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My family and I live in an apartment. There is very hot water coming out of the cold water taps, and the toilet. I know it's summer so I expect some. In order to get even mildly cool water we have to flush the toilet, or let the water run for at least 20 minutes. The issue is just getting worse. I've put work orders into the landlord. The plumber said that this is normal. It is not. We have lived here for 3 years almost 4. This just started a few months ago and has gotten progressively worse.

After my work out I take cold showers because my apartment does not have A/C. I let the water run to purge the hot water from the pipes. In the shower we only get luke warm water now. There is no cold water on a single hand mixer. That is even when it is supposed to be on the cold area completely. After 15 minutes in the shower the water was still luke warm, no cold water coming through. While rinsing off I was burned on my inner thighs and genital area, 1st degree. I double checked the temperature gauge. Completely in the blue area. I need help. Please. I think this plumber's experience is working against him.

If anyone in our apartment building uses the water at all we finally get a bit of somewhat cold water (approx 80-90 deg F). We shouldn't get hotter water coming through when it is on the cold. As far as I can tell the boiler is dieing but I'm not sure. What can I do to help my landlord?

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    Are you on the top floor? Do your pipes come down from the ceiling/roof? – Harper Jul 21 '17 at 4:23
  • Where is this building: at least country but preferably city too? – Jim Stewart Jul 21 '17 at 10:08
  • What's the water pressure doing when this is happening? – ThreePhaseEel Jul 21 '17 at 11:36
  • Bottom floor, in the middle of the city. The water pressure stays stable. It just is always hot. – TJ Beazley Jul 26 '17 at 9:42
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I suggest that there is a mixing valve on the hot water output side of the boiler that is supposed to feed cold water into the hot water stream so that the temperature of the potable hot water is not too high. There is supposed to be a check valve to prevent hot water from flowing in the wrong direction into the cold water line, but it has failed and hot water is flowing into the cold water line. The check valve may be integral with the mixing valve or it may be separate but next to it. The correction will be to rebuild or replace either the thermostatic mixing valve or the check valve (if there is a separate one) or both.

See http://www.watts.com/pages/learnAbout/temperingValves.asp?catId=

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