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The Norfolk Broads Forum / Broads Boat Owners Q & A / Diesel heaters
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Posted By Discussion Topic: Diesel heaters

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Regulo
Sep-22-2020 @ 11:20 PM                           Permalink
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Mardles sometimes
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Another vote for the 4 separate outlets, Adi. The less restrictions to flow the better. Every junction will disrupt the air flow a little. But don't overlook the practicalities of running and insulating separate hoses the length of the boat. It might be more practical, depending on your proposed layout, to run larger hoses to a convenient split point. There's no hard and fast rule with these things.

Regards, Ray.

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ADI
Sep-24-2020 @ 8:46 PM                           Permalink
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I've just worked out the area of of the single outlet (A˜17671.46) and the 4 outlet version (A˜22167.08) there is a greater area with the 4 outlet version so should be less restriction for the heater.

Regards

Adrian  Michelle

Beck  Braydon and Mere.

ncsl
Sep-25-2020 @ 9:12 AM                           Permalink
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If you use the 4 way heater then would suggest you make sure that at least one outlet can NOT be turned off.
Safety reasons.


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Regulo
Sep-25-2020 @ 11:21 AM                           Permalink
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quote:"......
I've just worked out the area of of the single outlet (A˜17671.46) and the 4 outlet version (A˜22167.08) there is a greater area with the 4 outlet version so should be less restriction for the heater.
......."


That might not tell the whole story, ADI. One large outlet cowl may possibly restrict the direct flow from the heater less than the 4 outlet version. The 4 outlet one puts a large lump of plastic directly in the centre of the outlet from the heater. Again, who knows until you try it? By which time, it's too late!!!  Wink

Regards, Ray.

Whatever happens now, I'm blaming it on Brexit. Everyone else is!

Steve51
Sep-25-2020 @ 2:13 PM                           Permalink
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Also worth noting is that resistance will be far greater through the smaller ducts than the larger one. The air volume will decrease significantly over a greater distance too. If you were running one of those small ones the full length of a boat, I doubt you'd get much out of the end.

I did a fair bit of work on ducted air systems during my working life, although it was on installation rather than design, so I can't claim to be an expert.

Steve. CM1 and NR12

annville
Sep-27-2020 @ 10:57 AM                           Permalink
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Hi I dont think that there is a best way it depends on how is the best way to distribute the air and if each outlet is fixed or adjustable if the first outlet on a run is opened than this will reduce the flow to the others many have a 4inch flow from heater the tee off this is fine if heater is say at one end of boat but if in middle you will want two runs at the end of the day the heater will only produce a given flow you then divide it between out lets it is better to have to bigger size then to little. John

ruby
Sep-27-2020 @ 1:26 PM                           Permalink
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Not meaning to hi jack the  thread but has anyone tried inserting an inline electric fan (ie computer cooling fan) into a length of heating ducting to improve the flow to distant outlets ?

Can't see any obvious problems other than the heat of the air in the ducting melting the fan if plastic.

Any thoughts would be appreciated and might also help the op.

Graham

annville
Sep-27-2020 @ 4:56 PM                           Permalink
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Hi Graham It my cause the heater to shut off if the pressure at the heater fell below sencer setting you will always get less at the end as you would the beginning as temp of air drops the density will lower.idealy you want a large volume at a slow speed then no noise or drafts. John

ruby
Sep-28-2020 @ 11:53 AM                           Permalink
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Thanks John

I hadn't thought of that . I will experiment with care .

I hope it won't be a problem. Basically my problem is one of Angles. It is an ex hire boat and the builder installed  the heater for simplicity rather than effectiveness. Six inches after the outlet I have a splitter. One bit goes straight  to the saloon and rear cabin vents which get all the heat and air which is actually more than enough. The other bit goes into a 180 curve and then to a 12 foot length of drain pipe to go through the engine bay and into the  forecabin at which point there is no force or heat. Basically the air is being asked to go back on itself.

Shutting off the saloon vent gives a marginal improvement but not really effective, hence my idea of putting a small fan somewhere along the 12 foot drainpipe run.

Thanks again

Graham


annville
Sep-28-2020 @ 6:23 PM                           Permalink
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On my last boat i wrapped armerflex around the air distribution pipes held in place by tye wraps, you can buy this in sheets or camping sleeping mats do simmerler but beware the cheap ones are not fire resistant. John

angelfish
Sep-28-2020 @ 8:56 PM                           Permalink
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Hi just rejoined after a while away.
If the splitter is a 'T' join and the straight way does not go directly to the cabin turn it round so it does. If it is a 'Y' joint try a 't' joint as above.
As has been suggested lagging the pipe with increase the flow of heat, JPC, Brundall do some good but pricey lagging.
All of the above are cheaper than a new heater and the new heater will benefit from lagging anyhow.
paul

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