09:01PM | 07/12/01
Member Since: 07/12/01
2 lifetime posts
Now this is strange. I just bought a condo, which was built in about 1975 in Southern California. The problem is that, when I turn on the cold water on the tap, it may start out cold, but then will turn very hot for about 30-60 seconds, then go back to cold. Some of the faucets are the mixing kind (where one turns the handle to the desired temp) while others are the kind with seperate hot and cold valves. And they ALL do this. I called a plumber today, and he says that this is because of the mineral content in the water, which has caused the valves to become messed up, which is somehow supposed to cause the problem. I think he's wrong. That explaination makes no sense to me. I think that the hot and cold pipes must run too close to each other somewhere in the walls and maybe are touching each other somewhere.

Which leads to 2 questions: First, am I right, or is he right? And second, is there anyway to find out where the pipes may be touching, without opening up the (condo) walls and/or floors???

And I suppose there could be a third question: is there some other explaination that I havent' thought of???

Anyway, any advice would be appreciated. Thanks in advance.



03:38AM | 07/13/01
Member Since: 09/01/00
312 lifetime posts
Hi Scott,...I would tend to agree more with your evaluation as opposed to the plumbers since this is happening in all your cold lines.The building I manage has the same situation in certain apartments.The cold water lines,when idle,heat up in my boiler rm.When a tenant draws water,this warmed water needs to flush out.There is another possibility of a cross connection where you are actually getting hot water temporarily,but I doubt it.Try another plumber if it really annoys you.


04:29AM | 07/13/01
Member Since: 03/13/00
1675 lifetime posts
Does this also happen to the cold water for your washing machine? If so, that would seem to rule out the mixing type faucets.
If the problem is as you and Matches think, maybe it would help to insulate both the cold water pipes and the hot.
It would be interesting to know where the heat is coming from. Can you trace it?
One more thing -- does it happen year-round? That is, in both hot and cold weather?
How hot is "very hot"? Is it really hot or just warm? If it's really hot, then I don't think that the cold water pipe coming in contact with something else would cause the problem. Again, does the washing machine water have this problem? What about an outdoor spigot if you have one? Does it put out this hot water? Do neighbors in the same building have this problem?

[This message has been edited by rpxlpx (edited July 13, 2001).]

[This message has been edited by rpxlpx (edited July 13, 2001).]


06:29AM | 07/13/01
Member Since: 09/01/00
312 lifetime posts
I forgot another situation I've run into.If your cold water lines are "shared" and there is a vacant unit between you and your cold water source,the water in those idle lines may warm up and go to whomever draws water first.See if anyone else nearby has the same problem.


09:29AM | 08/19/01
Member Since: 08/18/01
16 lifetime posts
I would have to agree with the plumber who looked at your home, If your piping was to close to gether you would only get warm water until the line had run for a min or so. (similar to turning on a kitchen tap for a drink of cold water..). It sounds like what is happening is there is more pressure in your hot water lines, and when you run the cold, it is drawing hot through one of the mixing vales into your cold lines. I would repair or replace the mixing valves.


03:32PM | 11/17/01
Member Since: 11/16/01
301 lifetime posts
Dear Scott,
I would follow your H&CW lines to the source. I had one experience where some noodle soldered the hot and cold lines together. Not connected, but together. This situation would result in jeat transfer.


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