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razor
Rank 5
November 21, 2024
Solved

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

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juliamc
Rank 20
juliamc
Rank 20
November 30, 2024

I have a Flir camera - it’s really good for finding out those invisible heat differences. Cold corners and heat pouring off pipe work etc.


I wish I knew how you could get some progress on this. Any luck with getting all the neighbours together ? Is there anything you can do regarding any house builders guarantee ? Or building or trade standards ? ​@Jeffus ​@Nukecad do you know ?

Meanwhile just improving the lagging on those outdoor pipes should help for starters. 

Nukecad
Super User
NukecadSuper User
Super User
November 30, 2024

Not something that I’m well up on.

I guess that to get any action (individual or group) going from a legal point of view then you would have to somehow show (prove) that the installation or the design was negligent or defective in some respect.
Much easier to say than to do,

For new build heating than I’d suggest that you would start by wading through:
Approved Document L - “Conservation of Fuel and Power”.
https://www.gov.uk/government/publications/conservation-of-fuel-and-power-approved-document-l

Heat Pumps are covered in there.

Good luck with that - The Approved Documents are the standard planning and building guidance to various aspects of the Building Regulations,
(I’ve used some of them myself when doing outline plans for conversions and extensions),
They do save having to wade through all the actual building regs, and do explain what the regs mean in practical terms, but the AD’s themselves can still be complicted  to follow for some aspects.

PS. Depending when the properties were built you may need an older version covering that time, there is a link at the bottom of that gov.uk page to the archived versions. However as this was a new build last year then the current version will be the one that applied

I said, Hey - Watts going on.
    juliamc
    Rank 20
    juliamc
    Rank 20
    February 16, 2025

    ​@razor Did you ever get anywhere with your heat pump problems? I’ve just had a comment (where I’d asked elsewhere) about your system. If I understand correctly that short vertical pipe connecting the two longer horizontal pipes outside could be a problem, also those poorly insulated flexible pipes. Did you get a chance to improve the insulation on them ? 
    You could get more heat into your upstairs rooms by removing the underlay. I’ve just read that someone else has done that and had very good results. 

      Terms & ConditionsAccessibility statement

      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.

      OVO (S) Gas Limited is part of OVO Group Ltd