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Discuss Boiler with no radiators in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. grogoreo

    grogoreo New Member

    Hi,

    Is it ok, after draining the system and removing all but one radiator to turn on the combi boiler, in order to get hot water, until new radiators are installed?

    I've left the pressure at 0 so haven't filled up the system and have put capnuts on each TRV side just in case. (Couldn't get capnuts to fit lock shield 15mm or 22mm) So I could pressurise if needed.

    Thanks, Greg
     
  2. bogrodder

    bogrodder Plumber GSR

  3. grogoreo

    grogoreo New Member

    Thanks, I appreciate the reply.

    I presume the only problem would be if I turned the heating on, with no water in system, and this could damage the pump or something.
     
  4. Stu-B

    Stu-B Active Member

    No, if you dont re pressurise the system the boiler won’t fire and the pump won’t run
     
  5. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    No your boiler requires a min heat leak at a min you could link the flow and return pipe from the rad valves eg stick a pipe between the valves
     
  6. bogrodder

    bogrodder Plumber GSR

    Sorry, didn’t you said you say you were leaving one radiator on with water in?
     
  7. Stu-B

    Stu-B Active Member

    I read it as leaving the pressure at 0 so haven’t filled up the system..
     
  8. grogoreo

    grogoreo New Member

    Yes, but I should say there's actually two because I couldn't close the TRV on second so leaving it till new radiators come. I haven't filled the system so there's no water, fully drained.

    So I did turn the boiler back on and hot water came out fine. I just wanted to check if this was going to damage the boiler in anyway.
     
  9. Rob Foster

    Rob Foster Top Contributor!!

    carry on re pressurise to 1 bar bleed etc. switch it on open valves etc and give it a go. should be ok ...what sort of combi....lets us know how you get on, makevsure the rad is open and bled
     
  10. bogrodder

    bogrodder Plumber GSR

    It is a Sunday and I am hungover, but I assume there’s water in the boiler?
     
    • Funny Funny x 1
  11. grogoreo

    grogoreo New Member

    When I say there's no water in the system I mean I've drained the radiators by the drain cock so pipes are empty.

    "Rob Foster"
    I have a Worcester Greenstar iErp combi boiler.
     
  12. scott_d

    scott_d Plumber GSR Top Contributor!!

    Don’t use it with no water in the system
     
    • Like Like x 1
  13. Rob Foster

    Rob Foster Top Contributor!!

    is there any water in you tho..sounds like it might be pure alcholol...and why not it was saturday after all ...Cheers
    Rob Foster aka centalheatking
     
  14. grogoreo

    grogoreo New Member

    Thanks for all the info.

    IMG_20190714_170420253.jpg

    IMG_20190714_170548954.jpg
     
    Last edited: Jul 14, 2019 at 5:48 PM
  15. Rob Foster

    Rob Foster Top Contributor!!

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