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Old 10-04-2016, 01:34 PM   #1
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Hot water coming from cold faucet

Do you leave your water heater on the whole time you're camping? When I do that, I often get hot water from both faucets. Any ideas why?
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Old 10-04-2016, 02:23 PM   #2
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Depending on the faucet manufacturer there could be some crossover leakage, Another thing that happens, if your water hose is in the sun, it will heat the water in the hose.
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Old 10-04-2016, 02:39 PM   #3
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Depending on the faucet manufacturer there could be some crossover leakage, Another thing that happens, if your water hose is in the sun, it will heat the water in the hose.

X2

We leave our WH ON whenever we are camping (7 yrs FT it was ALWAYS on except for 5 hrs on travel day)

Except for a very short period when 1st opening cold side of closet faucet......otherwise NO hot from cold side

Water hose laying in sun.......hot to very warm water from cold side on all faucets (sinks/shower/toilet) until flow cooled hose down



Other than an issue with a faucet it is next to impossible to have hot from cold side except for short period of initial flow due to plumbing/ water heater design and flow pressures
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Old 10-04-2016, 02:51 PM   #4
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If it is hot and doesn't cool, check the valves at your outside shower(if you have one). My other half had used the outside shower to wash the dog and shut it off by using the valve at the handle/shower head. She left the valves open at faucet, allowing the hot to find way into the cold water side.
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Old 10-04-2016, 07:51 PM   #5
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Do you leave your water heater on the whole time you're camping? When I do that, I often get hot water from both faucets. Any ideas why?
We usually leave our water heater on. X2 on what the others have suggested, but you should definitely check the winterizing bypass valve at your water heater. The bypass valve should be closed for normal operation.

Roger
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Old 10-04-2016, 08:07 PM   #6
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If you are in a very sunny and warmer/hot location, it could just be the water in the fresh hose getting heated by the sun.

If you aren't in a very sunny and warmer/hot location, go to every single water valve of your trailer and make sure they are turned off. Then, go turn on the cold water faucet closest to your water heater and see if there is still warm or hot water.
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Old 10-05-2016, 12:58 PM   #7
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Thanks for the replies! I laugh at how simple your solutions are and kick myself for not thinking about the hose heating up in the sun. I will pay attention to that next time we go. It very well could be the outside shower too as my kids do not turn off the water, only the handle switch.

Thanks again!
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Old 10-05-2016, 12:59 PM   #8
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We usually leave our water heater on. X2 on what the others have suggested, but you should definitely check the winterizing bypass valve at your water heater. The bypass valve should be closed for normal operation.

Roger
I only have a TT, not an RV and didn't think TT's had a bypass valve. Am I mistaken?
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Old 10-05-2016, 01:46 PM   #9
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I only have a TT, not an RV and didn't think TT's had a bypass valve. Am I mistaken?
You are somewhat mistaken - many TTs have bypass valves. Certainly both of my Jaycos have had them. If you have a water heater, you do not want to get the antifreeze into the water heater, hence the bypass valve. And your symptoms could well be an open bypass valve, which would allow hot water to cross over into the cold water line.

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Old 10-05-2016, 09:57 PM   #10
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You are somewhat mistaken - many TTs have bypass valves. Certainly both of my Jaycos have had them. If you have a water heater, you do not want to get the antifreeze into the water heater, hence the bypass valve. And your symptoms could well be an open bypass valve, which would allow hot water to cross over into the cold water line.

Roger

Typically that condition (WH bypass open) results in COLD from Hot side of a faucet as the cold water pressure overcomes the hot out of a WH.

Same with a shower being shut off at handle vs hot/cold knobs.
End up with warm/cool water flowing vs hot due to cold water overcoming/mixing with hot.

Hot from the cold side of faucet would more likely be malfunction within that faucet or Hot water in supply line


Water (like electricity) flows along the path of least resistance
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Old 10-06-2016, 05:40 AM   #11
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Thanks for the replies! I laugh at how simple your solutions are and kick myself for not thinking about the hose heating up in the sun. I will pay attention to that next time we go. It very well could be the outside shower too as my kids do not turn off the water, only the handle switch.

Thanks again!
Don't kick yourself! You might get hurt! Actually, most RV problems have simple solutions. The systems are not complicated. Most RVers experience similar problems and learn over time. I have been RVing for a very loooooong and have probably experienced almost every problem that could happen. Most are simple, some are complicated...most fixes are free or inexpensive, but some are very expensive. I RV for pleasure and do not want to work on my coach all the time. My checkbook is my best tool. But I do carry almost every tool I own when we go.

One time we camped at a casino in Pahrump, NV. The campground very much resembled an old drive-in move theater. It was in the desert and it was very hot that day. We all took hot showers and never turned the water heater on. That's how warm the campground water was!
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Old 10-06-2016, 06:59 AM   #12
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Typically that condition (WH bypass open) results in COLD from Hot side of a faucet as the cold water pressure overcomes the hot out of a WH.

Same with a shower being shut off at handle vs hot/cold knobs.
End up with warm/cool water flowing vs hot due to cold water overcoming/mixing with hot.

Hot from the cold side of faucet would more likely be malfunction within that faucet or Hot water in supply line
I hear what you're saying, but it's worth a check. FWIW, my shower does this interesting thing. After you get the water temp adjusted, and then you turn off the switch on the shower head, hot water backfills the cold feed. When you turn the water back on, you get scalded. The longer you leave it off, the longer the hot lasts. I've heard similar experiences from other people. One person solved it by installing a check valve on his shower cold feed; I'm not going crazy over it.

We've also seen several people here in the forums in the past who have had interesting issues when their bypass valves are not set correctly.

Roger
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Old 10-06-2016, 07:33 PM   #13
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It very well could be the outside shower too as my kids do not turn off the water, only the handle switch.
The simplest explanation is the most likely one.
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