Installing marine toilet and tank in 1987 25 sundancer?

Discussion in 'Classic Sea Rays' started by Fiddler2015, Jun 13, 2019.

  1. Fiddler2015

    Fiddler2015 New Member

    Jun 13, 2019
    87 sundander 25
    I'm looking to replace the porta potti with a marine toilet. Seems holding tank could fit next to fuel tank on starboard side. I've searched forums for a successful install, but have found nothing. Leaves me wondering if there's a good reason for not executing this plan.
    I appreciate any advise on this, Thanks.
  2. Stee6043

    Stee6043 Well-Known Member

    Jun 1, 2015
    West Michigan
    1997 Sundancer 400
    7.4L Gassers
    It's probably quite a lot of work and cashola to put one in after the fact.

    Off the top of my head I'd imagine you need the blackwater tank, vacuflush pump system, fresh water lines to the head, waste lines back to the pump, two new holes in the boat (one for pump out, one for the vent) and....maybe that's it?
  3. 370Dancer

    370Dancer Active Member

    Oct 2, 2006
    Florida - Alabama
    1998 370 Sundancer
    380hp MAG MPI Gen VI with V drives
    A marine toilet tends to have it's holding tank close to the throne, and low enough for a gravity feed. That means you'll be living over your waste tank. A vacuflush system, although more expensive, gives you the ability to move that stinky holding tank to your engine room. It also gives you a "home" experience without having to run a macerator right under the throne, pre-filling, pushing buttons, etc.
  4. Dave - M

    Dave - M Member

    Aug 29, 2018
    1990 270 Sundancer
    7.4 Mercruiser
    I am on my second boat with a marine head, no macerator, with the holding tank in the bilge. Both of mine have been manual flush, using raw water. I have no issues flushing back to the bilge. On this last boat, I spent $800 at dealer cost on a new potty, tank and lines. Seacock was already in as was the pumpout fitting and vent. If youre going to keep the boat for a while, it's a good investment in my opinion. A man deserves a decent throne to sit upon, even in the boat.

    The first boat, btw, was a bayliner 2355 with a 13 gallon tank. The 270 is 26 gallons I think.
  5. lawndoctor

    lawndoctor Active Member SILVER Sponsor GOLD Sponsor

    Jun 5, 2008
    Chesapeake Bay & Philadelphia
    2009 330 Sundancer & 2002 225 Weekender
    8.1L V-Drives & Bravo III 5.0L
    I put a vacuflush system on my 225 WE. The European version of the boat had it as a factory option so I knew it was feasible. I had a Dometic factory-recommended installer do it. We had to relocate the FW tank, but otherwise I just picked the models of the components and they put it together and installed it. Works great. Not cheap.
  6. boatman37

    boatman37 Well-Known Member

    Jun 6, 2015
    2006 Crownline 250CR. 5.7 Merc BIII
    Previous: 1986 Sea Ray 250 Sundancer. 260 Merc Alpha 1 Gen 1
    5.7 Merc BIII
    I have seen that era 250's with the holding tank in the bilge. We had a 1986 250 and there looked to be plenty of room on the starboard side. Our new Crowline 250 has the manual pump head. Not sure how it bolts to the floor but that is something you would have to figure out. But looking at mine it doesn't look too hard to add later if you wanted to.
  7. Fiddler2015

    Fiddler2015 New Member

    Jun 13, 2019
    87 sundander 25
  8. Fiddler2015

    Fiddler2015 New Member

    Jun 13, 2019
    87 sundander 25
    Thanks for all the input. Boat already has holes for pump out and vent, lacking only raw water. Playing with idea of electric "Five Oceans". My 30 gallon fresh water tank isn't used much (overnite trips mostly). Solves problem of additional hole in boat. Any thoughts? THANKS!!

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