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08-26-2014, 01:23 PM
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#1
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Senior Member
Join Date: Dec 2010
Posts: 1,645
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Water Temp Changes
When we boondock we want to conserve water. So we often turn the water flow off when using the shower. The idea is that you adjust the water temperature to comfortable once, then turn the valve on the handle off and turn the water back on when needed. That works well, except that when the water is turned back on again using the valve on the handle, the water temperature has changed from comfortable to way, way too hot. This has happened on my Jayco as well as another fifth wheel.
When both cold and hot water valves are on - and the valve on the handle is off - hot water can flow backwards into the cold water line, which means that when the valve on the handle is turned on you get a mix of hot water with hot water. The hot water seems to be under slightly higher pressure than the cold, so it can flow backwards into the cold line.
The solution for me was to install a check valve in the cold water line as close as possible to the shower head. It was fairly easy to do. The first picture below is "before" and the second is "after. The line sprayed with a bit of black paint is the cold line, the one needing the check valve that supplies the cold water shower valve. I had to modify the lines a bit to get the check valve as close as possible to the shower valve. Since my check valve is brass (and a bit heavy) I mounted the valve to the wall with a couple of 3/4" pipe support clamps.
__________________
There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2021 Chevy Duramax; Pullrite Superglide Hitch
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08-26-2014, 03:01 PM
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#2
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Senior Member
Join Date: Mar 2013
Location: CENTRAL NEW YORK
Posts: 984
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I might have to try that. Ours does the same thing. I learned to get out from under the water for the first few seconds as it gets pretty hot !!
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2013 33 RLDS
2004 Chevy Avalanche 2500 8.1
2019 Jeep Cherokee Limited 3.2
2016 CTS 4 2.0T
2001 Oldsmobile Aurora 4.0
2015 Chrysler 200C AWD
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08-26-2014, 03:05 PM
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#3
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Senior Member
Join Date: Jun 2011
Location: Kalamazoo, West Michigan
Posts: 1,817
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I'd try to find a slim in-line ball check valve that way positioning wouldn't be a concern. Looks like it works! Good job on the solution!!
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2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.
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08-27-2014, 06:16 AM
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#4
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Senior Member
Join Date: Jun 2010
Location: Saskatoon Sask Canada
Posts: 10,726
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Mine goes the other way and is way too cold.. but seems like a good idea..
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Seann
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 900watts of solar, Lithium batteries (400amp hour), 2000 watt (4000 surge) whole house inverter.
145days /2023 2022/151 2021[/COLOR]
93/2020,157/2019219/2018 206/2017,215/2016, 211/2015, 196/14, 247/13, 193/12
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08-27-2014, 06:18 AM
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#5
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Senior Member
Join Date: Sep 2010
Location: New York
Posts: 2,210
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Good mod. Just remember to run anitfreeze or air through it if you winterize as it will not back feed with the low points.
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2014 375 BHFS Eagle Premier
2014 Ram 3500 Longhorn DRW CC
6.7 CTD, Aisin, 4.10's
Yamaha EF3000iSEB
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08-27-2014, 04:17 PM
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#6
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Senior Member
Join Date: Dec 2012
Location: NW AR (God's Country)
Posts: 2,051
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Very nice mod!
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Skip
2012 Eagle Super Lite HT 26.5RKS
2005 GMC 2500 SLT HD D/A
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08-27-2014, 06:03 PM
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#7
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Senior Member
Join Date: Dec 2010
Posts: 1,645
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Thanks for the replies. It is really quite a relief to be able to use the shut off on the handle and not be blasted with hot water when turning that valve back on.
Seann45, seems like it would work with the cold water problem, too; I have read of this cold issue, but never found an explanation of what the cause is. But it sure seems like a check valve might be the cure.
I did find a sharkbite 1/2 inch check valve; it might be more a more convenient install for some.
__________________
There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2021 Chevy Duramax; Pullrite Superglide Hitch
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08-27-2014, 06:58 PM
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#8
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Senior Member
Join Date: Aug 2011
Location: Missouri City, The Republic of Texas
Posts: 5,063
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Happens in the 5th but I don't recall having the issue with the hybrid. My current solution is to let the shower "dribble" some rather than shutting it completely off.
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Cheers,
T_
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
-SOLD- 2012 X23B
-SOLD- 2003 Ford Expedition 5.4, Bilstein shocks
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09-01-2014, 07:07 AM
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#9
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Member
Join Date: Aug 2013
Location: Edmonton
Posts: 43
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I am permanently boondocking on a property I bought. A much simpler solution is to install a terrarium thermometer on the hot water tank with the display inside. Turn on the tank until the temperature is in the 97 to 105 F range, shut off tank. Go have your shower using the hot tap only. I keep a plastic dishpan in the tub to save the cold water from the lines for dishes. Saves your water and your propane!
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2012 Jayflight 28 BHS
2014 F150, 5.0 L, 3.55 axle
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09-01-2014, 07:36 AM
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#10
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Senior Member
Join Date: Jan 2014
Location: Aurora CO
Posts: 2,334
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Great idea. May have consider this one myself
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Jim & Kim from Colorado
2014 Eagle 30.5 RLS
2015 Dodge 3500HD SRW 6.7L
Click on my profile for Mods and notes
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09-01-2014, 07:41 AM
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#11
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Senior Member
Join Date: Dec 2010
Posts: 1,645
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I like re-purposing a device for RV use. As a terrarium remote thermometer, it costs about $10. As a special digital remote RV water tank temperature sensor, it would be $50. Great idea. Of course, heating the hot water to 97 to 105 does limit your supply somewhat.
__________________
There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2021 Chevy Duramax; Pullrite Superglide Hitch
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09-01-2014, 06:27 PM
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#12
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Member
Join Date: Aug 2013
Location: Edmonton
Posts: 43
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Boondocking isn't for long, hot showers. Navy shower, 2 Gallons, tops. A little harder for DW, she has long hair!
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2012 Jayflight 28 BHS
2014 F150, 5.0 L, 3.55 axle
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