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question regarding radiator fit

Discussion in 'Plumbing and Central Heating' started by glider26, 7 Jun 2019.

  1. glider26

    glider26

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    Hi,

    I wish to replace the old imperial-sized radiators in our house, total of 9. Two of these old ones measure 1540mm in width and would, according to my BTU calc, be replaced with 1400mm rads. The TRV extensions I see available on the market don't extend to the difference required (140 mm). What is the best procedure in this case? Keep the existing vertical feed and return pipes, and extend horizontally by using solder ring 90 deg elbows and 15mm pipe between the existing vertical pipe and the TRV (or lockshield)?
     
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  3. Iamchamps

    Iamchamps

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    Or just buy a 1500mm radiator?
     
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  4. ianmcd

    ianmcd

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    +1 for above
     
  5. rhinosaw

    rhinosaw

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    I have replaced a few imperial rads with metric and I use these from screwfix. 78169.

    I just replace the chrome pipe with a longer section according to your measurements.
    Works every time and doesn't leak, or not yet anyway
     

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  6. Ian H

    Ian H

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    Lift a floorboard and come up in the right place.
     
  7. FiremanT

    FiremanT

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    Either use 1 1500mm and a TRV, or reduce size, but do it properly.

    If you go for long pipes, be a mate and post some pics.
     
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  8. glider26

    glider26

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    Thanks for the advice. I'll go for the 1500mm option then. I'll have to look elsewhere than screwfix as they don't seem to do them and that's where I was looking.
     
  9. Iamchamps

    Iamchamps

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    A lot of shops don't do 1500mm its either 1400 or 1600 but there are places that do sell them and in my opinion will be the easiest and best looking without a lot of extra work.
     
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  11. rhinosaw

    rhinosaw

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    1500, yes difficult to find and expensive when u do. 1400 from screwfix £70
     
  12. FiremanT

    FiremanT

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  13. glider26

    glider26

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    Thanks, I bought a couple. I’m probably missing something here, but while I can fit one end of the extension into the radiator, the female thread of the other end (right in the pic) seems way to big for the 1/2 inch male thread of the TRV/LS. Please advise.

    Also, to replace the chrome pipe with a longer one, do you just saw the one they supply in half?
     

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  14. rhinosaw

    rhinosaw

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    Hi, I thought that u were going for the 1500 rad?
    I don't use Trv's and must admit to not knowing much about them , looks like they have a 1/2 inch connection, wonder if all Trv's have that same size connection and why?
    Doesn't help in our situation, I haven't seen the extension pieces to cater for half inch but I suppose they must do them.
    Sorry about that, I was unaware, perhaps a pro can enlighten us?
     
  15. Ian H

    Ian H

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    I think that’s for an older 3/4” valve.

    On ours the extension was plain 15mm pipe sized into the valve and 1/2” threaded for the radiator on the other end:

    BAACCCC1-A25F-4CBF-8B9F-155C22E7DE3A.png
     
  16. rhinosaw

    rhinosaw

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    So are rad valves changing from 3/4 inch to 1/2 inch or have there always been 2 sizes or is it just for trv.......I wonder
     
  17. Ian H

    Ian H

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    No idea. The old ones were 3/4 and the new ones like a 15mm compression fitting but i’m not sure if that’s normal or not.
     
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