaster County, PA
    Just wanted to update my experience. I ran 3 gallons of Heinz Cleaning Vinegar (6% acidity) through the system for 2 hours and now the water heater is back to being quiet just like when it was new.
     
    Terry and Reach4 like this.
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