Hot water problem - SailNet Community
 2Likes
  • 2 Post By wsmurdoch
 
LinkBack Thread Tools
post #1 of 7 Old 06-28-2014 Thread Starter
Junior Member
 
Join Date: Nov 2013
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Hot water problem

Hello all.
On my PSC 34, the engine is not heating the water in the hot water tank.
It will heat when connected to shore power. Due to some hull damage repairs, I am only getting the boat ready now and have not tested the water system until now. Last fall the engine/heat exchanger loop fluid was replaced, and the water tank drained and filled with non-toxic anti-freeze as used to winterize RV plumbing.
An 1.5 hour engine run yesterday yielded no hot water but the engine seems to run fine and not overheat.
I am trying to understand how this system works. I assume the engine heat exchange liquid is circulated through the hot water tank, not the heated waste water leaving the heat exchanger. Is fluid directed to the hot water tank before the thermostat opens? Is it possible there is an valve preventing flow to the water tank? Maybe there is a mechanical or electrical pump which I am not thinking of?

Thanks for any help or ideas on how to track down the problem.
Regards, David
dead_short is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 7 Old 06-28-2014
Me at 67
 
deniseO30's Avatar
 
Join Date: Nov 2006
Location: Bristol pa
Posts: 7,367
Thanks: 56
Thanked 147 Times in 136 Posts
Rep Power: 11
   
Re: Hot water problem

Most likely you have air in the hot water heat exchanger. It happens anytime the engine coolant is lowered or removed. Lucky for you that your engine doesn't overheat because of it. We just finished a new engine coolant water pump last night and I had to burp the water heater line twice.
Easy to tell. one line will be warm the other cold if the engine coolant is not flowing. It can be messy if you loosen hose clamps to let the air out.

But, if your engine is sea water cooled I wonder if it gets warm enough.

"Next best thing to not having a boat? The knowledge from having one!" Denise, Bristol PA, On Tidal Delaware River, Anchor Yacht Club.
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.

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

Last edited by deniseO30; 06-28-2014 at 10:48 AM.
deniseO30 is offline  
Quote Quick Reply Share with Facebook
post #3 of 7 Old 07-10-2014
Junior Member
 
Join Date: Feb 2009
Location: Liveaboard SV Yankee
Posts: 21
Thanks: 5
Thanked 2 Times in 2 Posts
Rep Power: 0
 
Question Re: Hot water problem

David, Check 'removal of the hot water heater' posted by Rain Dog last fall. Wolfgang
YankeePSC34 is offline  
Quote Quick Reply Share with Facebook
post #4 of 7 Old 07-10-2014
Senior Member
 
Join Date: Jan 2007
Location: The house is in Kingsport, TN. Boats are on Watauga Lake and in New Bern, NC
Posts: 348
Thanks: 4
Thanked 42 Times in 38 Posts
Rep Power: 10
 
Re: Hot water problem

On my 3HM35F the fresh water coolant supply and return hoses supplying the coil in the water heater are connected to the inlet and the outlet of the engine fresh water coolant pump. Water should flow to the water heater coil whether the thermostat is open or closed. My water heater is mounted in the port cockpit locker. The coolant supply hose rises up to the heater and the coolant return line decends from the heater making it possible to trap an air bubble in the water heater coil. The engine coolant may not be able to push an air bubble in the water heater back down to the engine. That would prevent the fresh water coolant from flowing through the water heater coil. To remove the air bubble that may be trapped in the water heater coil, Pacific Seacraft installed in the port cockpit locker a quarter turn ball valve in the return line from the water heater. Opening the valve with a bucket under the outlet will let the air bubble out. Any coolant caught in the bucket can be added back to the head tank after the system cools. To avoid the possibility of burns, this would best be done before the coolant is very hot.

Bill Murdoch
1988 PSC 34
Irish Eyes
34crealock and Hush34 like this.
wsmurdoch is offline  
Quote Quick Reply Share with Facebook
post #5 of 7 Old 07-12-2014
Not Finished Yet
 
RainDog's Avatar
 
Join Date: Jun 2009
Location: Varies
Posts: 794
Thanks: 24
Thanked 50 Times in 45 Posts
Rep Power: 8
 
Re: Hot water problem

Quote:
Originally Posted by YankeePSC34 View Post
David, Check 'removal of the hot water heater' posted by Rain Dog last fall. Wolfgang
If anyone wants my old water heater or surge tank you just have to pay shipping.



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

RainDog is offline  
Quote Quick Reply Share with Facebook
post #6 of 7 Old 08-31-2014
Junior Member
 
klshoreguy's Avatar
 
Join Date: Jun 2012
Location: New Jersey
Posts: 22
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: Hot water problem

My tank after 30 years died this morning along with 50 gallons of water that was in the FW tank. Alas, I am in the market. What type of tank? I cannot seem to locate your post on removal so please send that along if you can.

Keith
klshoreguy is offline  
Quote Quick Reply Share with Facebook
post #7 of 7 Old 08-31-2014
Jd1
Member
 
Join Date: Aug 2011
Location: Victoria, BC
Posts: 84
Thanks: 1
Thanked 7 Times in 7 Posts
Rep Power: 6
 
Re: Hot water problem

Although hot water can be made by pushing the coolant through the heat exchanger in the hot water tank, this is by no means the only method. In my boat the engine coolant circulates through a heat exchanger. A seperate loop pumps coolant through the secondary of the heat exchanger and then through the diesel hot water heater, the domestic hot water heater and all the heat exchanfgers for heating the boat. There is a seperate pump for that loop which has to be switxched on in order for the engine to heat the hot water. There are also isolation valves to shut portions of the system down.
In other words, you really need to trace your system to see find out exactly what is happening.
Jd1 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
Water Pump/Hot Water Heater/Breaker Trips DINKS14 Gear & Maintenance 5 03-10-2014 10:31 PM
Atlantic Marine Hot Water Tank and Fresh Water Winterization Dcneuro Gear & Maintenance 5 12-17-2012 11:03 AM
Raw water cooled issues and hot water davidpm Diesel 5 11-12-2009 05:11 PM
Hot Water Classic30 Gear & Maintenance 32 01-16-2009 04:13 AM
No Hot Water Duke 7184 Gear & Maintenance 9 08-04-2007 01:46 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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

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