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  1. #1
    Join Date
    Jun 2001
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    Oban
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    780

    Default Plumbing in a Calorifier

    I am considering moving the calorifier so that the pipe run from calorifier to taps is shorter. Currently it's about 5.5m and takes about 10sec for hot water to come through. It feels like a long time, and wasteful, in use. The current location has the calorifier close to the engine but I figure the extra pipe run for cooling water from engine to calorifier will not present any problems.

    My current question is whether the vertical location of the calorifier is significant. My feeling is it should be low, probably its bottom level with the bottom of the cold water tank but I don't know if that is correct. What do people think? I've yet to investigate if there's anywhere with room near to the taps, at any level.

    Are there any other considerations that I should keep in mind?

    Background: the engine is Volvo 2030D, the boat Nordship 35.

    Derek

  2. #2
    Join Date
    Jun 2005
    Location
    Mid Devon
    Posts
    6,385

    Default Re: Plumbing in a Calorifier

    Calorifier should be below the level of the engine thermostat.
    Brexit: Taking back our freedom as a sovereign nation.

  3. #3
    Join Date
    May 2001
    Location
    UK East Coast
    Posts
    36,095

    Default Re: Plumbing in a Calorifier

    I'm afraid I think you'll be wasting your time and energy. If you could halve the distance you'll only save about half a litre of water. If you don't already have one, fit a thermostatic mixing valve to the calorifier. If you do move it, its height relative to the water tank is immaterial, as it works with pressurised water.

  4. #4
    Join Date
    May 2007
    Posts
    37,274

    Default Re: Plumbing in a Calorifier

    I found changing the plumbing to 10mm polypipe instead of 15mm made a big difference. Less wasted water and no leaks, as the old 15mm system was lots of elbow joints where the 10mm would simply bend. The reduction in flow at the shower was remarkably little.

  5. #5
    Join Date
    May 2001
    Location
    UK East Coast
    Posts
    36,095

    Default Re: Plumbing in a Calorifier

    Quote Originally Posted by PCUK View Post
    Calorifier should be below the level of the engine thermostat.
    Why? The calorifier in my last boat was above the engine and worked fine.

  6. #6
    Join Date
    Nov 2008
    Posts
    6,856

    Default Re: Plumbing in a Calorifier

    Things to consider:-
    As long as the calorifier is lower than the engine header tank, it will be fine, but depending on pipe runs, you may have to make a bleeding facility at the highest point. The flow through the calorifier depends on the ability of the engine circulating pump, so extending the pipework could be too much for the pump.

  7. #7
    Join Date
    May 2001
    Location
    North Wales, sailing Aegean Sea or Menai Strait
    Posts
    21,850

    Default Re: Plumbing in a Calorifier

    The calorifier in my motorsailer is at head height in the saloon, well over a metre above the top of the engine. I installed a float type snifter valve just above it but only bled it on first filling it. Otherwise it remains full of coolant even with the cap off the engine header tank.
    I did add a booster pump although I am not sure it was needed.
    Answers to some technical queries at new website http://coxeng.co.uk

  8. #8
    Join Date
    Jun 2005
    Location
    Mid Devon
    Posts
    6,385

    Default Re: Plumbing in a Calorifier

    Quote Originally Posted by pvb View Post
    Why? The calorifier in my last boat was above the engine and worked fine.
    Lucky you!
    Brexit: Taking back our freedom as a sovereign nation.

  9. #9
    Join Date
    Jun 2001
    Location
    Oban
    Posts
    780

    Default Re: Plumbing in a Calorifier

    Quote Originally Posted by pvb View Post
    If you don't already have one, fit a thermostatic mixing valve to the calorifier.
    What is the benefit of a thermostat? There was one but it only ever delivered tepid water, regardless of adjustment, so I removed it. Should I get a new one?

  10. #10
    Join Date
    May 2001
    Location
    UK East Coast
    Posts
    36,095

    Default Re: Plumbing in a Calorifier

    Quote Originally Posted by cpedw View Post
    What is the benefit of a thermostat? There was one but it only ever delivered tepid water, regardless of adjustment, so I removed it. Should I get a new one?
    The idea of a thermostatic mixer valve is that the water in the calorifier can get very hot - much hotter than you need it at the tap. So the mixer valve blends cold water with the hot water going to the tap, to reduce the temperature of the hot water. The result is that there's no chance of being scalded in the shower, no waste of water while you try to blend the temperature at the tap, and every litre of water at 80 degrees in the calorifier will provide a couple of litres of water at shower temperature. It sounds as if your mixer valve was faulty. I think they're well worth having.

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