Hot water coming out of Cold faucet

In both upstairs and downstairs bathrooms, whenever we flush the toilets, and then immediately go to the sink to wash our hands, the water coming out of what is supposed to be the cold faucet is very hot. After about 30 seconds, it will go back to cold.
Recently, we had a flood in our upstairs when the black floating ball in the tank of our toilet broke while we were not home. 80 gallons were deposited below. When repairing the toilet, the plumber noted that there was hot water filling up our tank.
Does anyone have any ideas for these two things to be happening? I don't know if they are related or not, but I am open to suggestions. The plumber thought that the filter in the shower might need to be changed and could be causing the issue.
Thanks in advance,
Collins
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bbal123 wrote:

<SNIP>
Could be feedback from a water heater connection. But can also be caused by faulty Single-Handle faucets or by a washing machine inlet solenoid valve.
Try and isolate fixtures like these (byclosing shutoffs) and see if the problem disappears.
If not, then look for more complicated causes.
Jim
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Jim,
I replaced the filter in the shower handle yesterday, but it didn't do any good. I also turned off the water to the hot and cold on the washing machine but I still got the same response. I am leaning towards having an expert come out and examine.
Thanks, Collins
Speedy Jim wrote:

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bbal123 wrote:

Check to see if your toilet supply was plumbed to mix a little from the hot water supply in with the cold to prevent a tank full of cold water from sweating on the outside if the humidity is high.
It might have been done that way and has gone out of adjustment.
Though I'd more likely go with the suggestion that you see if the hot water filling the tank stays hot for a couple of minutes of flow by holding the flapper up by hand so the fill valve stays open and water keeps flowing in. That'll give you more to go on. If it stays hot continuously after the sink water cools down you've got more to look for.
I once ran into a toilet which must have been installed by a drunken worker. It WAS fed from a hot water supply line, and I guess no one noticed it until after they'd closed up the wall.
Something about your story bothers me though. Did your plumber explain how the hell 80 gallons of water "got deposited below" because the float ball broke? Isn't that just what the overflow tube in the tank is there to prevent?
Did the ball break off its arm and then manage to float around and end up covering the top of the overflow tube, thus blocking it off? That, or a badly clogged drain is about all I can think of which would cause that "water deposition" event to happen.
Jeff
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Jeffry Wisnia

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That brings up another situation. If a faucet is shutting off flow to the sink, but leaving an opening between the hot and cold chambers you could get a mix also. Since the toilet is on the same line to the bathroom, it may be getting a dose of the hot water. That situation came up here a few months back.
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Jeffry,
Thanks for the response. I too was very skeptical of the overflow tube not catching the water. I have been told that some plumbers will increase the water flow into the tank to make it fill up quickly, but when they do that, it exceeds the capacity of the overflow tube. Of course, your two causes might be to blame as well. An engineering firm now has our toilet and is preparing a report for the insurance company. I will say that the exact same thing happened down the street to a family which had the same builder and the same plumber as a subcontractor. I am hopeful that something might come out of subrogation.
Collins
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How can I check to see if the toilet supply was plumbed to mix a little from the hot water supply ? What do I look for?
Thanks, collins
Jeff Wisnia wrote:

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bbal123 wrote:

Something like this:
http://www.pppinc.net/asvk.htm
Installed like this:
http://tinyurl.com/dytg3
Jeff
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Jeffry Wisnia

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Jeff Wisnia wrote:

The install article/video used a different shape valve, but the principle is the same.
Jeff
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Jeffry Wisnia

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I have a similar situation but it's not a problem. The cold water line runs across the top of the main furnace duct in the basement. In the morning, the cold water will run hot and then cold. The same water has been sitting on the furnace duct all night and gets warm and that little segment of hot water moves through the pipe and out the faucet as soon as the water is turned on in the morning. Only happens in the winter when the furnace is going. ds

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bbal123 wrote:

I am guessing that someone set up a hot water recycle system in your home to allow you fast hot water without waiting for it to run for a while to get hot. It may be malfunctioning.
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If the pipes are in the ceiling the heat in the attic is causing the water sitting in the pipes to get hot. If there was a cross connection the water would stay hot not cool down. The same thing happens in my two upstairs bathrooms. Dose the water stay hot filling the toilet ? Pull the cover off the tank and check. I will bet it cools down.
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Will check...if it goes back to cool, do you think there is a problem which needs to be addressed...or just go with it?
Thanks, Collins
Sacramento Dave wrote:

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