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Hot Water Heater

Discussion in 'Ask A Catalina Owner' started by bigdogjerrys, Sep 13, 2017. Add this thread to a FAQ

  1. bigdogjerrys

    bigdogjerrys

    Joined Mar 12, 2015
    5 posts, 0 likes
    catalina 30
    US deerfield beach fl
    I have a 85 Cat 30 New M-25XPB engine. How does my water heater (in port cockpit Lazarette) get connected ?
     


  2. jssailem

    jssailem

    Joined Oct 22, 2014
    3,372 posts, 661 likes
    CAL 35 Cruiser
    US Salem, Moored Port Everett WA
    BI are you talking about connection from the heater to the plumbing system, or connection from the engine to the heat water while the engine is running?
     


  3. bigdogjerrys

    bigdogjerrys

    Joined Mar 12, 2015
    5 posts, 0 likes
    catalina 30
    US deerfield beach fl
    hi, yes connection from the engine to the water heater while the engine is running.
     


  4. jssailem

    jssailem

    Joined Oct 22, 2014
    3,372 posts, 661 likes
    CAL 35 Cruiser
    US Salem, Moored Port Everett WA
    Well first you need a heater that has 4 hose connections. Two are for leads to the engine. the other two are Cold in and Hot out to the fresh water plumbing.

    If you have a water heater so configured, then you need to run hoses from the engine on the side water out from the engine (hot side) to the Heater. Then run the out of Heater to your heat exchanger and back to engine.
     


  5. jviss

    jviss

    Joined Feb 5, 2004
    1,984 posts, 121 likes
    Tartan 3800
    US Westborough Westport, MA
    If there's a water heater and it's not connected, it's probably because it is broken, i.e., leaking from coolant to potable water side.
     


  6. bigdogjerrys

    bigdogjerrys

    Joined Mar 12, 2015
    5 posts, 0 likes
    catalina 30
    US deerfield beach fl
    The water heater was connected to the old engine and when replaced was not connected. With the new M25XPB it does not allow the same connections.
     


  7. jviss

    jviss

    Joined Feb 5, 2004
    1,984 posts, 121 likes
    Tartan 3800
    US Westborough Westport, MA
    I'm not following you. What do you mean "not allow the same connections?" The installer screwed up, or took a shortcut.
     


    bigdogjerrys likes this.
  8. kloudie1

    kloudie1

    Joined Nov 6, 2006
    7,370 posts, 300 likes
    Hunter 34
    US Mandeville Louisiana


  9. bigdogjerrys

    bigdogjerrys

    Joined Mar 12, 2015
    5 posts, 0 likes
    catalina 30
    US deerfield beach fl
    Do you have to hook hose to the thermostat at top or bottom with thermostat bypass? Replacing that hose or where do hose connections go on the engine. I have an optional high rise manifold on the engine.
     


    Last edited: Sep 13, 2017
  10. kloudie1

    kloudie1

    Joined Nov 6, 2006
    7,370 posts, 300 likes
    Hunter 34
    US Mandeville Louisiana
    Make it look like page 33 connections.. coolant leaves from below the thermostat and comes back to the coolant pump just above the shaft .. Search on "burping the water heater" or something like that on this site to get an idea of how to get all the air out..
     


    Last edited: Sep 13, 2017
  11. bigdogjerrys

    bigdogjerrys

    Joined Mar 12, 2015
    5 posts, 0 likes
    catalina 30
    US deerfield beach fl
    JVISS page 33 seems to be the answer, thanks and thanks to all for eplyong also.
     


  12. kloudie1

    kloudie1

    Joined Nov 6, 2006
    7,370 posts, 300 likes
    Hunter 34
    US Mandeville Louisiana
    Suggest you PM member Stu Jackson.. there is some great info on the Cat 34 site and maybe pictures of the connections.. I thought I had a shot of those connections, but they are hidden in my picture.. Good Luck, Big Dog and good luck with the connections.. Welcome aboard!
     


  13. MitchM

    MitchM

    Joined Jan 20, 2005
    476 posts, 35 likes
    Nauticat 321 pilothouse 32
    US Erie PA
    some tricks on a new water heater engine heater hoses install is 1/ have extra antifreeze ready because it will come out of the fittings near the thermostat block; 2/ attach heater supply hose onto the engine block side 1st, then fill the hose as full as possible w antifreeze, hold it high up to avoid drips, then quickly attach it onto the water heater fitting. do the same w/ second hose. this way, only the heater loop inside the water heater is full of air and you don't have much of a bleed job. fill the water heater with water, turn on the engine and the air in the water heater internal loop with usually bleed itself out.
     



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