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Old 03-19-2011, 11:30 AM   #1
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Hot Water from Cold Valve

When I turn on the cold water, I got HOT water for a bit then it goes to normal. This happens in the bathroom faucet as well as the shower. It happens most times, but not necessarily 100% of the time.

The hot valve only provides HOT water eliminating the possibility of a reversed connection.

2011 34' Classic

Any ideas?
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Old 03-19-2011, 11:36 AM   #2
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It's possible the cold water line comes close to a heat source. When you are not using water the heat source warms the water in the line. When you turn on the tap the warm water runs through first.
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Old 03-19-2011, 12:41 PM   #3
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Good point. To test, I should be able to turn off the water heater, run water until there's no more hot water, then leave it a while and test again. If I get hot water through the cold valve, you're theory is correct. If I only get cold through both valves, then the answer is one of two things...either the hot water heater is the "source" heating the cold lines or your theory is not the cause. Would you agree?

I like your idea, but based on the temperature of the hot water coming from the cold valve, I don't think that's the cause. The water is almost as hot as the water directly from the hot valve of the faucet. Make sense?

Off to test...I'll post the results!
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Old 03-19-2011, 01:00 PM   #4
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Our '83 Excella does the same thing when the shower water is turned off at the shower head. When turned off at the head, both faucets are on, and I believe that the hot water bleeds back into the cold due to the hot water being under higher pressure from the heat. When turned back on at the shower head, we get a short blast of hot, then it goes back to whatever temp adjustment was made before the water was turned off at the head.

I don't know why this would happen at the sink as the mixing of hot and cold won't happen until both valves are turned on.
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Old 03-19-2011, 01:33 PM   #5
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TX,

This may be nothing more than the SOLAR heating effect on your supply hose.

If you have a 50' hose sitting in the direct sun light the first 50 feet of water entering your trailer can be very warm, almost as hot as your heater produces.

Once the 50' of warm water has been pushed through your system the water will return to cold, or normal.

Sergei
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Old 03-19-2011, 05:36 PM   #6
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TX,

This may be nothing more than the SOLAR heating effect on your supply hose.

If you have a 50' hose sitting in the direct sun light the first 50 feet of water entering your trailer can be very warm, almost as hot as your heater produces.

Once the 50' of warm water has been pushed through your system the water will return to cold, or normal.

Sergei
Hi, this was my first thought also.
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Old 03-19-2011, 07:15 PM   #7
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I wonder what happens if you leave the bypass valve open...
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Old 03-19-2011, 08:13 PM   #8
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Mojo - great profile pic!

Group - I empty the hot water heater as described. I just now tested and sure enough, I get cold, then a long stream of very hot. While it was still feeding hot through the cold valve of the faucet, I turned off the cold valve and turned on the hot valve...no hot water (or even warm for that matter).

That eliminates the theory that it's pressure from the hot water heater or the heat from the hot water heater causing the issue.

As for the solar theory...definitely has merit! I cut my hose custom to the length I need 'cause I'm a full timer. It just looks cleaner than 50' rolled up. To test the solar theory, I'm gonna leave the hot water heater off tonight and test again in the morning. That should be a good validation of the solar theory despite the expected fool moon tonight. Ha!

Results in the morning!
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Old 03-20-2011, 05:02 AM   #9
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If this only happens in the bathroom it can't be your supply hose.
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Old 03-20-2011, 06:59 AM   #10
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Quote:
Originally Posted by Naper
If this only happens in the bathroom it can't be your supply hose.
Why's that?
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Old 03-20-2011, 07:35 AM   #11
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The hose supplies water to all the taps. Therefor the kitchen tap would have the same issue as the bathroom. I think your water line(s) are routed close to something hot like the fridge, water heater, furnace. When the water sits in the line it's heated.
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Old 03-20-2011, 08:48 AM   #12
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The hose supplies water to all the taps. Therefor the kitchen tap would have the same issue as the bathroom. I think your water line(s) are routed close to something hot like the fridge, water heater, furnace. When the water sits in the line it's heated.
Duh...Good point! Maybe I wasn't as awake as I thought this morning.
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Old 03-20-2011, 09:00 AM   #13
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Morning results...

The bathroom, shower, and kitchen faucets provided hot water through the cold valve. Close the cold valve and turn on the hot valve and immediately get cold water (remember I left the hot water heater filled with cold water and turned off). Close the hot and turn the cold back on and it's back to hot water for a while then it goes cold.

So, solar heat is eliminated. Hot water heater ambient heat is eliminated. Hot water heater pressure allowing hot water to leak into cold line is eliminated.

It's gotta be the line is being heated by something in the walls. But what? I'm in a 34' so both bath & kitchen faucets along with the shower are on the street side while refrigerator is on the curb side. Microwave/convection wasn't used during the tests.

I wonder if it's an issue with my UV filter that I've got outside the trailer right by the site supply faucet. If that's the case, I should be able to allow time for the heating to occur and then open the valve for the auxiliary hose connection the AS has as part of the fresh water inlet setup, right?

Results in a few more hours.
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Old 03-20-2011, 09:08 AM   #14
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hippiefish,

Your first paragraph above perfectly describes the effect of solar heating on your outdoor supply hose.
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