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Thread: Tankless Water Heaters

  1. #1
    DIY Member foxhome01's Avatar
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    Default Tankless Water Heaters

    As mentioned in a previous post, we've been having these black specks that are hard to clean. The plumber just called back and advised that it's actually manganese. A temporary fix is to have the anode rod replaced and the tank cleaned (with bleach) But he said that since it's a mineral in the water that reacts with the heating process it will come back.

    He recommended a tankless water heater (or electronic heater) as a premanent fix to the removal of the black specks. These are very expensive, of course. Before we engage in considering this, I thought I'd ask for feedback from others as to whether or not this is a suitable recommendation and if it would in fact eliminate our problem.

    Also, does anyone know how long these anode rods last before we might see these black specks again? Want to determine if it's worth putting the money towards replacing for a tankless heater NOW vs. dealing with the temporary fix until we can truely budget for it.

    Lastly - any alternative options you would recommend?
    Last edited by foxhome01; 08-27-2008 at 08:34 AM.

  2. #2
    In the Trades Gary Swart's Avatar
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    Default

    I suggest you research the archives of this forum for comments and opinions about tankless water heaters.

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
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    Would swapping the existing anode with a different type resolve the problem? If heat preciptiates the mineral, you'll get the same thing in a tankless as you would in a tank. If it is a reaction with the anode in the tank, there are several other types available that may resolve that. Also, softening the water has other advantages and would be less expensive and provide other benefits at a lower cost than a tankless system.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    DIY Member foxhome01's Avatar
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    The plumber suggested replacing with an aluminum rod, but said that b/c this mineral exists in our water it would return.

    I have done a search and none of the posts talk to the tankless system eliminating the issue (black specks).

    I called the plumber back to ask about a filtration system and it's an option, but it's just as expensive.

  5. #5
    Master Plumber nhmaster's Avatar
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    The manganese will plug the tankless us pretty fast.

  6. #6
    Master Plumber Redwood's Avatar
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    The aluminum anode eliminates the problem I believe.

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