Would this work?

Discussion in 'Plumbers' Talk' started by dvddvd, Jan 11, 2018.

  1. dvddvd

    dvddvd Well-Known Member

    Hi working at a friends place and he had a new radiator fitted by a local plumber.

    After they drained system and refilled it all a lot of the radiators are not working very good, and so e not at all.
    Seems there is a blockage on a few. He got the plumber back and he's that busy he said the system needs flushing out but it cannot do it for a few weeks, so he put some sludge remover in the system and said he will be back in two weeks.
    Which is not to good for friend as its a bed and breakfast place and guests are complaining about the coldness and leaving.

    So he's pulling his hair out and said he will have a go this weekend.
    He is planning to take radiator off near door and fit a hose pipe to valve ( there are no drain off valves)
    And let it empty, refill etc for a few hours.

    Would it be better to fit on return valve of the radiator that's been removed a hose pipe from the mains and let the mains fill the system with mains pressure water while it empties from the flow of the removed radiator pipe work ?

  2. Dr Bodgit

    Dr Bodgit Well-Known Member

    Best would be to put some Sentinel x800 in the system and let it run for a while, really needs a magnaclean too to remove crud. Results should be vastly improved very quickly. Just flushing with mains cold water probably won't do much.
    KIAB likes this.
  3. KIAB

    KIAB Well-Known Member

    Pretty poor plumber in my opinion.

    Would also fit a magnetic filter to system (fits to CH return) to collect any crud, highly recommended Magnaclean Pro 2 filter,Wickes are the cheapest for one.


    Then add Sentinel X800 to system & leave in for a couple of weeks before draining & throughly flushing system,& refilling, will need to check filter several times a day for first week.

    A few more details about you friend system, boiler, is pipe work microbore tubing?

  4. dvddvd

    dvddvd Well-Known Member

    Hi thanks just a normal boiler, there are 36 radiators on system. All 15mm pipework.

    It has all worked well until it was emptied and refilled.

    The plumber does not seem to want the job, he came when I was there and had a quick look and said he's to busy so can not do anything now but will be back in a few weeks. ..but when guest are leaving cause it's to cold not a good thing
  5. Dr Bodgit

    Dr Bodgit Well-Known Member

    Are you sure its all 15mm? To the rads yes, but flow and return main pipes are usually 22mm. Might be an air lock.
  6. KIAB

    KIAB Well-Known Member

    36 radiators all on 15mm pipe[​IMG], would expect the main feeds be 22mm then tee off to radiators in 15mm.

    Would think you have a case against plumber to recovers expenses calling in another plumber to sort out.
  7. Dr Bodgit

    Dr Bodgit Well-Known Member

    As an easy see-if-it'll-fix-it, could try turning off all radiators except one, one at a time and then bleeding the "on" radiator. That will force the circulating water through each radiator in turn and hopefully dislodge any blockage or air.
  8. KIAB

    KIAB Well-Known Member

    Work a try, start with on furvest away.
  9. terrymac

    terrymac Well-Known Member

    Whatever you decide to do , DONT touch the lockshield valves . with 36 radiators on the system you will have one hell of a job rebalancing them. If you want to turn a radiator off ,use only the thermostatic valve ( or wheel head ,if no TRV ).
  10. dvddvd

    dvddvd Well-Known Member

    He's spent days turning rads off and seeing if they heat up etc.

    To no avail.

    It's an old property and lots of work as been added on over the years, lots of bodges etc.

    I think the plumber thinks it's all a bit of a nightmare.

    It's not been cleaned for over 10 year since the boiler was changed. The plumber who came has done work for previous owners over the years, so sort of knows the system.

    How the easiest way to add Sentinal x800, header tank or drain off a rad and add to rad? Thanks
  11. dvddvd

    dvddvd Well-Known Member

    There was an extension added 5 years ago with extra rads etc. Don't think anybody knows where rads are piped from, some are connected to rads in room above, some to next room...
  12. It's a B&B?! And there's no heating in this weather?!

    I hope he isn't on Trustpilot or anything like that, 'cos his reviews are gonna be carp.

    DVD, will you be able to help him at all? If it's due to a blockage and if he wants to sort it pdq, then the solution is not to start hosing through anything - unless it's individual rads that have been fully removed and taken outside (in which case also thump them along their bottoms...)

    How to sort this with no pain? Peasy - do as KIAB says and fit a Pro on the return just before the boiler.

    Then remove it.

    And fit this: https://www.ebay.co.uk/itm/Adey-Mag...604337?hash=item239733b7b1:g:OjYAAOSwXEdaVgBl

    Pour a good couple (or more!) doses of MC5 (or sentinel equiv) in to the cylinders, bleed, and let rip. With the boiler running hot, try shutting off most valves and opening one at a time fully (both ends - but NOTE the EXACT position of the lockshield so it can be restored). With that rad open, thump the bottom of the rad with summat firm but soft (ooh-er, missus).

    Monitor the magnets after each rad - that will soon tell you if a blockage was your problem.

    Then sack your plumber...
  13. dvddvd

    dvddvd Well-Known Member

    When the plumber fitted the new rad he drained system and lots of black water came out but just fitted new radiator and refilled never flushed it out, just fitted and refilled.
  14. To 'force-flush' the rads individually - which you probably want to so - you will ideally want both valves open. Note exactly which way the lockshield spindle is pointing, and then count the full and part turns to close it off from there. Write that down on a piece of paper and leave it by the valve. Then open it fully for flushing.
  15. Dr Bodgit

    Dr Bodgit Well-Known Member

    Probably dislodged a load of muck which is now blocking the thing up.
    Deleted member 33931 likes this.
  16. That sounds pretty conclusive, then.

    The chances are the sludge is fairly soft and not too compacted, so I bet a Magnacleanse will have near instant results. You will be gobsmacked - and appalled - by the stuff the magnets collect :)
    KIAB and Dr Bodgit like this.

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