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Discuss Replacing an old radiator with two smaller ones in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. Alan H

    Alan H New Member

    I have an old type 21 (600 mm by 1400 mm) that is against a wall I'd like to put furniture against, so I'd like to move it. There is no room to just move it along the wall so I was thinking of replacing it with two smaller ones on either side of the adjacent corner of the room. I guess the old radiator was probably just under 2 kW and I have room to put one 600 mm by 600 mm and one 600 mm by 700 mm type 22 radiators - I think they would give me sufficient heat output at just over 2 kW. Each would have its own TRV and I'd put them at the sides furthest away from the corner to minimise one radiator affecting the other's TRV. The plumbing looks straight forward - I'm a reasonably competent but occasional DIYer.

    Does that sound reasonable? Any tips or things I should look out for?
     
  2. Matchless.plumb

    Matchless.plumb Trusted Plumber Top Contributor!!

    Hello Alan,

    I am particularly not a big fan of installing a rad on walls without windows especially not opposite the window walls. There would be no convection if you know what it means. Ideally you will need to put the rads under the window. However, if you want to split the big rad into 2 smaller ones that's fine as long as you get the same heat output.
     
  3. Alan H

    Alan H New Member

    Thanks for that.

    The room is a living room that has a wide arched opening into what was once the outside wall but that now leads into an extension, so there are no windows in that room!
     
  4. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    :rolleyes: Convection will still take place
     
  5. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Op sounds ok

    Do you know the pipework size ? Eg 10mm or 15mm etc
     
  6. Alan H

    Alan H New Member

    I can see the main 22 mm pipes under the floor from the boiler but teed off that is 15 mm pipework that had been used to connect to a radiator in the extension that was removed decades ago, so I'll connect to that. Bizarrely, gate valves have been used to stop the pipe ends!
     
  7. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    15mm will be fine for two rads
     
  8. Matchless.plumb

    Matchless.plumb Trusted Plumber Top Contributor!!

    Not as much and not as efficient
     
  9. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Yes it will :D
     
  10. Alan H

    Alan H New Member

    Thanks, Shaun. Good to know.

    I have no choice because there are no windows so all I need to do is replace the heat output of the one radiator with two smaller ones (and by making them type 22 rather than type 21 - and I will actually be increasing the kW available slightly). They will be nearer the arched opening to the extension so a bit nearer where the colder air will come from - I think that's the best I can do in the circumstances.
     
  11. Alan H

    Alan H New Member

    Is there any difference between wax sensor TRVs and spring ones? I was thinking about getting the radiators from Screwfix - they are offering a free Drayton TRV (which is the wax sensor type) and lockshield 53581 with each radiator and their Kudox Premium radiators seem good and a good price. A 600 mm by 600 mm type 22 is £44.79 inc VAT and the TRV and lockshield.

    Any reason I shouldn't go for these?
     
  12. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Nope

    Just watch there not damaged (the radiator) as seen a few damaged from screwfix
     
  13. Alan H

    Alan H New Member

    Thanks again, Shaun. I know they can be easily damaged through mishandling so I'll be on the lookout!
     
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