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Vertical radiator loosing heat

Discussion in 'Plumbing and Central Heating' started by creative101, 2 Nov 2019.

  1. John D v2.0

    John D v2.0

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    So you're saying you get 20 seconds of cold water and then hot water after that? I understand now. So that throws out my line of questioning.
     
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  3. John D v2.0

    John D v2.0

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    The water trickling noise is probably just bubbles collapsing as they go round a corner, perhaps the water velocity is too high or there's a tight corner. Some people don't like to use elbows for those reasons. Or it could be air entering the rad, but it sounds like we have ruled that out
     
  4. dilalio

    dilalio

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    Verticals are notorious for trickling noises... Just part of the internal waterways usually.
     
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  5. martin hill

    martin hill

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    After a good read thru again of this post you have always had the problem of getting water to flow thru the loft rad even before the new bolier. It maybe a flow issue in the pipe work just after the loft rad restricting the flow going thru the rad The water getting pumped around the system will take the flow of least resistance. So where it T's off to go upto the loft has a high resistance so the water doesn't flow that way. Turn off all rads except the loft and pop the heating on with the pump on full. Might still have so sludge in pipework flowing from the loft rad.
     
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  6. creative101

    creative101

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    the radiator next to the vertical is a towel rad which heats up nicely (it always has). the system was power flushed about 3 years ago and ago couple weeks back.

    What’s really confusing is that bleeding the rad of some water resolves the heat problem for about a week and then it’s back to normal..... really frustrating.
     
  7. dilalio

    dilalio

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    By bleeding off some water from the rad you're, in effect, "stirring the waters" which would appear to be enough overcome the resistance in the rad to the flow.

    Might just be neutral point in the system and I'd be focusing on getting the other rads closed down as much as poss without robbing them of flow.
     
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  8. creative101

    creative101

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    thanks. going to start balancing each radiator starting with the one closest to the boiler and see how it goes.
     
  9. dilalio

    dilalio

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    Easiest way. Shut them all off, except vertical, let them cool and then just crack open each one. Leave for a bit and see which, if any, get hot. Then crack cold ones a bit more and so on.

    When they're cool... You can just feel the bottom corners to see if heat is coming into them... Don't need to wait for the whole rad to heat up.
     
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  11. martin hill

    martin hill

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    With bleed the rad you are allowing space for the hot water to get into and as Dilalio says stirring the water. If the towel rad getting hot it maybe a flow issue from the loft tail pipe back onto the system. Turn off all rads except the loft an see what happens. If it heats up and runs slowly open each rad one at a time and try balancing that way.
     
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  12. ianmcd

    ianmcd

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    Check the installation instructions for your vertical radiator, some come with a baffle fitted (not all) if it does have a baffle the flow and return MUST be connected the right way round, the flow will always be hotter than the return
     
  13. creative101

    creative101

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    Oh man....
    this is what I’ve just done. The vertical heated up and then I opened the others enough to let the hot water flow through, starting with the one closest to the boiler. The only rad which needed about 1 full turn was the towel rad near the vertical. It took a while for this to heat up but it eventually did.
    Now..... have to wait a few days and see if the vertical stays hot.
     
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  14. dilalio

    dilalio

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    As other TRVs shut down, throughout the week... The vertical should get concentrated flow at some periods... Which would ensure it comes on... Hopefully, throttling the lockshields as the other rads demand heat will stop it being starved. Fingers crossed (y)
     
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  15. creative101

    creative101

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    Update... just as I feared. After 5 days, same problem. Only one panel is hot, the other 3 are only warm. All panels were getting hot for a few days.
     
    Last edited: 8 Nov 2019
  16. martin hill

    martin hill

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    Oooh dear. So the loft rad got four vertical panels.
     
  17. creative101

    creative101

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    yes
     
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