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| Water heater temp control? [message #134959] |
Sun, 17 July 2011 20:44  |
GMCNUSA
Messages: 283
Registered: August 2006
Location: Indianapolis, IN
Karma: 0
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Senior Member |
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The coach water heater gets too hot from engine coolant. Has any one found an automatic and simple control to keep water temp at safe level.
Larry Dilk
Indianapolis, IN
76 Eleganza II
Patterson 455,Turbo City TBI,
Just LOVE It!
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| Re: Water heater temp control? [message #134974 is a reply to message #134972] |
Sun, 17 July 2011 21:54  |
GMCNUSA
Messages: 283
Registered: August 2006
Location: Indianapolis, IN
Karma: 0
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| WD0AFQ wrote on Sun, 17 July 2011 22:39 |
Larry, can't you just mix cold with it to cool it down?
Dan
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Yes but the mixing process consumes some extra water that goes down drain. If not mixed it will burn the skin at close to 200 degrees and we don't always remember to mix it. We would like to have it at a safer temperature.
Larry Dilk
Indianapolis, IN
76 Eleganza II
Patterson 455,Turbo City TBI,
Just LOVE It!
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| Re: [GMCnet] Water heater temp control? [message #135001 is a reply to message #134975] |
Mon, 18 July 2011 08:41 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Netters!
Atwood makes a kit to control the temp of your hot water tank for
those of you that have engine heat with your HW tank. It was featured
in a tech articles in the GMC Motorhome News March 2005, Issue number
43, Page 6 and September 2009, Issue number 60, Page 5. It is called
a "Heat Exchanger Valve Kit" and contains a temp switch, 12 volt NC
solenoid and an NC vacuum operated coolant valve. Cinnabar has them
in stock for about $63 plus shipping. I have not found them elsewhere
as of yet, but you may be able find the kit locally or order it at one
of your RV supplier that handles Atwood service parts. There is no
part# on the package only the number under the bar code which is 6
92931 91975.
Regards,
J.R. Wright
GMC GreatLaker
78 Buskirk 30' Stretch
1975 Avion (Under Reconstruction)
Michigan
On Jul 17, 2011, at 11:00 PM, Hardie Johnson wrote:
>
>
> GMCNUSA wrote on Sun, 17 July 2011 21:44
>> The coach water heater gets too hot from engine coolant. Has any
>> one found an automatic and simple control to keep water temp at
>> safe level.
>
> Yes, they certainly do. Mine has tempering valve on it which mixes
> the input with the output. (I have been told that it is not a true
> tempering valve by someone who must have been a didactic plumber in
> a previous life.)
> In any event, if you search 'tempering valve' and 'mixing valve' you
> will find many options.
> --
> Hardie Johnson "Crashj"
> 1973 26 foot Glacier, White Thing
> Raleigh NC
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Water heater temp control? [message #135086 is a reply to message #135057] |
Mon, 18 July 2011 19:50 |
GMCNUSA
Messages: 283
Registered: August 2006
Location: Indianapolis, IN
Karma: 0
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Thanks to all who responded and I will pursue the options listed and see what looks the best/easiest/cheapest, probably only one of those will be met.
Larry Dilk
Indianapolis, IN
76 Eleganza II
Patterson 455,Turbo City TBI,
Just LOVE It!
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| Re: [GMCnet] Water heater temp control? [message #135106 is a reply to message #135060] |
Mon, 18 July 2011 20:58 |
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Who, in their right mind, heats hot water?
Byron
Rob Mueller wrote:
> Jim,
>
> Thanks, for some reason I thought it had to be near the hot water heater!
> DOUH!
>
> I'll install it in the lines that are up against the bulkhead where I have
> the two shutoff valves for the supply and return hoses to the hot water
> heater.
>
> Regards,
> Rob M.
> Sydney, Australia
> AUS '75 Avion-The Blue Streak TZE365V100428
> USA '75 Avion-Double Trouble TZE365V100426
>
>
> -----Original Message-----
> From: Jim Galbavy
>
> Rob,
>
> I have the GMC in Virginia closing on the house there.
> You can plumb it anywhere along the coolant supply hose to the water heater.
> The trick is how long do you want your vacum hose to be.
>
> jim
>
> _______________________________________________
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--
Byron Songer
Full-timing to enjoy the USA
Former owner but still an admirer
GMC paint schemes at -
http://www.songerconsulting.net
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| Re: [GMCnet] Water heater temp control? [message #135129 is a reply to message #135106] |
Tue, 19 July 2011 02:31 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Looks like:
Sears:
http://www.sears.com/shc/s/p_10153_12605_04232636000P?vName=Appliances&cName
=Water+Heaters&sName=View+All&sbf=Brand&sbv=Kenmore&subCatView=true&intShip=
5&sLevel=3
General Electric:
http://www.geappliances.com/products/water/water_heaters.htm
Camp Chef:
http://www.langtoninfo.co.uk/showitem.aspx?isbn=0033246210117&loc=AUD
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Byron Songer
Sent: Tuesday, 19 July 2011 11:59 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Water heater temp control?
Who, in their right mind, heats hot water?
Byron
Rob Mueller wrote:
> Jim,
>
> Thanks, for some reason I thought it had to be near the hot water heater!
> DOUH!
>
> I'll install it in the lines that are up against the bulkhead where I have
> the two shutoff valves for the supply and return hoses to the hot water
> heater.
>
> Regards,
> Rob M.
> Sydney, Australia
> AUS '75 Avion-The Blue Streak TZE365V100428
> USA '75 Avion-Double Trouble TZE365V100426
>
>
> -----Original Message-----
> From: Jim Galbavy
>
> Rob,
>
> I have the GMC in Virginia closing on the house there.
> You can plumb it anywhere along the coolant supply hose to the water
heater.
> The trick is how long do you want your vacum hose to be.
>
> jim
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Water heater temp control? [message #135253 is a reply to message #135086] |
Tue, 19 July 2011 19:52 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
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| GMCNUSA wrote on Mon, 18 July 2011 17:50 |
Thanks to all who responded and I will pursue the options listed and see what looks the best/easiest/cheapest, probably only one of those will be met.
|
Just something to think on...
The hotter the water in the water heater, the less hot water is needed to make your cold water warm enough to shower with. So, the hotter the water in the tank the larger the hot water tank will seem. (6 gallons of hot water isn't much.)
So...
For me, I am leaning more toward a "mixing valve" solution rather than limiting the temperature in the tank.
Of course a full replacement with an "on demand" system, would also remove the "overheated water" problem.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] Water heater temp control? [message #135264 is a reply to message #135253] |
Tue, 19 July 2011 20:54 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Mike,
The problem you run into is the engine cooling water can heat the water in
the water heater beyond the temperature relief valve setting and it spews
water overboard when you hook up to city water or turn on the pump when you
first stop. It continues to do so until the fresh water cools the water in
the water heater below the temperature relief valve setting.
This happened frequently on hot days in Double Trouble until we installed a
180° thermostat and the aluminum radiator.
I checked and found that the restrictor (~1/4" hole) IS in the manifold tap
off for the water heater.
BTW I figger'd that the heating loop in the water heater was a coil with
several loops. The PO of The Blue Streak left the 110vac element in the
Atwood 6 gallon water heater when he converted the coach to 240vac. I
replaced it with a 220vac element. While I had it out I noted that the
engine water heating loop was just a single pass, copper tube.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: Mike Miller
Just something to think on...
The hotter the water in the water heater, the less hot water is needed to
make your cold water warm enough to shower with. So, the hotter the water
in the tank the larger the hot water tank will seem. (6 gallons of hot
water isn't much.)
So...
For me, I am leaning more toward a "mixing valve" solution rather than
limiting the temperature in the tank.
Of course a full replacement with an "on demand" system, would also remove
the "overheated water" problem.
--
Mike
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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