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Annode rods

Techman
Techman Member Posts: 2,144
in THE MAIN WALL
Are there any type of domestic hot water heaters that do not require the use of annode rods? Oil ,gas electric, on demand, direct ,indirect,etc Thanks

Comments

  • Mark Eatherton
    Mark Eatherton Member Posts: 5,852
    Pretty much...

    any all stainless steel or reverse indirect type tanks DON'T have anode rods.



    ANode rods protect bear ferrous metals in conventional steel tanks. THey keep the incoming oxygen from attacking the mild steel by placing a lesser noble metal, i.e. magnesium or aluminum, in the path of the oxygen, so the oxygen eats them first.



    I have however seen anodes on the closed side of some heating boilers (Ajax).



    ME

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  • Constantin
    Constantin Member Posts: 3,796
    You could use active cathode protection

    Like the alaska pipeline and IIRC, at least one indirect had it as an option/feature/whatever.
  • TonyS
    TonyS Member Posts: 849
    Quite common on boats

    we usually use zinc plates but here is some info on active. http://www.boatcorrosion.com/aboutcorrosion.html
  • EricAune
    EricAune Member Posts: 432
    No Anode!

    Marathon Electric water heaters and storage tanks do not require (or have) them because they consist of an all plastic storage tank.  The heaters come with a lifetime warranty to the original owner and a fifteen year transferable to the second owner.



    Pretty nice!  I use them often for solar thermal, large mass radiant storage and domestic of course. 

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