Result after lagging heating ducts

[benchmark]

Out of a little boredom i decided to find a project on the boat that i had been meaning to do for a long time. I ended up insulating the 75mm ducts from my eberspacher D4 plus . It is located in the engineroom and has about 4 meters of ducting in total with 2 x 'Y' branches to allow for air outlet to the cockpit, window/defroster and sleeping cabin.
For the lagging/ insulation i used Eberspachers own Maxi therm sleeves that are very easy to apply as you do not have to dismount anything of your current setup. The results are impressive to say the least. 107 deg C is the air temp at the first outlet to the cockpit floor and about 2 meters away at the last outlet in the cabin it is 90 deg C . A project maybe worth doing to optimise your heating as eberspacher claim the up to 40% heat loss can occur
In the ducting alone.

 

[matthewriches]

Deffo worth doing. Fitted pretty much as standard now as why wouldn’t you? I retrofitted to my own install as it wasn’t insulated when I bought the boat and the time it takes to get up to temperature is now is a dam sight quicker. Also doesn’t cut in on full power as often so not only saves on fuel but noise as well.

 

[[2574]]

I am currently located Loch Goil and enjoying the significant benefits of such insulation on a bright but chilly Scottish morning.

 

[davidej]

Out of a little boredom i decided to find a project on the boat that i had been meaning to do for a long time. I ended up insulating the 75mm ducts from my eberspacher D4 plus . It is located in the engineroom and has about 4 meters of ducting in total with 2 x 'Y' branches to allow for air outlet to the cockpit, window/defroster and sleeping cabin.
For the lagging/ insulation i used Eberspachers own Maxi therm sleeves that are very easy to apply as you do not have to dismount anything of your current setup. The results are impressive to say the least. 107 deg C is the air temp at the first outlet to the cockpit floor and about 2 meters away at the last outlet in the cabin it is 90 deg C . A project maybe worth doing to optimise your heating as eberspacher claim the up to 40% heat loss can occur
In the ducting alone.View attachment 73278

Are thos really degrees C?

If so you can get rid of the stove and boil kettles/ cook food at the outlets

 

[pvb]

Are thos really degrees C?

If so you can get rid of the stove and boil kettles/ cook food at the outlets

It does look rather a high temperature. For the Airtronic heater, Eberspacher say "the mean outflow temperature measured after the heater has been running about 10 minutes at approx. 30 cm from the outlet should not exceed 110°C (at an intake temperature of approx. 20°C)." So to have 106°C at the cabin outlet looks a bit excessive.

 

[ithet]

Never quite understood this lagging thing. If the heating ducts run through the interior of the boat then surely it does not matter if they loose energy into areas you want to heat anyway? Or do you just lag the dead spaces, across cockpit lockers and close to the hull?

 

[maby]

Never quite understood this lagging thing. If the heating ducts run through the interior of the boat then surely it does not matter if they loose energy into areas you want to heat anyway? Or do you just lag the dead spaces, across cockpit lockers and close to the hull?

I was going to say the same - I guess that the ducts do run close to the hull and you may lose a bit of heat into warming up the marina by a fraction of a degree.

 

[benchmark]

Are thos really degrees C?

Yes sir it is in degrees centigrade, i was surprised myself and i even the cross checked the laser thermometer by measuring the temp in my mouth which was 36.5 deg C ,If anyone wondered .
I can only report it as i see it. 107 degrees centigrade at the first outlet which is about 2meters from the eberspacher D4plus unit.

 

[Keith-i]

ISTR that you should not lag the first metre or so to avoid the duct overheating and presumably melting.

 

[benchmark]

Never quite understood this lagging thing. If the heating ducts run through the interior of the boat then surely it does not matter if they loose energy into areas you want to heat anyway? Or do you just lag the dead spaces, across cockpit lockers and close to the hull?

My ducting does not run through the cabin , it runs in the hull. Only the last 50 cm runs through a wardrobe before it opens up to the sleeping area. I lagged that bit too because the walls of the wardrobe are not insulated. The warmth on the lagging still is enough to keep the small wardrobe free from moisture.

 

[benchmark]

ISTR that you should not lag the first metre or so to avoid the duct overheating and presumably melting.

Yes I read that but I must confess that my lagging runs almost up to the unit , only about 5 cm is exposed. I have run it for about 45 mins now with no probs but if the overheat protection gets activated , I will expose more of the duct . So far , so good, bear in mind that my unit is about 10 yrs old so may not have the lower setting now required by CE regulations for today’s overheating breaker.