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R
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razor
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November 21, 2024
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EcoDan flow temp dropping over night at coldest time

  • November 21, 2024
  • 33 replies
  • 625 views

I have noticed that over night the flow temp drops a lot and our upstairs temps fall quickly.

Downstairs is very nice and warm.

Could anyone help explain what might be happening here?

My curve is 45@0 and 20@20. As you can see in the graph the flow temp was at its coldest when the temp outside was coldest. Graph is a 24 hour period.

 

Best answer by juliamc

Updated on 26/05/25 by Abby_OVO

 

Hmm. As I feared your installer had little interest in the running costs of your heat pump. That insulation is poor. You can improve matters and it won’t cost a huge amount. Screwfix, B&Q etc sell that grey foam pipe insulation. Your pipes there will be 28mm and poss 22mm. Every pipe that feels hot should be properly covered, as any gap will mean a little bit of heat loss.

 

It’s easy to cut with a bread knife or similar, cut at angles to fit it tightly together and round bends so there are no gaps. I used the little clips to hold it together as I found tape didn’t stick.

 

Make sure you keep a note of what it looked like before you make improvements and keep receipts if you’re going to demand reparations from your builder!!!

 

We’ve also got lots of other helpful topics from other users with Ecodans, check them out below for more:

 

33 replies

juliamc
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juliamc
Rank 20
November 21, 2024

Taking a guess here: I’m assuming you have radiators upstairs, is the water struggling to make it round the circuit into the upper rooms ? Do you have TVRs fully open in all bedrooms ? Is the cooler bedroom at the furthest point from the pump ?

R
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razorAuthor
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November 21, 2024

Thanks for your reply.

Upstairs is full UFH. All stats on 21 so calling for heat all the time

    juliamc
    Rank 20
    juliamc
    Rank 20
    November 21, 2024

    Is this your first winter with the heat pump ?

      R
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      razorAuthor
      Rank 5
      November 21, 2024

      Is this your first winter with the heat pump ?

      No. We moved in November last year. It’s a new build. 
      There are many complaints of poor upstairs heating on the estate. 
      £18 on electric yesterday and the upstarirs rooms didn’t get above 16/17

      juliamc
      Rank 20
      juliamc
      Rank 20
      November 21, 2024

      You should definitely get the installers back !! Do you know who they are ? Where in the country are you ?

        juliamc
        Rank 20
        juliamc
        Rank 20
        November 21, 2024

        Can you post a photo of the back of the outdoor unit please, showing the pipe work. That’s often a guide to how conscientious the installer has been. 
        I would say 45 deg C flow temp is high for UFH so maybe your unit is struggling in this cold weather, let’s rule out if it’s been poorly installed.

        Any other photos of your kit would be useful.

        …I’ve just looked back over your previous thread from last year. Did you get it running ok in the warmer months ? Did you get the wireless controller ?

         

        R
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        razorAuthor
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        November 22, 2024

         

        R
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        razorAuthor
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        November 22, 2024

        Honestly the upstairs is never warm. Gets the solar gain in the day but when the temp drops there feels like nothing going into the rooms at all. 
        Many other residence have pointed out underlay and carpet is not the correct spec and also very thick timber floor. 
         

         

        juliamc
        Rank 20
        juliamc
        Rank 20
        November 22, 2024

        Do you know who the installers were ?

        As this is a public forum I hope you won’t mind if I share these pics and your situation on LinkedIn ? There are top hp installers I’m following who may be able to advise. 

        There’s a company called PrimaryPro who sell proper outdoor grade insulation. If you see how it should be done you can see how bodged that insulation is. It’s an awkward job to retrofit in that small space between the wall and the back of the unit, it would make a difference though as you’re losing heat through all that bare metal. That would be a start.

         

          R
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          razorAuthor
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          November 22, 2024

          Feel free to share. 

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            OVO Energy Ltd, Floor 5, Crescent, Temple Back, Redcliffe, BS1 6EZ, (Company no. 06890795) registered in England and Wales.

            OVO (S) Gas Limited is registered in England and Wales (Company No. 02716495) at Floor 5, Crescent, Temple Back, Redcliffe, BS1 6EZ.

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