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Hot air heater ducting

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George Isted View Drop Down
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Post Options Post Options   Quote George Isted Quote  Post ReplyReply Direct Link To This Post Topic: Hot air heater ducting
    Posted: 12 Nov 2014 at 9:38am
Good tip on the lagging, the exhaust will run past the back of the gas locker (that obviously doesn't want to get hot!) so I will look up Exowrap.
George Isted
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Keny View Drop Down
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Post Options Post Options   Quote Keny Quote  Post ReplyReply Direct Link To This Post Posted: 17 Nov 2014 at 1:13pm
Hello George
Mine is actually under the floor in the wet locker where it can warm up the clothing. Minimal ducting, easy to get at and very high gooseneck. Exhaust is through the hull and it works well if a little noisy.
Inlet/outlets are in the middle of the boat and one in foreward berth.
keny

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waratah912 View Drop Down
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Post Options Post Options   Quote waratah912 Quote  Post ReplyReply Direct Link To This Post Posted: 18 Nov 2014 at 10:13pm
For fuel supply, if you have a separate primary fuel filter, typically the CAV 296, it has a second filtered outlet and you can feed your heater with clean fuel. Just one less thing to go wrong if you ever get dirty fuel or diesel bug.
Paul Smith
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Post Options Post Options   Quote Richard Ritchie Quote  Post ReplyReply Direct Link To This Post Posted: 18 Nov 2014 at 11:27pm
Ideally have a separate stop cock in the fuel line to heater, since this tends to be snaking round locker edges so vulnerable.  Otherwise could loose engine through damage to this pipe. On Mikumi heater this can be done with a solenoid so off unless heater in use.
Richard Ritchie
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George Isted View Drop Down
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Post Options Post Options   Quote George Isted Quote  Post ReplyReply Direct Link To This Post Posted: 20 Nov 2014 at 10:38am
Originally posted by waratah912

For fuel supply, if you have a separate primary fuel filter, typically the CAV 296, it has a second filtered outlet and you can feed your heater with clean fuel. Just one less thing to go wrong if you ever get dirty fuel or diesel bug.


Thanks, not possible with my filter and I'm not convinced this is a 100% good idea as an air-leak in the supply to the heater could result in air being drawn into the main engine filter if there was any restriction (slight blockage in tank outlet) in the supply feed, unlikely but possible.   In the short term I'm putting a Tee into the bottom of the tank sight tube and will run off that.
George Isted
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Alan Dixon View Drop Down
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Post Options Post Options   Quote Alan Dixon Quote  Post ReplyReply Direct Link To This Post Posted: 14 Mar 2016 at 2:10pm
I am seriously considering fitting an heater and read with interest the various strategies for mounting and leading the ducting.
I favour the ducting on the Starboard side as being slightly easier, keeps heat away from the bins where I store food, and a little heat loss in the wet locker would not be a bad thing.
Has anyone used the area above the quarter berth to house a heater, it would give reasonable access to the stern for the exhaust, combustion air could be drawn from the side cubby hole.
any input / disadvantages dangers gratefully received
Alan
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George Isted View Drop Down
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Post Options Post Options   Quote George Isted Quote  Post ReplyReply Direct Link To This Post Posted: 14 Mar 2016 at 2:24pm
If you ever plan to use the quarter berth for sleeping I wouldn't put the heater above it.   It's not that noisy but would be intrusive if sleeping.

I have a Webasto 3500ST fitted with two outlets. Maybe I'm getting soft but I would not want to have a boat without a heater now. Toasty :-)
George Isted
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Post Options Post Options   Quote waratah912 Quote  Post ReplyReply Direct Link To This Post Posted: 14 Mar 2016 at 4:57pm
I wouldn't mount it above a berth, slight exhaust leak and you'll be sleeping forever.
Not sure there's a good answer - they are all a compromise, I mounted mine (D5W - wet) behind the engine, which makes it an absolute pig to maintain from the quarter berth, but keeps all of the hot stuff, fuel consumers and exhausts in one compartment.
I didn't want it in the cockpit locker as :
a) at that time the gas bottle was in there too
b) there's always the possibility of damage to the fuel pipe or damage from the exhaust / fire risk if the lagging becomes damaged and unseen.

Don't be tempted by the silencers for sale on eBay - they are only suitable for external use, the seems are only spot welded and leak exhaust gases.
Paul Smith
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Post Options Post Options   Quote caramorsimon Quote  Post ReplyReply Direct Link To This Post Posted: 21 Apr 2016 at 10:37pm
caramor has heater ducting on the starboard side.  
the ducting runs across the floor by the cockpit seacocks, through the engine bay and under the quarter berth. 
A corner taken out of the stbd engine access panel gets it under the quarter berth from where it runs forward.
 I could have planned a false floor in the outboard bin under the chart table, but I took it high over that space, forward behind the saloon seat back & then down into the underseat lockers. It meant reshaping one corner of the berth cushion & taking the corner out of the locker lid but I didn't want to lose space in the locker under the chart table.
I have a pair of outlets (each end of the stbd saloon berth) before it goes through the wet locker to the forepeak.
toasty boat. 
I remain paranoid about anything touching the hot exhaust hose though - even lagged its pretty hot..

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Post Options Post Options   Quote Alastair D Pugh Quote  Post ReplyReply Direct Link To This Post Posted: 22 Apr 2016 at 9:25am
My D2 exhaust is lagged and hidden inside a length of 60mm ducting.  It gets warm but not enough to melt plastic.  I replaced my exhaust again this winter.  It looked a bit corroded but ok until slight flexing caused it to break.
My exhaust outlet is about 9" below the top of the transom and I now plug it when I leave the boat 'cos I found it full of salt water.  Calmac in their wisdom now run smaller ferries on the Gourock/Dunoon run which kick up a very high short pitched wash that can actually wash up over the transom if the boat is lying stern to and obviously my swan neck isn't enough.    
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