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Gianonni Direct DHW experience needed.

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Mark Eatherton
Mark Eatherton Member Posts: 5,853
in THE MAIN WALL
Wallies,



I am dong a DHW project in an area with extremely hard water (20 grains). One of the proposed systems is a Gianonni based direct water heating boiler with appropriately sized storage. While I like the concept, and the manufacturer has assured me they have installations done in hard water conditions that are performing flawlessly, I'd really like some contractor feed back from the real world.



Anyone care to chime in?



How long has it been running?



What kind of water conditions (hardness, sodium or other minerals present?)



Thanks in advance.



ME

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Comments

  • Jim Godbout
    Jim Godbout Member Posts: 49
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    Some experience

    Hi Mark

    We stopped using gianonni some time ago due to some premature failures of heat exchangers

    We have some aggressive water in some areas of southern Maine including some public water systems which can create huge build ups on tankless style heaters requiring annual flushing

    Our solution has been to use high grade stainless tanks on all our DHW installs



    We find it to be a more sustainable solution

    Good luck

    Jim

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  • Mark Eatherton
    Mark Eatherton Member Posts: 5,853
    edited November 2012
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    Thanks Jim G

    Anyone else?



    Also, Jim, were these actually being used as an open loop heater, running potable water through the boiler HXer or were they used with indirects (reverse or otherwise).



    TIA



    ME

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  • Ironman
    Ironman Member Posts: 7,376
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    Gianonni

    Mark,



    I've always had reservations about the Gianonni because of its narrow passageways and high head. A lot of heat transfer in a small area that works great until scaling or fouling enters the picture.



    I've never dealt with one on an open loop, but we recently replaced a two year old Munchkin Contender that was connected to 8000 ft. of non-barrier pex on a radiant floor (90% staple up). The Gio was leaking like a sprinkler. A job we were called in on that we're still trying to correct.



    I'd avoid it on an open loop like the plague.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • Jim Godbout
    Jim Godbout Member Posts: 49
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    Closed loop

    Hi Mark,

     they have all been closed loop boilers we had problems with

    I find they are not a very sustainable product

    here is one we show our clients to compare quality

    good luck

    jim

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  • Jim Godbout
    Jim Godbout Member Posts: 49
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    Closed loop

    Hi Mark,

     they have all been closed loop boilers we had problems with

    I find they are not a very sustainable product

    here is one we show our clients to compare quality

    good luck

    jim

    There was an error rendering this rich post.

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