Changing to a flush valve toilet

Discussion in 'Toilet Forum discussions' started by pcave, Apr 27, 2007.

  1. pcave

    pcave New Member

    Messages:
    5
    Location:
    British Columbia
    I'm trying to cheaply replace a basement bathroom's floor-mounted, wall-outlet toilet, but everywhere I ask tells me it is a special order that will cost upwards of $700 with a 4-6 week lead time. SO, in the interest of saving time and money, I'm considering switching to a commercial toilet with a flush valve (ie. no tank).

    My question is: How hard is it to plumb in a flush valve toilet? Do I just have to reroute the water supply from the existing tank shut-off valve to where the flush valve requires it? Or is larger pipe needed?

    Second question: There's a jog in the wall behind the toilet (ie. a shelf). Can you usually extend the piece of pipe that goes from the flush valve to the wall? Would that be a problem?

    Peter
  2. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    Flushometer valves typically spec a 1" water supply line. It's not that they need any higher pressure than you have available, but they need a very high instantaneous GPM. So, it may not work.
  3. Terry

    Terry Administrator Staff Member

    Messages:
    15,052
    Location:
    Bothell, Washington
    That's a lot more than I've been selling the Gerber floor mounted rear outlet toilet for, model 21-310, $399.00
    Or the American Standard Yorkville for $499.00
    These models use a Flushmate, and work with a 1/2" water supply.

    Takes me a couple of days to get these in the Seattle area.

    A commercial flushometer, with the 1" supply would need a new water meter, water service, and repiped 1" line to the toilet.
    Not a cheap way to go.

    specialist
    Last edited: Apr 27, 2007
  4. Peanut9199

    Peanut9199 Customer Service Manager Plumbing Wholesale

    Messages:
    875
    Location:
    Ontario, Canada
  5. Ikat

    Ikat New Member

    Messages:
    10
    Location:
    New York
    American Standard Flemington?

    Terry's report on "best low flush toilet" does not mention the American Standard Flemmington, which is only one of a few options for those of us with back outlet toilets. I've read that it is tricky to install, but nothing about its performance.

    The other options I have are Kohler Barrington, which is not comfort height, and Duravit Starck, but I can't find reviews on them and am leery about installing something behind the tile that isn't "proven."

    I don't know whether the Gerber rear exit comfort height has the problems being reported elsewhere on this site but that high a failure rate has pretty much put me off than brand.

    Suggestions?
  6. gusherb94

    gusherb94 Member

    Messages:
    124
    Location:
    chicago/nw IN
    An expansion tank could be plumbed in to get that "very high instantaneous GPM" without upsizing the houses water service. Pretty much that would be kinda like making a home made pressure assist toilet.
  7. dinkledoodle

    dinkledoodle New Member

    Messages:
    24
    Location:
    Clearwater, Florida
    Whenever I see "home made" and "toilet" in the same sentence, I worry...:D
  8. Terry

    Terry Administrator Staff Member

    Messages:
    15,052
    Location:
    Bothell, Washington
    You could pipe a one inch supply from an expansion tank.

    So what looks better, an expansion tank in the room, or an enclosed tank using a Flushmate.
    If it's about looks, being more commerical looking, you would need a place to set the expansion tank.
    And it would need to be an expansion tank with 1" threads.

    [​IMG]
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