1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Hot water venting into cold water tank

Discussion in 'Plumbing and Central Heating' started by Pepsi123, 14 Jan 2020.

  1. Pepsi123

    Pepsi123

    Joined:
    14 Jan 2020
    Messages:
    15
    Thanks Received:
    0
    Country:
    United Kingdom
    Help required

    I have started getting hot water venting water into my cold water tank in my loft. Because of this it is overflowing. I have recently had two jobs carried out (1) New overheat thermostat on my boiler (2) New mixer tap in kitchen. The temp of the rads seem hotter then have been. My HW cylinder is set at 55 degrees and I have a profile prima boiler that is set in 2. Has anyone any ideas ?
     
  2. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    63,067
    Thanks Received:
    3,332
    Location:
    Whale Island
    Country:
    Cook Islands
    Do you mean water is coming out of the vent pipe that hangs over your cold water tank?

    Or do you just mean the water level is rising and reaching the overflow outlet?

    is it the large tank or the small tank?

    Close both the service valves on your new mixer tap. What happens?
     
  3. Pepsi123

    Pepsi123

    Joined:
    14 Jan 2020
    Messages:
    15
    Thanks Received:
    0
    Country:
    United Kingdom
    Water is coming out of the pipe over the tank.
     
  4. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    63,067
    Thanks Received:
    3,332
    Location:
    Whale Island
    Country:
    Cook Islands
    the big tank or the small tank?
     
  5. Pepsi123

    Pepsi123

    Joined:
    14 Jan 2020
    Messages:
    15
    Thanks Received:
    0
    Country:
    United Kingdom
    I turned off the hot and cold water to the new mixer and water was still venting. The water venting is hot enough to create steam in the loft.
     
  6. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    63,067
    Thanks Received:
    3,332
    Location:
    Whale Island
    Country:
    Cook Islands
    Is the hot tapwater scaldingly hot?
     
  7. Pepsi123

    Pepsi123

    Joined:
    14 Jan 2020
    Messages:
    15
    Thanks Received:
    0
    Country:
    United Kingdom
    Water is venting into the big tank.
     
  8. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    63,067
    Thanks Received:
    3,332
    Location:
    Whale Island
    Country:
    Cook Islands
    Turn off the boiler. What happens?
     
  9. Sponsored Links
  10. Pepsi123

    Pepsi123

    Joined:
    14 Jan 2020
    Messages:
    15
    Thanks Received:
    0
    Country:
    United Kingdom
    The vent pipe going up to the loft is scalding hot
     
  11. Pepsi123

    Pepsi123

    Joined:
    14 Jan 2020
    Messages:
    15
    Thanks Received:
    0
    Country:
    United Kingdom
    With the boiler off there is no water venting into tank
     
  12. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    63,067
    Thanks Received:
    3,332
    Location:
    Whale Island
    Country:
    Cook Islands
    It's curious that water is coming from the vent pipe over the large tank. Is there a vent pipe over the small tank as well?

    Is the vented water pure or dirty?

    Is the boiler making unusual noises?
     
  13. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    63,067
    Thanks Received:
    3,332
    Location:
    Whale Island
    Country:
    Cook Islands
    Is the hot tapwater scaldingly hot?
     
  14. Pepsi123

    Pepsi123

    Joined:
    14 Jan 2020
    Messages:
    15
    Thanks Received:
    0
    Country:
    United Kingdom
    I have turned off hot water because tank overflows. When on hot water is hotter then usual.
     
  15. Pepsi123

    Pepsi123

    Joined:
    14 Jan 2020
    Messages:
    15
    Thanks Received:
    0
    Country:
    United Kingdom
    There is no water venting into smaller tank
     
  16. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    63,067
    Thanks Received:
    3,332
    Location:
    Whale Island
    Country:
    Cook Islands
    It sounds like your boiler is overheating. You say the boiler overheat stat was recently changed. That appears not to have done the trick. Perhaps there is a wiring problem. The overheat stat should only come into play if the operating temperature control is faulty. What do you know about the qualifications and experience of the person who did the repair?

    It is odd that it is venting into the large tank. Is the vented water pure or dirty? This is important

    Is there a vent pipe hanging over the small tank? Or are there two vent pipes hanging over the large tank?

    Hot water venting into the loft is dangerous, so you must turn your boiler off until the fault has been rectified.
     
Sponsored Links
Loading...

Share This Page