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Old 02-09-2015, 03:33 AM   #1
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Hot water question.... 2013 Thor 4-Winds 31F

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I've checked and double checked to make sure that I have the valves all set correctly so that my hot water heater is fed cold water and has an open hot water outlet and these are working and we do have really hot water and cold water at both sinks and shower.

My issue/problem is that when in the shower, if one uses the cut-off valve at the shower head to conserve water while soaping up or shampooing, when the cut-0ff valve is released you get a surge of cold and then a surge of very hot water before the normal temperature you set is restored. QUESTION: Is this normal; do others have this problem?

I've also noticed that the galley sink/kitchen sink initially delivers cold water when the cold tap is opened but then has a brief period when the water gets noticeably warm before returning to pure cold. I can't imagine where that spurt of warm is coming from. QUESTION: Have any of you noticed a similar effect?
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Old 02-09-2015, 08:40 AM   #2
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Do you have an on-demand water heater? Some of those have issues with temperature vs. water flow rate, and could explain the shower issue. If you have a standard heater, I have no idea.

For the galley sink, i'm guessing there is something making the cold water line warm. It might be that the installers taped the hot/cold water lines together at some point, perhaps they are too close together where they go through a bulkhead, or some other source is heating the cold water line.
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Old 02-09-2015, 10:46 AM   #3
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It is a standard 10 gallon tank-type hot water heater, gas or 110 VAC. Yes the lines run close together so perhaps that's the issue with the kitchen sink. I'll put some insulation between the red and blue pipes and see if that solves the problem. Thank you for suggesting this easy fix.
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Old 02-09-2015, 12:42 PM   #4
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Every camper I've had has had the hot/cold shower issue (at least cold water coming out using the shower head shutoff).

Does a furnace vent hose run by the galley sink lines? That could easily heat up the water lines as well.
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Old 02-09-2015, 05:29 PM   #5
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Originally Posted by JDHoge View Post
It is a standard 10 gallon tank-type hot water heater, gas or 110 VAC. Yes the lines run close together so perhaps that's the issue with the kitchen sink. I'll put some insulation between the red and blue pipes and see if that solves the problem. Thank you for suggesting this easy fix.
Yea, its not like the manufacturer would have sprung for a $2 piece of insulation...
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Old 02-09-2015, 06:36 PM   #6
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I get that in my shower too, release that cut-off and you get a blast of cool, then blazing hot water.
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Old 02-09-2015, 09:04 PM   #7
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Yea, its not like the manufacturer would have sprung for a $2 piece of insulation...
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Old 02-10-2015, 01:41 PM   #8
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Inspection under sink revealed that the hot and cold lines had been taped and zip tied together. Severing those connections and placing a piece of cardboard between the lines solved the problem.
IMO, the shower has the same issue (although I can't get in there to make the correction). From my work to silence the rattling of the C & H lines behind the shower wall, I know that the two are separated from the floor up. So that accounts for the rush of cold. I guess that then if you've paused for 20 seconds or more to soap up or shampoo, the tightly tethered blue and red lines under the shower have heated up enough to give you that unpleasant blast of really hot water. No solution but to disassemble (but I'm not going that far).
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Old 02-10-2015, 02:26 PM   #9
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Glad you found the problem.
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Old 02-10-2015, 02:50 PM   #10
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yep, just formally added two items to my RV hit list
(projects to do some day when I have time..... yeah, like that's ever gonna happen )

1) recirculation valve for shower hot water line (if I can figure out a simple way to do it)
2) insulate the shower HW line
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Old 02-10-2015, 08:12 PM   #11
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You could combine the recirculation feature with a Truma on-demand hot water heater. They make one that is a retrofit into the existing hole the Atwood unit leaves.

There is a mode on the Truma that recirculates the water line, and the heater includes an auxiliary pump to accomplish this. However, you will have to find a way to plumb another water line from the hot water heater to the end of the line.
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Old 02-10-2015, 08:38 PM   #12
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honestly, I see no need in having an on demand heater
Sure it would be nice.....

but I have no problem with the recovery time, and I have no problem just switching the atwood on a few minutes before I want to shower.... leave it off most of the time.....
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