EcoDan flow temp dropping over night at coldest time

Hey ​@razor 

Let us know how you get on trying things out, I’m really glad ​@juliamc was able to help you out with this!! Thanks Julia.⭐

Did you get anywhere with that company ​@razor ?

I never contacted them as the looked very far away. I did contact another 3 local Heat Geek affiliated companies and all of the said yes on the phone and never got back to me after sending details in email. 

​@juliamc did get to borrow f fancy FLIR though….

Also this……

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. 

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

​@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.