Post and beam

I self installed my brink ducting. 200 sq metre 2 storey, with 90mm green ribbed semi rigid. Agree that it is a lot of work.Although its only semi rigid it gets to feel pretty rigid when trying to manipulate it through joists etc. I have 15 runs in total. I had to get a little creative with the routes up through to the loft from the ground floor. To the extent that even the Potton quality manager said, 'thats a good idea'. It goes together easily and very securely by the way as has been said already.

Exactly, and thank you. As per the above observation from @SimonD , i did indeed have many conversations with the installer,( and others that i rejected because of their responses). The entire point of this story is that i have not had what i have actually already paid for. Now, i take on board all the advice about tuning and optimising what i have. i am truly grateful and it might be that this gets me to where i have a balanced upstairs and downstairs. As an aside, i realised today that if i am operating in pure WC mode then the Hallway mounted room 'stat that i stressed so much about moving is in fact not relevant to my temperatures.

40c if i remember correctly. I always wanted no more than 35 if possible. Downstairs UFH is operating at below 30 currently

No they are not at the target temperature. And because i dont have seperate temperature control upstairs i wonder how it could be otherwise. Not withstanding that the radiators are the sizes specified by installer.

I only really mentioned the Delta T figure because the discussion usually mentions a 7 degree Delta T when the topic comes up.

No. Apologies, appear to have missed responding to that.

So if i installed a mixer and ran the radiators at a slightly higher temperature. How would the UFH behave? bearing in mind the gentle .4 WC curve remains (perhaps not) #A: down mix temperature to some value and run for as long as ... well how long actually? #B: Run at the same temperature as the radiators but for a short period. Currently the Delta T is 3 degrees so the down mix would be minimal would it not.

Yes its the 720/3 senso comfort and its on 'active' if i remember correctly. Rads are K2 at the sizes specified. I dont believe these are the issue. Not an expert and happy to be proved wrong but they have no option to be controlled seperately and that is what i asked for and is in my unqualified opinion the issue.

Room stat is wired and downstairs, my choice to have it hardwired, possibly not one of my finest. The UFH actually heats the ground floor very well and therefore does indeed switch off at desired temp. As previously mentioned. The manifold temps this morning at 7 when it was heating were 25c flow & 22c return. ( analogue gauges on the pipework) The 35c i mentioned was the highest i hoped it would need to run at for efficiency sake and not a set temp. It looks like it does not even need to run that high yet. For info the WC curve is .4

Vaillant Arotherm 5kw. 2 months old. one week since moving in.

Thanks Nick. I think i have enough space to install a TMV to the 22mm pipe pairs. As an aside my flow & return temps gauges show 25c and 22c, so a Delta T of just 3 degrees. Still waiting to hear from my installer. I am about to become mister angry customer.

Hi @Nick ? Can i recover this to an acceptable solution without major surgery?

Exactly. Hence my question to my installer. I dont believe they have delivered what i asked for. As it happens, and totally unsolicited the MCS guys have asked if they can audit my install.

The yellow vertical pipes come from the Ashp up through the slab and go left and up to the UVC. They are 28mm. On the manifold picture the 2 pipes come from the UVC area upstairs, they are 22mm. No TMV .