Downstairs radiators cold?

Discussion in 'UK DIY' started by mark, Nov 17, 2003.

  1. mark

    mark Guest

    We have got a problem with the downstair radiators being cold.

    System is a standard boiler & tank, house is a two storey (the top story was
    added after the heating system however heating used to work ok)

    Upstairs gets warm, downstairs doesnt. If the rads are turned off upstairs
    then downstairs gets heat.

    british gas (three star cover) have been many time but cant solve it (fitted
    3 new pump and powerflushed the system at great expense). They have also
    said that it cant be the boiler or boiler size?

    Can anyone suggest what it can be?
    mark, Nov 17, 2003
    #1
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  2. mark

    David Hearn Guest

    "mark" <> wrote in message
    news:r94ub.2404$...
    > We have got a problem with the downstair radiators being cold.
    >
    > System is a standard boiler & tank, house is a two storey (the top story

    was
    > added after the heating system however heating used to work ok)
    >
    > Upstairs gets warm, downstairs doesnt. If the rads are turned off upstairs
    > then downstairs gets heat.
    >
    > british gas (three star cover) have been many time but cant solve it

    (fitted
    > 3 new pump and powerflushed the system at great expense). They have also
    > said that it cant be the boiler or boiler size?
    >
    > Can anyone suggest what it can be?


    I would say that the radiators are just not balanced. This is shown by
    closing off the upstairs radiators. The problem is that the upstairs
    radiators are plumbed in closers to the boiler and have their lockshield
    valves too far open. This is giving the hot water a nice short, easy route
    back to the boiler. The radiators downstairs are likely to be the furthest
    from the boiler and therefore offer the highest resistance. What you need
    to do is to adjust all the radiators' lockshield valves so that the ones
    closest the boiler are only just open (1/4 turn on our ones!) and the
    furthest ones are fully open.

    We had this problem and £20 for 2 clip on radiator thermometers and an hour
    or so and it was working fine after that. You can do it (roughly) without
    the thermometers if you want. Basically just close the lockshield (ie. not
    the one with a handle) valves on the upstairs radiators and then open them
    small amounts. Give them a little time to heat up and see if its
    acceptable. As I said, ours only required 1/4 turn from off, so don't think
    you need to give it much. Once you've started to get some sorted, you'll
    find the downstairs ones improving.

    There's quite a few FAQ's out there on how to balance the radiators.

    D
    David Hearn, Nov 17, 2003
    #2
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  3. mark

    Andy Hall Guest

    On Mon, 17 Nov 2003 13:36:23 GMT, "mark" <> wrote:

    >We have got a problem with the downstair radiators being cold.
    >
    >System is a standard boiler & tank, house is a two storey (the top story was
    >added after the heating system however heating used to work ok)
    >
    >Upstairs gets warm, downstairs doesnt. If the rads are turned off upstairs
    >then downstairs gets heat.
    >
    >british gas (three star cover) have been many time but cant solve it (fitted
    >3 new pump and powerflushed the system at great expense). They have also
    >said that it cant be the boiler or boiler size?
    >
    >Can anyone suggest what it can be?
    >

    Either they didn't do the power flushing properly and the downstairs
    radiators are full of sludge or the system is not balanced.

    I would test for the latter first by turning off all upstairs
    radiators and see if the downstairs ones start to warm up. Even turn
    off all the downstairs ones bar one. When you get one working,
    feel along the bottom centre area of the radiator. If you find a
    triangular cold area then there is a good chance that there is
    sludging.

    Balancing is easy to do but time consuming, which is why installers
    often don't do it and BG on a service contract are not likely to do
    much. There is info. in the group FAQ on balancing.


    ..andy

    To email, substitute .nospam with .gl
    Andy Hall, Nov 17, 2003
    #3
  4. mark

    mark Guest


    > Either they didn't do the power flushing properly and the downstairs
    > radiators are full of sludge or the system is not balanced.


    Someone did come to "balace" the rads, but still has not helped (unless they
    didnt do it right!)

    > I would test for the latter first by turning off all upstairs
    > radiators and see if the downstairs ones start to warm up.


    Yes they do.


    Even turn off all the downstairs ones bar one. When you get one working,
    > feel along the bottom centre area of the radiator. If you find a
    > triangular cold area then there is a good chance that there is
    > sludging.


    Will check this.
    >
    > Balancing is easy to do but time consuming, which is why installers
    > often don't do it and BG on a service contract are not likely to do
    > much. There is info. in the group FAQ on balancing.


    Will have a fiddle then. cant make it much worse!
    mark, Nov 17, 2003
    #4
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