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Proposed pipes layout for adding a rad

Discussion in 'Plumbing and Central Heating' started by sotal, 30 Dec 2020.

  1. sotal

    sotal

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    After much floorboard pulling, I now think I've pretty much mapped out the current heating circuit.

    I've attached an image showing the before (current pipe layout) which has the new rad at the top right not connected to anything. As you can see there are currently 3 rads connected off one set of 15mm pipes. This currently works but I don't want to add another to those 15mm pipes.

    My plan instead is to T off the 22mm half way round, and bring that across. Then to connect the new rad and one of the other rads to that 22mm branch.

    Is this the correct way to do it? Any thoughts or considerations before I plough ahead?

    Thanks
     

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  3. sxturbo

    sxturbo

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    The flow should be taken from the end of the existing 22mm to create a kind of manifold scenario.

    Taking the flow from where it is proposed can cause a flow differential that might be difficult to balance.

    The return is fine
     
  4. sotal

    sotal

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    Well that makes it a bit trickier!

    The end of the 22mm flow pipe is currently a straight reducer to 15mm which then bends off to feed the rad.

    Would I just tee in an inch or so short of this with a 22mm equal tee and them come straight down and then make a right turn to join the pipe where I was going to before?

    Thanks
     
  5. sxturbo

    sxturbo

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    Sweat the reducer off and install a new 22mm T with a 15mm reducer built in
     
  6. sotal

    sotal

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    I could do that which would probably stop it melting off anyway as I install the 22mm T. I was half considering just using a plastic tee to stop that happening.

    Would there be any balancing benefit to using the reducing tee, or would an equal tee pushfit, installed an inch or two before the end work just as well?
     
  7. sxturbo

    sxturbo

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    If you can get away with it, avoid using plastic.

    You can do whichever way you like, need to think of the flow though, the 22mm pipe acts like a manifold of sorts, (think of it as a common pressure rail) water will always flow the easiest route
     
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  9. sotal

    sotal

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    I've had another look today and it will be very difficult to correctly come off the end, there just isn't space.

    You say it might be difficult to balance of I branch off half way? Is that just as you say, 'difficult' or is it likely to cause major problems?

    I've just been searching about branching 22mm and it seems to have been offered as advice on some of these forums, with the caveat that the whole system will need balancing on the lock shields.

    As I say it would use less pipe, fewer cuts in the joists and should all fit a lot better.
     
  10. sotal

    sotal

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    Also how about the attached as a possible work around?

    (Please note I've altered the top of the before pipe layout as I found it to be slightly different when removing some more floorboards this morning. There are actually a total of 4 rads off the 15mm at the end of the flow pipe at the moment)


    So with this I was wondering if I could rework the pipework feeding the last 2 rads on the current daisy chain. Leaving the return as it is via 15mm and adding the one extra return to this, but then taking the feed to these from the 22mm earlier on.

    So this would reduce the current group of 4 on 15mm to a group of 2 on 15mm. But would make a new group of 3 on 15mm.

    Is that a plausible way of doing it?
     

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  11. sxturbo

    sxturbo

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    Sorry for crudeness of the drawing but why not take them from here?

    At the end of the day you can take it from wherever you wish and is easiest, it might just be difficult to balance the system, especially the last 3 radiators.
     

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  12. JimCrow

    JimCrow

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    That will work fine.
     
  13. sotal

    sotal

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    I would if I could but there are so many pipes in that area that I can't find a reasonable way through.

    The place I suggested is the only place I can see to get them through without major inconvenience.
     
  14. sxturbo

    sxturbo

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    Then that should be your route.
     
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