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  1. #1
    Join Date
    Nov 2015
    Posts
    17

    Default Centre Cockpit, Moody etc... Diesel Heater, right or wrong location.

    Hi, I have a Webasto diesel heater fitted in the engine room under the centre cockpit on our Moody.
    The boats heater has been installed in that location from new for nearly 30 years (Now on 3rd heater unit).

    The exhaust pipe runs out under the floor boards and exits at the transom, with 2 hot air ducts fore and aft.

    I'm now being told this is complete wrong by 2 very well know firms / engineers on the south coast.
    Both have said they would rip it all out and start again, then going on to quote about £2k-£3k for the work.

    Forget the price, the guys gotta make a living, my issue is moving the heater to a new location as suggested since there's no room for 110mm warm air ducting to run from the lazzeret forward, but room for a 25mm exhaust to run aft.

    I'm more interested in where do other centre cockpit owners have their heaters installed and if it's in the engine room, where does the exhaust run / exit?

    Thanks

  2. #2
    Join Date
    Nov 2013
    Location
    Perth WA
    Posts
    2,435

    Default Re: Centre Cockpit, Moody etc... Diesel Heater, right or wrong location.

    Last edited by coopec; 09-11-19 at 05:43.

  3. #3
    Join Date
    Jan 2004
    Location
    Med
    Posts
    6,271

    Default Re: Centre Cockpit, Moody etc... Diesel Heater, right or wrong location.

    Can't help you with a heater but our AC unit Which also act as a heater is under our chart table in our 42 C Moody.
    You could try and post on the MOA if your a member.
    On the other hand if your works ok why both move it .
    Last edited by sailaboutvic; 09-11-19 at 06:42.
    Warning forumite dyslexia near by
    www.bluewatersailorcroatia.webs.com

  4. #4
    Join Date
    Aug 2009
    Location
    Scotland.
    Posts
    14,512

    Default Re: Centre Cockpit, Moody etc... Diesel Heater, right or wrong location.

    In my centre cockpit the heater is under the aft cabin bunk with exhaust on the quarter, high up and hot air trunking running along one side with outlet branches. Combustion air intake is from the same space via a baffle device as is heating air. The space is fitted with an automatic fire extinguisher with CO detector in the aft cabin. It has been checked twice now by 2 surveyors, pre purchase and 10 year survey with no comment, except change the plastic fuel pipe for copper pipe.

    Why do they say it is wrong?
    "'...contradictions .... are deliberate exercises in doublethink." Orwell from 1984

  5. #5
    Join Date
    May 2007
    Posts
    39,074

    Default Re: Centre Cockpit, Moody etc... Diesel Heater, right or wrong location.

    Quote Originally Posted by BlowingOldBoots View Post
    In my centre cockpit the heater is under the aft cabin bunk with exhaust on the quarter, high up and hot air trunking running along one side with outlet branches. Combustion air intake is from the same space via a baffle device as is heating air. The space is fitted with an automatic fire extinguisher with CO detector in the aft cabin. It has been checked twice now by 2 surveyors, pre purchase and 10 year survey with no comment, except change the plastic fuel pipe for copper pipe.

    Why do they say it is wrong?
    Firstly you should tell them that copper pipe is unsuitable for diesel.

    I imagine the issue with having the heater in the middle of the boat would be the length of the exhaust.
    This can cause two problems, firstly excess back pressure restricting air flow and secondly condensation.
    Most boat eberbasto installations are intended to exhaust the water created by combustion as steam. If the steam condenses, it may collect inthe exhaust hose and cause corrosion or even block gas flow.
    Condensate leaking into the bilge would be smelly and corrosive. Condensate running down the transom paintwork will stain.
    For this reason it's normal to lag the exhaust and keep the run as short as possible.

  6. #6
    Join Date
    May 2005
    Location
    Loch Snizort, Isle of Skye
    Posts
    4,960

    Default Re: Centre Cockpit, Moody etc... Diesel Heater, right or wrong location.

    On our CC Moody, the heater is in the engine room but the exhaust is on the outside of the cockpit coaming. Seems to work well, the only downside that I can think of is slightly more noise in the cockpit.
    Moody 39- Deb 33- Wayfarer- Wanderer

  7. #7
    Join Date
    Dec 2012
    Location
    Lympstone
    Posts
    1,181

    Default Re: Centre Cockpit, Moody etc... Diesel Heater, right or wrong location.

    Our Webasto (Sunbeam 44) is fixed to the hull at about head height in a locker behind the starboard mid ships shower. Lagged exhaust is about 0.5m long to highish on topsides. No gelcoat staining from exhaust but do need to check where fenders are before turning on. Seems to keep working.
    Fools know they are right.

  8. #8
    Join Date
    Jul 2002
    Location
    Farnham, Surrey
    Posts
    21,519

    Default Re: Centre Cockpit, Moody etc... Diesel Heater, right or wrong location.

    Our centre cockpit Westerley Sealord has the heater in the cockpit locker (It’s mounted high up on the f’wd bulkhead). The exhaust is short and comes out of the cockpit coaming.
    Semper aliud

  9. #9
    Join Date
    Aug 2010
    Location
    glasgow
    Posts
    1,032

    Default Re: Centre Cockpit, Moody etc... Diesel Heater, right or wrong location.

    On my Coaster 33 the heater is mounted on the stb side in the engine room with the exhaust on the stb side below the wheelhouse access point so the exhaust run is very short, approx 24 inches. I have never had any problems and it works great.

  10. #10
    Join Date
    Jun 2005
    Location
    South West
    Posts
    623

    Default Re: Centre Cockpit, Moody etc... Diesel Heater, right or wrong location.

    Quote Originally Posted by tinker13 View Post
    Hi, I have a Webasto diesel heater fitted in the engine room under the centre cockpit on our Moody.
    The boats heater has been installed in that location from new for nearly 30 years (Now on 3rd heater unit).

    The exhaust pipe runs out under the floor boards and exits at the transom, with 2 hot air ducts fore and aft.

    I'm now being told this is complete wrong by 2 very well know firms / engineers on the south coast.
    Both have said they would rip it all out and start again, then going on to quote about £2k-£3k for the work.

    Forget the price, the guys gotta make a living, my issue is moving the heater to a new location as suggested since there's no room for 110mm warm air ducting to run from the lazzeret forward, but room for a 25mm exhaust to run aft.

    I'm more interested in where do other centre cockpit owners have their heaters installed and if it's in the engine room, where does the exhaust run / exit?

    Thanks
    Hi,
    I don't have a centre cockpit but some experience of moving a heater and the ensuing ducting problems. Your post raises a few questions.
    The obvious question is what reasons did the two suppliers give for saying what you have is "completely wrong"?
    It sounds like they suggesting moving the heater position aft?
    If the heater is moved aft, you are most likely correct in stating the hot air duct going forward will have to increase in size (if any reasonable heat is to reach the fwd cabin). [My heater is at the stern and can only deliver ~25% of its output to the fwd cabin given the OEM ducts, without causing overheat at the heater hot air outlet - this heat is not really adequate].
    In your case, I'd need good hard engineering or safety reasons before moving the heater.
    Good luck
    Bob
    Trying not to extrapolate from zero

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