How to Remove Water Heater From Engine Cooling Circuit? - SailNet Community
 2Likes
  • 1 Post By Delezynski
  • 1 Post By Alex W
 
LinkBack Thread Tools
post #1 of 9 Old 10-04-2013 Thread Starter
Junior Member
 
Dreaming's Avatar
 
Join Date: May 2013
Location: San Jose
Posts: 16
Thanks: 2
Thanked 1 Time in 1 Post
Rep Power: 0
 
How to Remove Water Heater From Engine Cooling Circuit?

Hey folks,

Due to a drip in the plumbing for the Transom shower that was left unattended for years the hot water heater has become exceptionally corroded.

In preparation for its replacement and because I am afraid of the water heater failing I would like to remove it from my Universal M25XPB Cooling circuit. I know that having a hot water heater hooked up to the engine is basically an optional add on so would I just remove the hoses on the engine side? Or Would I connect the hoses or run a short hose between the two valves?

As you can tell, I'm not all that experienced with working on engines but the owners manual only tells you how to hook up a water heater, not disconnect one.

Any and all help is appreciated. Thanks!

S/V "Harmony" 2000 Catalina 310 Hull #31
Dreaming is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 9 Old 10-04-2013
snake charmer, cat herder
 
zeehag's Avatar
 
Join Date: Nov 2008
Location: refitting a formosa in exotic tropical locations....
Posts: 1,805
Thanks: 8
Thanked 28 Times in 28 Posts
Rep Power: 7
 
Re: How to Remove Water Heater From Engine Cooling Circuit?

unfortunately that water heater would have done that without the drip. mine all did, so they were ditched. we simply undid the plumbing to and from it, making th ecold water deliver water thru circuit, and blocked off hot water lines.
have fun

you could always follow the trail of the install...backwards..i may have missed a step or two...


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

formosa 41, cruising tropics


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by zeehag; 10-04-2013 at 04:27 PM.
zeehag is offline  
Quote Quick Reply Share with Facebook
The Following User Says Thank You to zeehag For This Useful Post:
Dreaming (10-04-2013)
post #3 of 9 Old 10-04-2013
Senior Member
 
Delezynski's Avatar
 
Join Date: Sep 2013
Location: Currently in Az. and trailer to various places.
Posts: 520
Thanks: 12
Thanked 41 Times in 37 Posts
Rep Power: 2
 
Re: How to Remove Water Heater From Engine Cooling Circuit?

Dreaming,

Short reply....
Just run a short hose between the two valves on the engine, as you said. That should do it. Then remove the heater and close up the lines.

Greg
Ahoyhoy likes this.

Greg & Jill Delezynski
Nor'Sea 27, Guenevere
Home page -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Youtube page -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Delezynski is offline  
Quote Quick Reply Share with Facebook
post #4 of 9 Old 10-04-2013 Thread Starter
Junior Member
 
Dreaming's Avatar
 
Join Date: May 2013
Location: San Jose
Posts: 16
Thanks: 2
Thanked 1 Time in 1 Post
Rep Power: 0
 
Re: How to Remove Water Heater From Engine Cooling Circuit?

Quote:
Originally Posted by Delezynski View Post
Dreaming,

Short reply....
Just run a short hose between the two valves on the engine, as you said. That should do it. Then remove the heater and close up the lines.

Greg
I thought it was that simple but I just wanted to make sure. Thank you!

S/V "Harmony" 2000 Catalina 310 Hull #31
Dreaming is offline  
Quote Quick Reply Share with Facebook
post #5 of 9 Old 10-04-2013
no longer reading SailNet
 
Alex W's Avatar
 
Join Date: Oct 2012
Posts: 2,309
Thanks: 2
Thanked 140 Times in 133 Posts
Rep Power: 3
 
Re: How to Remove Water Heater From Engine Cooling Circuit?

The hardest part is pumping all of the water out of the heater so that it doesn't make a mess when you disconnect it.

Removing the hot water heater is a great upgrade. Saves dead weight, gets you back storage space, and removes an almost useless feature.
Dreaming likes this.

I'm no longer participating on SailNet.
Alex W is offline  
Quote Quick Reply Share with Facebook
post #6 of 9 Old 10-04-2013
Senior Member
 
BarryL's Avatar
 
Join Date: Aug 2003
Location: Long Island, NY
Posts: 1,825
Thanks: 4
Thanked 51 Times in 46 Posts
Rep Power: 13
 
Re: How to Remove Water Heater From Engine Cooling Circuit?

Hey,

When you disconnect the water lines from the engine to / from the heat exchanger, you may get some air in the lines. It may be difficult to bleed the air out. So be very careful to monitor the engine temperature for a few hours after you bypass the water heater. Make sure you know where the bleed screw is located (it should be near the thermostat) and you can open and close it. I would run the engine up to temperature, then open the bleed screw and vent any air in the system. Do this a few times. If you don't get air out, then you are good to go.

Personally, I like having hot water on board. I use it to wash the dishes, and will add some to the solar shower for washing up after swimming. My new boat has a shower in the transom, so the water heater will get even more use.

Lastly, a new water heater is not very expensive. If you can remove the old one you can install a new one. Just saying.

Barry

Barry Lenoble
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
BarryL is offline  
Quote Quick Reply Share with Facebook
post #7 of 9 Old 10-07-2013
Irrationally Exuberant
 
Join Date: Jul 2007
Location: Northern Virginia
Posts: 1,333
Thanks: 9
Thanked 6 Times in 6 Posts
Rep Power: 9
 
Re: How to Remove Water Heater From Engine Cooling Circuit?

Quote:
Originally Posted by Alex W View Post
Removing the hot water heater is a great upgrade. Saves dead weight, gets you back storage space, and removes an almost useless feature.
I guess usefulness is in the eye of the beholder. Hot water is one of those civilized bits that entices my better half to do more than just day sail with me, which makes it very useful. Nor am I immune to the delight of a hot water washup, or a warm shower on the transom after coming out of the water.

Tom K

2000 Beneteau 331
Northern Chesapeake Bay

Ambition is a poor excuse for not having enough sense to be lazy ~ Steven Wright
arf145 is offline  
Quote Quick Reply Share with Facebook
post #8 of 9 Old 10-07-2013
no longer reading SailNet
 
Alex W's Avatar
 
Join Date: Oct 2012
Posts: 2,309
Thanks: 2
Thanked 140 Times in 133 Posts
Rep Power: 3
 
Re: How to Remove Water Heater From Engine Cooling Circuit?

I did check with my wife before removing it. She was fine with it and forgot that we even had a hot water heater.

We don't use the engine very much. As a result the hot water heater rarely had hot water in it. The couple of times that I actually got hot water out of it were a complete surprise to me.

When cruising we do keep a solar shower out and on the foredeck. I use this when coming in from a swim. It's only hot enough to swim here if the sun is also out, so the fact that solar showers don't work for 9 months of the year is fine.

I'm no longer participating on SailNet.
Alex W is offline  
Quote Quick Reply Share with Facebook
post #9 of 9 Old 10-07-2013
Learning the HARD way...
 
eherlihy's Avatar
 
Join Date: Jan 2007
Location: Boston / Ft Myers Area
Posts: 4,088
Thanks: 159
Thanked 110 Times in 107 Posts
Rep Power: 9
 
Re: How to Remove Water Heater From Engine Cooling Circuit?

The water heater is plumbed to the engine in one of two ways. Either attached inline with the main heat exchanger and exhaust manifold, or as a hot water bypass at the thermostat. My water heater on my M25 was originally in line with the main heat exchanger. If yours is connected here, the simple fix would be to cut the 5/8" line from the heat exchanger, so that it is long enough to connect to the manifold.
Here is a pic showing the locations of the two heat exchanger hoses highlighted in red and yellow;


If yours is, as mine now is, connected to bypass the thermostat, the fix is easier, in that you need only cut the 3/8" line that runs from the top of the thermostat housing, and ensure that it is long enough to make it to the bottom of the thermostat housing.

Here is a pic with the 3/8" hose location highlighted;



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

USCG Licensed OUPV Captain, ASA 101/103/104/105/106/118 Instructor - Also certified in Marine Electrical Systems


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by eherlihy; 10-07-2013 at 07:08 PM.
eherlihy is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Refilling fresh water cooling circuit on a Volvo MD7B galliard Diesel 2 10-24-2010 07:22 AM
MD6A cooling water circuit.. groundhog Gear & Maintenance 0 09-11-2008 05:37 PM
Water Heater to Engine Hook-up Pub911 Gear & Maintenance 11 04-19-2008 10:55 PM
Hot water heater plumbed to genset & engine? jonlgauthier Gear & Maintenance 2 07-09-2007 02:01 PM
Connecting raw water cooling to water heater Northeaster Gear & Maintenance 18 04-28-2007 06:11 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome