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Discuss Bathroom radiator hot on both hot water and central heating... in the Central Heating Forum area at

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  1. Aaron

    Aaron New Member

    Hi all,

    Could someone with a little more experience than me please confirm my understanding, as I have not seen many of these in the field.

    I have heard that some systems, particularly older systems, tee in the bathroom rad into the primary circuit. Is this done simply by teeing into the primary flow after the pump, but before zones, as per the image? In addition to this, is the return piped correctly, as per the image? If so, I am guessing the bathroom rad is simply acting as a large by-pass valve...

    Thanks in advance...

  2. brum

    brum Plumber

    Yeah I've seen it done like that I thought it was very strange because it could short circuit heating in my opinion...brum
  3. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

  4. S.P.S.

    S.P.S. GSR

    Correct, sometimes called “summer heat” you will normally find a gate valve as a balancing valve so not to completely bypass the system.

    Personally I think it is a great idea, as towel rads in bathrooms are able to dry towels all year! I’m not talking an 1800x600, mind.
    Then a separate panel rad to heat the room in winter.

    Generally only in bigger bathrooms.

    Last year we did a large project and 3 of the bathrooms had this set up. Very nice job indeed


  5. Ric2013

    Ric2013 Plumber

    Bathroom slightly spoiled by white pushfit connector under WC cistern IMO. Picky or what lol? But very nice, and I do have a soft spot for panelling.
    Re. the original question, yes, sounds about right. If that's how it's plumbed, with the return tees and flow tees not in the same order, then there is a risk of gravity circulation up the central heating return pipe, depending on the precise layout of the pipework (symptom would be a slight warmth in CH radiators). But if it works, then it's fine.
    I think having the bathroom radiator on its own circuit as you have is a very good idea: in spring and autumn it can very often be too cold for the bathroom when the rest of the house is at a perfectly acceptable temperature.
    • Funny Funny x 1
  6. Aaron

    Aaron New Member

    Thanks for all the replies, guys. Much appreciated...
  7. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Yes , lol . Those pushfit connectors are the dogs pal , far better than a fibre washer that could last one week or twenty years .
  8. S.P.S.

    S.P.S. GSR

    I never normally allow any pushfit to be seen, but those connectors are far too handy much easier to future maintenance!
  9. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    You can get them in chrome can't you ?

    And only problem I can see is you need to remove the chrome plating
    • Like Like x 1
  10. S.P.S.

    S.P.S. GSR

    Yeah chrome ones would have been a better shout, but il take that one :)

    How do you know it’s not? ;)

    Abrasive strip the last 18-20mm and nothing shows
    • Like Like x 1
  11. Ric2013

    Ric2013 Plumber

    I think you must have removed the chrome from the last bit, as I'm told that it really won't work at all if you don't.
    • Like Like x 1
  12. S.P.S.

    S.P.S. GSR

    I have tried it, then been able to slide the fitting off with out pushing the locking collar in..
  13. Ric2013

    Ric2013 Plumber

    Yeah, thought as much, but thank you for confirming. I'd never tried it as I had been told it wouldn't work/had read technical literature (and, probably, because I've never had occasion to put speedfit onto chrome). A bathroom installer, not trained as a plumber told me it wouldn't work, and I assumed that he'd found out the hard way.
  14. Ric2013

    Ric2013 Plumber

    Or fifty? When I wasn't qualified or working as a plumber, I reused a tap connector onto a new-secondhand FOV in a house I had lived in for 21 years. Unaware that the red bit was replaceable, I left the original washer in place. The washer was already at least 20 years old, and had, quite possibly, been in place since the house was built 49 years prior (in 1962) to my re-using the part. Or would you assume that the washer MUST have been replaced at some point? I'm assuming it may have sprung a trace weep at some point and then furred up.

    The tap connector was originally connected to a BRE Garston type valve (an early incarnation of the Part 2). Sadly, the cistern was asbestos cement and, not wanting to disturb fibres, the original FOV was disposed of with the cistern itself.

    Epilogue: the house was sold 3 years later, still with the secondhand washer in place and no evidence of leakage.
  15. S.P.S.

    S.P.S. GSR

    1 of the 3 lengths of chrome tube did this. The other bit ok, it was a test to see how they held. Needless to say the one slip was enough to persuade me!!!
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