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replaced boiler CH now barely warm

Discussion in 'Plumbing and Central Heating' started by zetland76, 24 Nov 2014.

  1. zetland76

    zetland76

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    My neighbour who lives in the same type of semi as me with the same type of CH system has just had his condensing boiler replaced (nothing else). His radiators are now barely warm. Is there something simple that the gas safe man has overlooked? He is now suggesting that he installs a two pipe system to replace the existing one pipe to fix the problem.
     
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  3. dominoman

    dominoman

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    Sounds like it could the pump isn't working. Perhaps an airlock.

    He should get the guy that fitted it back until it is working properly again. That is part of his job. He can't just replace it and then leave until he's sure everything is working as before.
     
  4. Agile

    Agile

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    There will be a CH temperature knob on the boiler. Is this turned up enough?

    Setting up a one pipe system does need some skills which many installers do not have.

    Tony
     
  5. Gasman77

    Gasman77

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    Feel free to enlighten the masses. I'm sure checking the boiler stat is not your sole suggestion, a less skilled installer could do that.....
     
  6. doitall

    doitall

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    Whatever it won't be anything to do with the one pipe system, if the boiler was connected correctly it will work just as well as the previous boiler.

    More likely he's fitted a rubbish boiler that isn't compatible or not set the parameters correctly.
     
  7. Agile

    Agile

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    Not necessarily.

    Some fit a bypass and leave it on a low setting and it raises the return temp to the boiler very quickly and causes it to burn for a minute and be off for five on an anticycle.

    There are several configurations of one pipe.

    Tony
     
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  9. jackthom

    jackthom

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    Some information about the boiler and a few pictures of the installation would make all the difference.
     
  10. doitall

    doitall

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    I said if, it's connected properly not bodged by some chancer thats trying to generate more work.

    And why would you want a by-pass, a one pipe loop is an open circuit, all the way around the property and back to the boiler.
     
  11. Agile

    Agile

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    Some installers see boiler instructions say a bypass is needed and fit one!

    Particularly when they have never seen a one pipe system before!
     
  12. doitall

    doitall

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    I believe some make/models of boiler are not suitable for a one pipe system
     
  13. Agile

    Agile

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    Many manufacturers will not agree that their boilers are suitable for one pipe systems, Worcester for example I think.

    Practically as long as the minimum flow can be achieved then most will work fine.

    But that can be a fine balance between ensuring enough flow through the boiler and getting enough flow through the system versus anti cycling delays, with 15 mm one pipe systems that can be a problem.

    As many were extreme budget systems with inadequate heat output, I usually fit a high output new parallel rad in the hall which overcomes those problems and increases heat output at the same time.

    Tony
     
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