Reply
 
Thread Tools Search this Thread Display Modes
 
Old 06-02-2018, 07:38 PM   #1
Member
 
captcarp's Avatar
 
City: Rye, NH
Country: US
Vessel Name: Navigator
Vessel Model: Island Gypsy/Europa 36
Join Date: Dec 2015
Posts: 24
Isotherm Basic water heater issue

I have an Isotherm Basic (Webasto) water heater that worked great last season. This year when I commissioned the boat the water output ( heater running off shore power overnight) was around 105F, yet the temperature of the brass fitting where temperature adjustment is located is around 140F (infrared reading). Also, today when I brought boat to mooring the engine coolant temp was 175F but out put from sinks and shower only 105F.

Any suggestions would be appreciated as were heading out on a 1 year trip and leaving next Saturday, June 9.

Thanks in advance fir your suggestions.
__________________
Advertisement

captcarp is offline   Reply With Quote
Old 06-02-2018, 07:48 PM   #2
TF Site Team
 
City: Brisbane
Country: Australia
Vessel Name: Now boatless - sold 6/2018
Vessel Model: Had a Clipper (CHB) 34
Join Date: Jun 2008
Posts: 7,245
Send a message via Skype™ to Peter B
Quote:
Originally Posted by captcarp View Post
I have an Isotherm Basic (Webasto) water heater that worked great last season. This year when I commissioned the boat the water output ( heater running off shore power overnight) was around 105F, yet the temperature of the brass fitting where temperature adjustment is located is around 140F (infrared reading). Also, today when I brought boat to mooring the engine coolant temp was 175F but out put from sinks and shower only 105F.

Any suggestions would be appreciated as were heading out on a 1 year trip and leaving next Saturday, June 9.

Thanks in advance fir your suggestions.
I have one of those, if it looks like this.
It sounds like you might be in for a gunk flush. By which I mean disconnecting the circuit that goes from engine coolant to heater and back, and connecting a flushing hose to it, and pushing water at some pressure through it. You might get a surprise at the algae type gunk that comes out. The performance should improve dramatically after that.
Attached Thumbnails
Click image for larger version

Name:	Image144.jpg
Views:	62
Size:	96.0 KB
ID:	76978  
__________________

__________________
Pete
Peter B is offline   Reply With Quote
Old 06-02-2018, 08:05 PM   #3
Guru
 
djmarchand's Avatar
 
City: Litchfield, Ct/Punta Gorda, Fl
Country: USA
Vessel Model: Atlas Pompano 23
Join Date: Aug 2012
Posts: 4,638
Is there a tempering valve in the system that limits the hot water to 105 deg by blending with cold? These can be adjusted.


David
djmarchand is offline   Reply With Quote
Old 06-03-2018, 07:02 AM   #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: 7,731
Quote:
Originally Posted by djmarchand View Post
Is there a tempering valve in the system that limits the hot water to 105 deg by blending with cold? These can be adjusted.

David
Or do you have out side shower? If the hot and cold valves are open, with the head is shut off, it will act as a tempering valve.
Larry M is offline   Reply With Quote
Old 06-03-2018, 07:46 AM   #5
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 19,336
Quote:
Originally Posted by djmarchand View Post
Is there a tempering valve in the system that limits the hot water to 105 deg by blending with cold? These can be adjusted.


David
this....if the tank temp is really 140 degrees based on the outlet fitting.

Larry has a good point with recircing shower units....
psneeld is offline   Reply With Quote
Old 06-03-2018, 12:26 PM   #6
Member
 
captcarp's Avatar
 
City: Rye, NH
Country: US
Vessel Name: Navigator
Vessel Model: Island Gypsy/Europa 36
Join Date: Dec 2015
Posts: 24
Thanks for responses. First of all I mistakenly stated that water heater was an Isotherm, its an Isotemp.
Peter B - good idea, I will attempt to flush engine feed/return
djmarchand - there is a tempering valve and it is cranked hard over to hot
Larry M - there is an outside shower and during commissioning I opened both hot and cold and and pressed shower end to get flowing but I never closed the hot and cold valves. I will try this as soon as I get back on board, this would be a nice easy fix if it works 🤞. Ill let you know.

Again, thanks to all. What a great forum and resource!
captcarp is offline   Reply With Quote
Old 06-03-2018, 12:30 PM   #7
Member
 
captcarp's Avatar
 
City: Rye, NH
Country: US
Vessel Name: Navigator
Vessel Model: Island Gypsy/Europa 36
Join Date: Dec 2015
Posts: 24
Attached are a couple of pics of water heaterClick image for larger version

Name:	IMG_0433.jpg
Views:	48
Size:	89.2 KB
ID:	77043Click image for larger version

Name:	IMG_0431.jpg
Views:	45
Size:	99.2 KB
ID:	77044Click image for larger version

Name:	IMG_0434.jpg
Views:	49
Size:	81.6 KB
ID:	77045
captcarp is offline   Reply With Quote
Old 06-03-2018, 02:55 PM   #8
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 19,336
Can't imagine it can be anything but the tempering valve if the inside is 140 degrees and the water downstream is much less.....may be a faulty valve.


Can you take it out of the system to troubleshoot?
psneeld is offline   Reply With Quote
Old 06-03-2018, 03:02 PM   #9
Guru
 
rochepoint's Avatar
 
City: Sidney BC
Country: Canada
Vessel Name: RochePoint
Vessel Model: 1985 Cheer Men PT38 Sedan
Join Date: Apr 2009
Posts: 1,445
Isn't the black valve on the left side of the the photo a tempering valve?
Attached Thumbnails
Click image for larger version

Name:	IMG_0433.jpg
Views:	35
Size:	92.2 KB
ID:	77049  
__________________
Cheers Mike Barge
RochePoint
Sidney, British Columbia
Yes, I have my "AnchorRight"
rochepoint is offline   Reply With Quote
Old 06-03-2018, 03:11 PM   #10
Guru
 
kchace's Avatar
 
City: Brookline, NH
Country: USA
Vessel Name: Blue Heaven
Vessel Model: Albin 43 classic double cabin, twin 135 Lehmans
Join Date: Sep 2013
Posts: 1,503
Quote:
Originally Posted by rochepoint View Post
Isn't the black valve on the left side of the the photo a tempering valve?
Yes. I have a similar model and the black valve identified is the "tempering" valve. It's job is to mix some cold water with the water coming out of the water heater to give you the hot water temp that you want. If your hot water at the faucet is too cool then try adjusting that valve first. (It may simply have been inadvertently turned during winterizing)

Ken
kchace is offline   Reply With Quote
Old 06-04-2018, 05:37 AM   #11
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 19,312
Tempering valves are great , but not as safe as an anti scald valve.

If there is not enough cold warer for the temperature desired the tempering valve will still pass scalding water.

An anti scald valve will simply shut off all the hot water.

For a retrofit using an engine coolant coil, try to purchase the anti scald valve.
FF is offline   Reply With Quote
Old 06-06-2018, 08:35 PM   #12
Member
 
captcarp's Avatar
 
City: Rye, NH
Country: US
Vessel Name: Navigator
Vessel Model: Island Gypsy/Europa 36
Join Date: Dec 2015
Posts: 24
Hi All,

Well got out to boat today and put the TF suggestions to work. First tried shutting off cockpit shower. IT WORKED! Temperature of water out of all faucets was 130 F. Also contacted Isotemp earlier this week, great response from them, and ordered a tempering valve which Ill put with my spares.

Thanks to all for the great suggestions and again what a great resource this forum.
__________________

captcarp is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 04:07 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012