Reply
 
Thread Tools Display Modes
 
Old 04-06-2016, 12:12 PM   #1
Senior Member
 
City: PNW
Country: United States
Vessel Name: EXILE
Vessel Model: HANS CHRISTIAN TRAWLER
Join Date: Jan 2016
Posts: 127
Diesel heater exhaust

I just recently had a diesel heater installed (Planar 8D). Due to the design of my boat we were able to position the exhaust only 12" above the waterline on the aft starboard side. The exhaust tube does rise some as it passes through the lazarette which hopefully would deny water reaching the heater should we be hit hard by a large wave. Is anyone aware of any type of "flapper" which can be attached to an external exhaust (1.5" approx) to prevent water incursion?
Thank you for your responses.
re: Planar heater; so far so good. Forcefully pushes copious hot air.
__________________
Advertisement

petdoc4u is offline   Reply With Quote
Old 04-06-2016, 12:42 PM   #2
Guru
 
psneeld's Avatar
 
City: Avalon, NJ
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 15,883
how long is the exhaust tube and what is the diameter?


Wallas advised the rise is less important the longer the run.
__________________

psneeld is online now   Reply With Quote
Old 04-06-2016, 01:07 PM   #3
Guru
 
djmarchand's Avatar
 
City: East Greenwich, RI
Country: USA
Vessel Name: Bella
Vessel Model: Mainship Pilot 34
Join Date: Aug 2012
Posts: 2,878
Marine exhaust flaps like those made by Centek use a rubber flapper, which probably won't stand up to the higher temp of tyour heater exhaust. And 2" is the smallest that Centek makes.


Your problem is exactly like the exhaust from a lift muffler- so route it up in a loop as high as possible before dropping down to the outlet fitting.


I had a heater installed in a sailing cat with a similar distance above the waterline to the outlet. The exhaust was routed about a foot higher before it dropped down to the outlet.


David
djmarchand is offline   Reply With Quote
Old 04-06-2016, 01:24 PM   #4
TF Site Team
 
Larry M's Avatar
 
City: JAX, FL
Country: USA
Vessel Name: Hobo
Vessel Model: Krogen 42-120
Join Date: Nov 2008
Posts: 5,734
We had an Espar that exited Hobo about 8" above the water at the stern. We did the same as David mentioned: the exhaust run was much higher then the exhaust at the hull.

We also had a wood plug that we plugged the exhaust outlet from the outside when we weren't using it. I pulled an inline fuse for the unit and hung it on the wall so I wouldn't forget.
Larry M is online now   Reply With Quote
Old 04-06-2016, 04:29 PM   #5
RNL
Senior Member
 
RNL's Avatar
 
City: Sitka
Country: USA
Vessel Name: Rob n' Lee
Vessel Model: Kadey Krogen 42' #192
Join Date: Feb 2015
Posts: 108
Mine is a Webasto and exits low on the stern and when under way I plug it with a rubber expansion plug hung on lanyard above when not in use. Has worked fine for 18 years. I have heard caution from some about being aware with the side vented exhausts to be careful if ever rafted up to another boat due to the heat. Just in case?
RNL is offline   Reply With Quote
Old 04-06-2016, 04:31 PM   #6
RNL
Senior Member
 
RNL's Avatar
 
City: Sitka
Country: USA
Vessel Name: Rob n' Lee
Vessel Model: Kadey Krogen 42' #192
Join Date: Feb 2015
Posts: 108
Sorry, I read your post wrong and see that it is (aft) starboard like mine. Not on the side though I have seen some like that
RNL is offline   Reply With Quote
Old 04-06-2016, 05:38 PM   #7
Guru
 
twistedtree's Avatar
 
City: Gloucester, MA
Country: USA
Join Date: Jan 2013
Posts: 3,187
We have an expansion plug for our exhaust as described in a previous post. I think the only time I installed it was coming up the coast from So Cal. Obviously you can't run the heat with it installed, and need to remember to remove it before firing back up again.

You should be able to get an appropriately sized one from Sure Marine in Seattle.
__________________
www.MVTanglewood.com
twistedtree is offline   Reply With Quote
Old 04-06-2016, 07:11 PM   #8
Guru
 
City: Carefree, Arizona
Country: usa
Vessel Name: sunchaser V
Vessel Model: DeFever 48
Join Date: Apr 2008
Posts: 6,363
Like many I recommend a plug. When cruising our hydronic heater utilizes engine heat so diesel heater is off and plug can remain in place.
sunchaser is offline   Reply With Quote
Old 04-06-2016, 07:51 PM   #9
Veteran Member
 
raindr's Avatar
 
City: Olney,Mt/Anacortes,Wa
Country: USA
Vessel Name: Millie B
Vessel Model: 34 CHB Tricabin
Join Date: Oct 2011
Posts: 47
exhaust port

theplug sounds like a good idea, on my boat the PO installed the exhaust port for the espar 2" above the water line one of the first things I changed. Now 12" above waterline- couldnt place it higher I think it can be seen on my avatar
raindr is offline   Reply With Quote
Old 04-06-2016, 08:39 PM   #10
Guru
 
CaptTom's Avatar
 
City: Southern Maine
Country: USA
Vessel Name: Cygnus
Vessel Model: Prairie 36 Coastal Cruiser
Join Date: Dec 2012
Posts: 1,373
They sell some kind of draining "T" that can be added to the low spot in the exhaust. Seems like it might help with condensation; I suspect there would be a lot if you didn't run it long enough at high temperatures. I did get a plug for the outside vent, and did an elevated loop in the exhaust hose to it. No underway experience with it yet.
CaptTom is offline   Reply With Quote
Old 04-07-2016, 09:01 AM   #11
Senior Member
 
porman's Avatar
 
City: Duvall, Wa
Country: USA
Vessel Name: Beach Music II
Vessel Model: 2003 Mainship 430 Trawler
Join Date: Aug 2014
Posts: 250
Quote:
Originally Posted by RNL View Post
Mine is a Webasto and exits low on the stern and when under way I plug it with a rubber expansion plug hung on lanyard above when not in use. Has worked fine for 18 years. I have heard caution from some about being aware with the side vented exhausts to be careful if ever rafted up to another boat due to the heat. Just in case?
Be careful where you place your fenders also. We were walking up the dock in LaConner one evening when I smelled hot plastic. There was a boat with a fender in front of the heater exhaust and it was melting. The owners were very surprised. When rafting, the boats in our club plug in a stainless 90 deg. tube to direct the heat away from the boat beside them. Sure Marine sells them.
porman is offline   Reply With Quote
Old 04-07-2016, 08:22 PM   #12
Senior Member
 
City: PNW
Country: United States
Vessel Name: EXILE
Vessel Model: HANS CHRISTIAN TRAWLER
Join Date: Jan 2016
Posts: 127
Thanks for all your responses. I'll be looking for a plug I spect. Can someone be more specific regarding the "plug". I expect anything that plugs the hole is sufficient however are you using wood, rubber, dense foam or ??
Addtl info: length of exhaust run is over 10', diameter of exhaust tube is 42mm
petdoc4u is offline   Reply With Quote
Old 04-07-2016, 10:34 PM   #13
RNL
Senior Member
 
RNL's Avatar
 
City: Sitka
Country: USA
Vessel Name: Rob n' Lee
Vessel Model: Kadey Krogen 42' #192
Join Date: Feb 2015
Posts: 108
I have one thing similar to this - Shaw expansion plug , found on google search. I'm sure there are many that will suffice.
RNL is offline   Reply With Quote
Old 04-08-2016, 02:08 PM   #14
Guru
 
CaptTom's Avatar
 
City: Southern Maine
Country: USA
Vessel Name: Cygnus
Vessel Model: Prairie 36 Coastal Cruiser
Join Date: Dec 2012
Posts: 1,373
Quote:
Originally Posted by petdoc4u View Post
Can someone be more specific regarding the "plug".
$5.50 on Amazon:

CaptTom is offline   Reply With Quote
Old 04-08-2016, 02:21 PM   #15
Guru
 
City: Carefree, Arizona
Country: usa
Vessel Name: sunchaser V
Vessel Model: DeFever 48
Join Date: Apr 2008
Posts: 6,363
The plug required on many setups has to cover two holes, the outer and inner variety for instance. Exhaust and air intake plumbed together in same two compartment pipe.
sunchaser is offline   Reply With Quote
Old 04-11-2016, 12:55 PM   #16
Senior Member
 
City: PNW
Country: United States
Vessel Name: EXILE
Vessel Model: HANS CHRISTIAN TRAWLER
Join Date: Jan 2016
Posts: 127
Thank you to everyone who posted a reply. Ordered ($5.50) a motorcycle exhaust plug on Ebay. The exhaust fitting elbow is an interesting idea. My only concern is smacking it into a dock should a fender not be in place.
Cheers
petdoc4u is offline   Reply With Quote
Old 04-11-2016, 11:11 PM   #17
Senior Member
 
porman's Avatar
 
City: Duvall, Wa
Country: USA
Vessel Name: Beach Music II
Vessel Model: 2003 Mainship 430 Trawler
Join Date: Aug 2014
Posts: 250
Quote:
Originally Posted by petdoc4u View Post
Thank you to everyone who posted a reply. Ordered ($5.50) a motorcycle exhaust plug on Ebay. The exhaust fitting elbow is an interesting idea. My only concern is smacking it into a dock should a fender not be in place.
Cheers
The elbow would only get plugged in after you are rafted or docked. When under way it would be removed. The ones I have seen just slip in the exhaust pipe and are held in by friction. A safety lanyard is a good idea, just in case it slips out.
porman is offline   Reply With Quote
Old 04-12-2016, 10:19 PM   #18
Senior Member
 
City: Hampton Bays, N.Y.
Country: USA
Vessel Name: Grand Yankee
Vessel Model: 1981 49' Grand Banks Classic
Join Date: Oct 2007
Posts: 326
I had my pipe threaded so I could screw on a SS cap when not running and an extension to elbow pointing down to keep heat away from hull plus possible shout mark. The exhaust heat can blacken a dock face.
__________________

Ron T is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 06:00 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012