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Vertical radiator loosing heat

Discussion in 'Plumbing and Central Heating' started by creative101, 2 Nov 2019.

  1. creative101

    creative101

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    We have a vertical radiator in the loft. All the rads were balanced and the vertical radiator was heating up fine. But after about 7-10 days found it wasn’t heating up as well. When I bleed it no air comes out and after about 20 secs hot water finally starts coming out and the radiator warms up as normal. But after 7-10 days have the same problem. The only way of getting it to heat properly is to bleed it for about 20 secs and letting soMe water out. I know I shouldnt be doing this but don’t know what else to do to get the radiator working properly for more than a week.

    had this problem for about 2 years and thought it might be because of a old boiler not being able to cope with the extra radiators. But recently had a Intergas xclusive36 installed and the system was power flushed.

    the flow and returns are connected properly (there a red marker behind the radiator).

    the radiator next to it in the bathroom heats up no problem.

    Pls any suggestions?
     
    Last edited: 2 Nov 2019
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  3. Gasguru

    Gasguru

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    Where is the boiler and what's the pressure on the gauge set at with the rads cold?
     
  4. just pumps

    just pumps

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    Take it the bleed point on this rad is the highest point on the system?
     
  5. creative101

    creative101

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    boiler is on ground floor. Pressure is set to about 1.6
     
  6. creative101

    creative101

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    yes
     
  7. just pumps

    just pumps

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    Firstly I don`t do heating systems so wait for others to chip in however I have read about auto vents/ bleeds failing.
     
  8. martin hill

    martin hill

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    Hi There

    Whats the pumps head rating in the boiler. It might not be powerful enough to from ground floor to loft. You also "if a plumber can correct me" get reduced flow with lots of 90 degree elbow joints in the system i believe
     
  9. creative101

    creative101

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    Tried those but didn’t fix the problem
     
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  11. creative101

    creative101

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    not sure about the pump buts it’s a new Intergas xclusive36 boiler.
     
  12. John D v2.0

    John D v2.0

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    Nothing to do with the boiler rating, there must be air getting in. The pressure sounds ok unless you live in a 5 story house, but the pressure gauge could be faulty. do you know if there's inhibitor in the system?
    You say there's no air coming out but there wouldn't be much pressure at that height. How much does the water spray out, or is it just a trickle? If it's barely coming out and doesn't get close to 3 bar when hot you could try charging the system to 2 bar. But you may need a bigger expansion vessel otherwise.
     
  13. creative101

    creative101

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    Could this just be a case of fine tuning the balancing?

    The installer balanced the system when installing the new boiler recently. Should I turn down the other radiators more (they are all only 3/4 open)? And should the flow and return on the problem vertical radiator be completely open?
     
  14. creative101

    creative101

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    It does squirt out a lot of water.
    Inhibitor was put in. The new boiler was installed about 2 weeks ago.
     
  15. John D v2.0

    John D v2.0

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    Ah if the system was drained down recently it could just be the air settling out. i thought it was a long standing problem. It would usually collect in one radiator.
     
  16. creative101

    creative101

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    How long would this take. Generally, after bleeding or balancing the vertical heats up and then the problem starts after about 10 days.
    If the system wasn’t balanced properly, then would the problem always be there?
     
  17. John D v2.0

    John D v2.0

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    I can't see how any issue with balancing could cause air build up in a radiator.
     
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