Hot water by pass

Discussion in 'Winterizing' started by dvx216, Sep 27, 2017.

  1. dvx216

    dvx216 Well-Known Member SILVER Sponsor

    Feb 1, 2012
    orrville,ohio
    2000 310 sundancer 5.7 vdrives






















    n/a
    twin 5.7 300 Hp. V drives
    My 2000 310 Da uses Pex tubing for the water heater I would like to install a bypass my question is the lines udes on the heater SAE or metric
     
  2. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    It could be either one. Both metric and SAE were used at various times. The best way to know for sure is to look at them - size will be printed on the line. I would say probably metric, but look to be sure. From "my" experience, the red/blue pex lines (with push-in connectors) have always been metric. But that's not to say that they are ALL like that.
     
  3. PlayDate

    PlayDate Well-Known Member SILVER Sponsor

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    Are you trying to bypass the water heater? If so, most are set up to unscrew the inlet fitting and outlet fitting and then screw them together. That takes the heater out of the water flow.
     
  4. The Bill Collector

    The Bill Collector Well-Known Member SILVER Sponsor

    Jun 2, 2008
    Tacoma, WA
    450 Sundancer
    3126 Cat's
    My '98 has 15mm & 22mm pex red & blue
     
  5. rondds

    rondds Well-Known Member SILVER Sponsor

    Oct 3, 2006
    Jersey Shore
    2001 380DA
    Merc 8.1s (2008)...Hurth ZF 63 V-drives...WB 7.0 BCGD (2013), Garmin 8208 & 740 MFDs, GMR 24xHD dome
    If they're red and blue they're 15mm and you need SeaTech fittings. If they're grey they are 1/2" and you can use shark-bite connectors. In a model year 2000, they're probably red and blue.

    Pull the hoses out of the HWH and either join them with a union or build a u-shaped jig to bypass the HWH. Drain the HWH and use a shop vac to suck out any residual.
     
  6. wayne0

    wayne0 Member

    307
    May 4, 2014
    Newburyport, Ma.
    2000 340 Sundancer
    Twin 7.4 ltr.V-drives
    My 2000DA is 15mm. Red and blue.
     
  7. Capn Ron

    Capn Ron Member

    76
    Nov 2, 2006
    Lake Cumberland Ky.
    95 330 Sundancer
    454's v-drives
  8. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    The way I used to join mine together (before installing a permanent-type setup with valves) was to just use a short length (12") of garden hose to connect the red and blue together. Fits over the tubing perfectly - I had clamps, as well, but honestly, I don't even think I needed them.
     
  9. rondds

    rondds Well-Known Member SILVER Sponsor

    Oct 3, 2006
    Jersey Shore
    2001 380DA
    Merc 8.1s (2008)...Hurth ZF 63 V-drives...WB 7.0 BCGD (2013), Garmin 8208 & 740 MFDs, GMR 24xHD dome
    I had the camco setup too. It worked great for 2 seasons then the check valve failed. I threw it away and bypass it manually now as described above.
     
  10. rondds

    rondds Well-Known Member SILVER Sponsor

    Oct 3, 2006
    Jersey Shore
    2001 380DA
    Merc 8.1s (2008)...Hurth ZF 63 V-drives...WB 7.0 BCGD (2013), Garmin 8208 & 740 MFDs, GMR 24xHD dome
    Pinked everything today. Here's my hi-tek HWH bypass. Works like a charm.

    A couple of years ago I attached adapters to the red and blue water lines to convert to 1/2 NPT. The stainless feeds run to 1/2" brass nipples (one of which is the check valve type) on the tank. The 1/2" x 4" brass nipple serves as the bypass.
    [​IMG]
     
  11. dvx216

    dvx216 Well-Known Member SILVER Sponsor

    Feb 1, 2012
    orrville,ohio
    2000 310 sundancer 5.7 vdrives






















    n/a
    twin 5.7 300 Hp. V drives
    Up date on by pass of water heater turns on it was 15mm pex lines.My heater was replaced by PO and they installed some elbows which made it easy to just disconnect lines to heater and install a loop of pex between the elbows.
     
  12. scoflaw

    scoflaw Well-Known Member SILVER Sponsor

    Aug 10, 2011
    cape cod mass
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    If you use compressed air through the shore water hookup and blow your system out and don't use antifreeze, you don't need to bypass the HW heater.

    Hook up the air and open all valves, hot and cold, till nothing but air comes out. Open the drain valve on the HW heater and the toilet. Done
     
  13. streetglider

    streetglider New Member

    24
    Aug 14, 2017
    Ohio
    1994 Sea Ray 330 Express Cruiser
    5.7L
    QUICK CONNECT BYPASS.jpeg Because I am working on a new boat to me, and will spend the winter worrying I made a mistake, I would like to ask a question. I drained the freshwater tank then hooked up an air compressor to the city water and blew air through the lines by opening all of the faucets (hot and cold). I opened the drain valve on the water heater and drained it. I added about 8 gallons of Antifreeze and ran it through all the faucets again until I saw the pink. I an going to flush the toilet until I see pink too. I will leave all the faucets on over the winter.

    The quick disconnect fittings through me off a bit on the water heater and I was afraid to remove the fittings from the heater since it didn't look like they had ever been removed and the boat is 23 years old. Next fall, I intend to put together a bypass using the Whale hose and disconnects like in the picture I attached. If anyone sees a fault in my plan, please let me know as I am a bit OCD when it comes to doing my own work. I apologize for the long post.
     
  14. gerryb

    gerryb Well-Known Member TECHNICAL Contributor

    Oct 12, 2006
    Somers Point, NJ
    "On Vacation"
    2006 40 Sundancer
    E120 Radar & Garmin 5208
    QSB5.9 380 Cummins
    Thought I'd leave a picture of my set-up. Why the boat isn't set-up this way from the factory is one of the unanswerable mysteries.
     

    Attached Files:

  15. DaleM

    DaleM Member

    619
    Aug 5, 2009
    Mt Airy, MD
    340 Sundancer
    Twin 8.1 Horizons
    I literally disconnect the hot and cold lines from the HWH and connect them together with a plastic 3" gray union. That does the bypass. Then drain shop vac out what water comes out and that's all. I don't add pink to the HWH. Oh, open up the safety valve to drain that line too.

    There are some really nice looking bypass set ups on here! Mine is fugly in comparison :)
     
  16. rondds

    rondds Well-Known Member SILVER Sponsor

    Oct 3, 2006
    Jersey Shore
    2001 380DA
    Merc 8.1s (2008)...Hurth ZF 63 V-drives...WB 7.0 BCGD (2013), Garmin 8208 & 740 MFDs, GMR 24xHD dome
    I'm with you DaleM. Same simple deal but I'm fancy...I used brass! ;-)
    (see post #10 above)
     
  17. DaleM

    DaleM Member

    619
    Aug 5, 2009
    Mt Airy, MD
    340 Sundancer
    Twin 8.1 Horizons
    I might upgrade for the "bling" factor! :)
     
    rondds likes this.
  18. b_arrington

    b_arrington Active Member SILVER Sponsor

    542
    Feb 21, 2007
    Setauket, NY
    270 Amberjack (2006)
    AB Ventus 9 VL RIB
    350 Mag MPI Horizon w/ BIII
    1998 Envinrude 15 HP 2-stroke
    I do the same thing. I use a compressor to blow out the lines. Before bypassing the tank, I open the drain valve and blow as much water out of the tank as possible. The only 2 places I use pink is to flush the head, and to pour some in the water tank to ensure there's not residual water in there. I use the water pump to pull it through, but disconnect the water system from the pump outlet.
     
  19. Jack380AC

    Jack380AC Member

    854
    Jan 28, 2008
    West Chester, PA / North East, MD
    2000 380 Aft Cabin
    Twin 454 Mag MPI Horizon MerCruiser
    I just might have to invest in an air compressor. That would reduce the amount of pink I need to buy and eliminate the hassle of flushing and flushing and flushing the fresh water systems in the spring to get rid of that smell/taste!
     
  20. importmonkey

    importmonkey Opinionated Member SILVER Sponsor GOLD Sponsor

    764
    Jul 9, 2015
    Middle River, MD
    2007 44 Sundancer
    QSC 500s
    could the same be done with a shop vac to blow or suck three water out?
     

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