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Post by NZL50505 on Oct 17, 2020 3:06:45 GMT
The 42DS we just sold had diesel heating installed (by us) to factory spec with the heating unit in the stbd aft transom area and 6 outlets through the boat stern to bow. The aft master cabin was (too) hot but by the time you got to the fwd heads (outlet 5) and the fwd cabin (outlet 6) the air coming out was far cooler and less forceful. To the extent that the fwd cabin could remain quite chilly whilst the aft and centre parts of the boat were toasty warm.
So for our new (to us) 50DS I’m wondering about best way to install diesel heating here? Especially given our master is now in the bow and I’m worried about it not getting warm enough in winter.
So I’ve wondered about installing the heater unit somewhere near midships but is that practical?
How are other 50 ft+ diesel heating systems set up and how well do they work?
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Post by Charlie-Bravo on Oct 17, 2020 8:17:30 GMT
I found, even on a much smaller boat, the same occurs but not to the same extent, I fitted heat vents witch close and the more I restrict the aft end vents the more heat I get at the pointy end whilst still keeping the rest of the boat warm.
You could install 2 heaters with one heating the master cabin, heat loss through the ductwork will donate some heat to the rest of the boat , and the micro control from Eber can run and control multiple heaters.
The transom is the better location with regard to keeping things quiet.
As you will have discovered on your previous install , duct routs and sizes affect things a lot, perhaps use the largest possible main duct to the master with much smaller ducts with longer lengths aft and midships .... the heated air will attempt to go the easy way.
Each heater has a maximum restriction allowed by ducting so by using 2 heaters you might overcome some of the limitations of 1 heater.
Hope your master becomes toasty
CB
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Post by NZL50505 on Oct 17, 2020 22:03:15 GMT
Yes a 53ft boat we looked at recently had 2 heaters but I’m not sure if they were mounted fore / aft or port / stbd. I was hoping to avoid having 2 units so I might look into a wet system which still uses diesel as the heating source but involves a matrix system to ensure more even heating throughout the boat. My only reservation is that these systems can be relatively inefficient - but I need to find out more.
Anyone here with a 50ft+ Jeanneau with heating installed by factory when new? What is that setup?
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Post by Trevor on Oct 18, 2020 4:09:45 GMT
Hello NZL50505,
I installed the heater on our 42DS many years ago. All outlets can be closed or restricted with the exception of the Saloon outlet. It is 90mm and must remain open by Webasto design. All others can be closed (including the aft cabin) allowing the heat to be directed where it is needed.
I figure you may be able to close off the areas you do not need and make that forward cabin toasty warm. The other advantage to having the heater in the aft section of the boat is you will avoid the jet engine noise it creates when it gets wound up.
Regards,
Trevor
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Post by element on Oct 18, 2020 6:32:39 GMT
The previous owner of our 39i has insulated the ducts to prevent that too much heat is lost on the way to the forecabin. Works excellent, air leaving the duct is still very warm.
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Post by NZL50505 on Oct 18, 2020 7:26:15 GMT
Yes my 42DS had exactly the same setup including heavy insulation lagging throughout. Yes if I shut all the other vents (except fixed saloon vent) the fwd vent had more oomph. But that’s not practical and I need a more even distribution throughout.
It sounds like a hydronic system might be worth exploring - anyone here got one?
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Post by zaphod on Oct 19, 2020 18:42:54 GMT
Our 39i gets plenty of hot air to the forward cabin yet it is still colder in there than the rest of the boat. The problem is not so much air flow as air circulation. Our heater was installed so that it is drawing 100% outside air, without any return air being drawn out of the occupied space. It is not a very efficient way to heat a space. If the door to the forward cabin is closed it just pressurizes the space, and the majority of the heat goes elsewhere in the boat. At some point I will improve it by adding return air ducts, but we usually sleep with the door open, and we like it cool when we sleep, so it is more about efficiency than comfort for us.
Hydronic heat would be a nice solution. It is much easier to run a couple of hoses where you want them than the big ducts. Another bonus with hydronic is that you can use it to heat your hot water too!
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Post by NZL50505 on Oct 19, 2020 19:41:40 GMT
Yes the more I research the more I think hydronic is the way to go.
Also, I’ve just remembered the boat has A/C throughout so it obviously already has ducting if sorts - I wonder if I can reuse that or if I need to run a totally separate system for heating?
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Post by Don Reaves on Oct 19, 2020 23:20:46 GMT
Can you reverse the A/C and use it to heat your boat? On shore power only, of course.
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Post by NZL50505 on Oct 20, 2020 1:12:04 GMT
Can you reverse the A/C and use it to heat your boat? On shore power only, of course. That's one of the wonderous things I will discover when I finally get to see my boat for the first time in about a month (hopefully)! Even if it does work reverse cycle on shore power or Genset I think I will still ultimately want a more efficient and less power hungry heating solution. But it might keep me going in the short-term. |
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Post by zaphod on Oct 20, 2020 3:01:25 GMT
Can you reverse the A/C and use it to heat your boat? On shore power only, of course. That's one of the wonderous things I will discover when I finally get to see my boat for the first time in about a month (hopefully)! Even if it does work reverse cycle on shore power or Genset I think I will still ultimately want a more efficient and less power hungry heating solution. But it might keep me going in the short-term. If you don't want the A/C unit you can pull it out, sell it, and repurchase the ductwork for a diesel heater or hydronic fan coils. |
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Post by NZL50505 on Oct 20, 2020 3:23:18 GMT
That's one of the wonderous things I will discover when I finally get to see my boat for the first time in about a month (hopefully)! Even if it does work reverse cycle on shore power or Genset I think I will still ultimately want a more efficient and less power hungry heating solution. But it might keep me going in the short-term. If you don't want the A/C unit you can pull it out, sell it, and repurchase the ductwork for a diesel heater or hydronic fan coils. Hah! I know it’s only New Zealand but even our summers can get warm enough to appreciate some A/C occasionally! 😊 |
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Post by jy51 on Oct 21, 2020 13:39:09 GMT
I have a 51 foot boat with reversible air conditioning, so thankfully, I don’t need to worry about diesel heating systems, however, I have spend many years sailing in cold climates where a heating system is essential.
Many hot climates experience short sharp, cold and windy winters and under these conditions many prefer to stay in the Marina. Rather than running noisy air conditioning or blown hot air diesel systems why not a few low voltage oil filled radiators. If your marine contract includes electricity this makes a lot of sense.
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Post by NZL50505 on Oct 21, 2020 21:25:36 GMT
Our climate is fully temperate so for 4-6 months of the year it can be quite cold & damp onboard - we like to continue using our boat all year on average 25-30 weekends pa. And many of the anchorages are beautifully calm & quiet in mid winter just chilly. So we def need a proper heating solution that can run at anchor whilst we sleep!
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Post by jy51 on Oct 22, 2020 8:36:22 GMT
Our climate is fully temperate so for 4-6 months of the year it can be quite cold & damp onboard - we like to continue using our boat all year on average 25-30 weekends pa. And many of the anchorages are beautifully calm & quiet in mid winter just chilly. So we def need a proper heating solution that can run at anchor whilst we sleep! This I can understand, we too used to enjoy winter sailing whilst based in the solent, UK, and at the time, we were somewhat younger. We had a ritual of driving down to the boat in Gosport a few days after Christmas day and then sailing to Newtown Creek, a nature reserve on the Isle of Wight, not a sole around only the wildlife for company. We had a full cockpit tent and an Eberspacher heater that ran on tick over, day and night, we have even been known to anchor there with snow on the ground. Once we moved down to the Mediterranean the Eberspacher, more or less became redundant, and was run up once a year just to make sure it was in working order. We also grew older and became spoilt by the clement climate and have changed to a boat more suited to the Mediterranean sunshine. No, I appreciate we are all different and my suggestion was simply meant for those that prefer not to venture out in those conditions and can benefit from shore power and a winter night in the pub! |
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Post by NZL50505 on Oct 22, 2020 21:17:38 GMT
Hah! Yes I grew up sailing in the Solent and know Newtown well - including the walk ashore to the pub. There’s nothing like the English mud creek with a country pub summer garden nearby or a roaring winter log fire with a tepid pint and a bag of Walkers crisps. And I still miss that stuff - but not enough to leave NZ 😊
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