Stainless Steel Tank and Copper Plumbing

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by G. Mack, Feb 23, 2011.

  1. G. Mack

    G. Mack New Member

    Messages:
    1
    Location:
    Michigan
    New to the forum I am, and have a unique application. I have a heat pump (free heated water) and have a super insulated 170 gallon stainless pressure tank that I want to store heated water from H.P. and a future solar-tracking collector. This is a used water storage tank in great condition. It will have a large expansion tank and t/p relief valve on the unit.

    My questions are:
    1. What is the best connection between copper and stainless for corrosion-free longevity?
    Dielectric, brass, what? No galvanized, right?

    2. I am estimating water from solar to rise to 120+ degrees. With no real heating element in the tank, do I still need some kind of sacraficial element (rod) in the stainless tank?
  2. Terry

    Terry Administrator Staff Member

    Messages:
    14,775
    Location:
    Bothell, Washington
    You could use either Stainless or copper flex water heater connectors.
  3. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,814
    Location:
    New England
    Copper can be directly connected to SS without problems. The only time you'd get corrosion is if the thing wasn't put together properly and it leaks, then the water may leave mineral deposits when it evaporates.
  4. ilya

    ilya In the Trades

    Messages:
    105
    Location:
    Akron Ohio
    That sacrificial element is called an anode, and I don't see the need in a stainless tank.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,264
    Location:
    Cave Creek, Arizona
    The anode has NOTHING to do with whether there is an element in the tank or not. The tank material determines whether you need one, and as stainless tank should not require an anode.
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