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Why is it that when you turn on the cold water, hot and sometimes even hot water flows?

Nick05 17586 11
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  • #1 19654859
    Nick05
    Level 2  
    I live in a brand new 7-unit building.
    I have two Hansgrohe taps with thermostats in the bathroom and ordinary mixer taps in the rest of the flat.
    Recently, however, I've had the problem that when I turn on the cold water, the water usually runs warm/hot for the first few seconds. This happens with both thermostatic and mixer taps. Sometimes hot water even comes from the toilet cistern.
    The connections from the boiler room are connected correctly (the hot water connection is hot when touched by hand and the cold water connection is cold).
    Do you have any suggestions?
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    #2 19654867
    stanislaw1954
    Level 43  
    brzozowskikamil wrote:
    Do you have any suggestions?
    As someone rummaged through the installation?
  • #3 19654894
    Nick05
    Level 2  
    No changes have been made to the installation.
    I am wondering if it is possible that, for example, the thermostat in the tap has broken due to its age. And now, even though the tap is turned off, hot water flows through the thermostat and into the cold water connection?
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    #4 19654919
    Robewit
    Level 26  
    I am betting on damage to one of the thermostat taps. If you have the opportunity, cut off the cold water supply to one then the other and check the effect.
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    #5 19654921
    misiek1111
    Level 36  
    Turn off the shut-off valves in front of that thermostat and you'll find out.
  • #6 19655015
    Nick05
    Level 2  
    Thank you for your answers. However, with these thermostatic taps I do not have shut-off valves, they are wall taps. In that case, instead of the thermostatic taps, I will install ordinary taps with valves and check the effect.
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    #7 19655245
    stanislaw1954
    Level 43  
    Nick05 wrote:
    In this situation, instead of thermostatic taps, I will install ordinary taps with taps and check the effect.
    Install one ordinary tap as a replacement and test. This will tell you which thermostatic mixer has failed.
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    #8 19655317
    Aleksander_01
    Level 43  
    There is definitely something wrong with the thermostats, but is it definitely a fault? In my opinion, it could still be a situation where the hot water has more pressure than the cold water, when opening another tap or bardash, the pressure of the cold water drops dramatically and the hot water 'overflows' from the thermostat.
    One thing is for sure, something is wrong with the thermostats.
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    #9 19655446
    misiek1111
    Level 36  
    As a quick aside, you can still set the thermostat temperature knob to minimum and see if the situation changes.
  • #10 19656190
    Nick05
    Level 2  
    Ok thank you for your replies, I will follow the suggestions given. I will give an answer from the tests carried out.
  • #11 19666171
    Zbychul
    Level 22  
    I had the same thing at my place - a flat in a block of flats , a hansgrohe thermostatic mixer and instead of hot water in the taps - lukewarm or cold water . Due to the difference in pressure, cold water entered the hot water pipes through the mixer. In general, the faucet is to blame and if it is under warranty, it should be reported. Even such a company starts to make mistakes. I temporarily installed one-way valves behind the water meters ( on the pecks ) without any problem and it helped for the time being.
  • #12 19667253
    piracik
    VIP Meritorious for electroda.pl  
    If you are close to the boiler room then the cause could be a lack of air in the diaphragm vessel, or a faulty non-return valve at the DHW cylinder.
    The heated water expands, increases in pressure and backs up into the cold water system.
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Topic summary

The discussion revolves around a plumbing issue in a new 7-unit building where cold water taps initially deliver warm or hot water. The user has Hansgrohe thermostatic taps in the bathroom and standard mixer taps elsewhere. Suggestions include checking for damage to the thermostatic taps, as a malfunction could allow hot water to flow into the cold water line. Other potential causes discussed include pressure differences between hot and cold water, leading to backflow, and issues with the boiler room's diaphragm vessel or non-return valve. Recommendations include replacing one thermostatic tap with a standard tap to diagnose the problem and adjusting the thermostat settings.
Summary generated by the language model.
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