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Hot water heater as buffer tank

Roland_18 Member Posts: 147
Hi All,

 If an electric hot water heater is used as a buffer tank, does one need to keep the anode rod in place? If so, why?

Thanks, Roland


  • Mark Eatherton
    Mark Eatherton Member Posts: 5,853
    In a true "closed loop" environment with good air elimination and no substantial make up...


    Steel requires the presence of oxygen in order to oxidize. Magnesium is the lesser of the two metals and it dissolves in the presence of oxygen first, protecting the unprotected portions of exposed steel tank. Without oxygen, oxidation is minimal.

    So, no, they are not necessary as long as you meet the criteria for a true closed loop system. Don't forget, non oxygen barrier tube makes it an open system...


    There was an error rendering this rich post.

  • Roland_18
    Roland_18 Member Posts: 147
    buffer tank

    Thanks Mark.
  • Brad White
    Brad White Member Posts: 2,398
    I agree with Mark

    (especially when he is right! :)

    I would only add, I see no harm in leaving the cathodic protection in place, even if a closed system.
    "If you do not know the answer, say, "I do not know the answer", and you will be correct!"

    -Ernie White, my Dad
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