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Discuss Very loud noise of rushing water in rads. in the Central Heating Forum area at

  1. Luna

    Luna New Member

    We recently moved to a rented property. Last Spring it was converted from oil to gas central heating. The property is a 1960'S chalet bungalow. The current boiler is made by Ideal and was new last Spring.

    The heating works and heats the house very well, but the noise is unbearable. The bedroom I am currently sitting in has a radiator that has the sound of rushing water that is so noisy it sounds like it's about to explode. It fluctuates too. This loud noise it replicated in other rads around the house but the bedroom is particularly bad.

    The landlords plumbers have been out 5 times to sort it. All the end up doing is turning the lockshield down on the rad so low that it bearly heats up even though the TRV is on 6. The only way to get heat in the rad is to open the lockshield and if it's not fully open its doesn't get very warm.

    The plumbers have:

    Bled the system several times.

    Flushed and put a treatment through the system.

    Changed a rad in another room which was not heating up properly and was making a terrible noise. The new rad is still very noisy.

    Turned down the pump on the boiler.

    Shut off the lockshield on the most offending radiator.

    Flushed the offending rad which had some very light yellow water and black fine dust stuff when the plumber took the water out but crystal clear water when flushed with a hose.

    The last plumber here said he feels it's possibly a fault with the boiler and as radiators start reaching their set heat and switching off, the boiler is not reducing the flow of water. But if this were the case would it at some point be silent? It isnt. It is a truly loud gushing sound. Pipes have also started knocking and we sometimes get whistling too.

    The managing agent says speak to the plumber, but they are now beginning to ignore us, promising to ring back and never do.

    They just seem to be putting a plaster on something without actually finding the cause.

    I know it's a long shot but would anyone have any idea what could be the cause of this? Whilst we currently have heat, this seems like it could pack up at any time. This sort of noise cannot be right.
  2. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Did they fit TRV’s when the change over was done
  3. Luna

    Luna New Member

    Hi thanks for your reply.

    I don't know if they fitted them at the change over as I didn't live here at the time but we do have them on all the rads.
  4. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    That can impact the sound. Is it all radiators??
  5. Luna

    Luna New Member

    My OH just said the TRV's are older than the new boiler.

    All radiators make the noise but some are much quieter and others get very loud. The one in the upstairs bedroom is consistently very loud.
  6. Jimmy18

    Jimmy18 GSR

    I would add an automatic bypass to the system if one is not already fitted. The noise is the trvs on the system. They may be on the return and not the flow which can be noisy if they are non bi directional. Also a proper balance of the rads wouldn’t hurt
  7. Chris Travers

    Chris Travers New Member

    Hi there I'm new to the forum trying to find some answers
    I had a noisy system a while ago when my boiler was about 12 months old after draining down

    I had an engineer out who couldn't solve it so I went on a forum. One bit of advice was to turn down the kw on the boiler as the boiler was oversized for the house

    You have to get into the diagnostics menu by pressing some buttons in sequence. I dropped the kw down to 14 and this solved the problem

    I've since racked it up to 20 as the cycling was too long off

    Ask on this forum on how to get into the menu. I've lost the details
  8. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Did you guess at your kw ??
  9. Chris Travers

    Chris Travers New Member

    Basically yes. Not being in the trade a case of suck it and see
  10. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Well this is the point to actually make your boiler work as efficiently as you can then a proper Heatloss calc is required
  11. Chris Travers

    Chris Travers New Member

    Totally agree, it was just to get over a screaming noise, maybe there was a temp fault I don't know

    I might ramp it up in small increments to somewhere near the full load. I could have shot the engineer that fitted the boiler
    28 kw boiler for an extended 3 bed semi is a bit much
  12. sammathias

    sammathias Plumber GSR

    What make trvs are they??
  13. Luna

    Luna New Member

  14. Luna

    Luna New Member

    Thank you. We had seen this on the net and wondered if they were the wrong way round. I know very little about TRV's as I grew up with 1960'S rads that didn't have them.
  15. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Does the trv pipe get hot first ?
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