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Combi boiler losing small amount of pressure

Discussion in 'Plumbing and Central Heating' started by Marnhullman, 19 Jan 2011.

  1. Marnhullman

    Marnhullman

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    My Boulter Bouderas (now Worcester Bosch I think) combi boiler is normally pressurised to 1.5 bar. Over the last month it has lost 0.1 bar. Is this cause for concern or should I expect a small loss?

    I have a heated towel rail in a bathroom that was getting air in it so I fitted an automatic bleed valve which has solved that problem but I guess there could be a leak somewhere causing this? The towel rail is much taller than all the standard rads and is the last in the line - don't know if that is significant.

    A short while ago I moved a radiator in a bedroom and for the first time I used plastic push fit pipe. I didn't push it fully home the first time (didn't realise how hard you have to push) so got a real flood but I re-did all the joints and checked and re-checked and there was no evidence of any leaks.

    There was a small seepage on another rad valve joint so I tightened it up and seem to have fixed it.

    There is no obvious sign of leaks anywhere.

    Thanks for any advice.
     
  2. garethpa

    garethpa

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    it's could be the bleeding of the towel rail that is causing the pressure loss.
    Do you have any corrosion inhibitor in the central heating?
     
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  4. 45yearsagasman

    45yearsagasman

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    No where in your post did you say that you had recharged your system after the work you did on the rads?
     
  5. gingerbear

    gingerbear

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    cud be your pressure relief valve passing slightly on the boiler wen systems hot ! have a check of the pipe that goes outside and c if theres any water dripping or passing from the end.or it still cud be your auto air vent fitted to your bathroom rad. :)
     
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  7. Marnhullman

    Marnhullman

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    Thanks to all for advice.

    I did recharge the system after refitting the rad and added inhibitor. I thought the loss could be due to the rad with the automatic vent but not sure why it keeps getting air in it?

    Advice from another forum is that the loss is not significant but I should keep an eye on it to make sure it doesn't get any worse.

    From experience is it unusual to get a slight loss of pressure over time?
     
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