MikeSharp01

I don't actually know is the easy answer as the drawing says I need 380m of 16mm and I have brought 400m so I am hopeful that I will have enough for the sensors otherwise I will just use HEP2 (10mm or some such) to place the sensors. I have 10 sensors and they are all calibrating on the desk beside me as I type they are all reading 26.18 +/- 0.12 as the temp of the room, the room thermometer says it 25.4 I guess I need the temperature calibrator out! Once I get my WEMOS board up and running I will do some graphing.

You definition of loads is? As I may have a use.

Are you out there Terry? Just got sorted on the sensors and the Wemos D1 Pro board is on its way, which Arduino IDE / bolt on do I need?

Yes I guess so, I was going to use your Pex-Al-Pex idea and go straight (line) to the sensor points, so I can pull them out for replacements etc, I will fix the runs to the upper R193 mesh.

Just planning my sensor locations and after going through all the treads here have come up with my plan. I will have four sensors across / in the slab. The slab has three UFH zones two which get full sun via the windows and one, at the north end, which does not. I plan to monitor the surface temperatures in the three zones, basic layout as attached, and have a fourth sensor in a no UFH area under one of the internal walls which itself is out of the reach of the sun. Another four sensors will monitor the main flow and each return UFH temperature. There are also several air temperature sensors in the scheme to control the UFH and the summer ventilation strategy with the roof vents. I think this layout will give me enough telemetry to enable me to play with things around detecting solar gain happening at the front of the building while also having control of the heating via the under wall / air temperature sensors as @JSHarris suggests. Have I got my locations right I wonder? Air temps can go in later with the frame build but the slab pour must go ahead in 10 days time.

Probably cos they would be in the insulated part of the building, If cold roof then its a better idea I guess, you can get to them but the standard connectors / cables probably won't run that far.

Someone told me that the trick with Howdens is to get the quote from them for everything you want then sit back and wait for one of their deals to kick in that brings the price down that bit more. It would have worked as we should have done that for the garden room kitchen but took too long deciding if we really wanted the style when the offer was active. (You need an account so you get the offers)

I have access to one - I spend a day a week on it. It belongs to a very old friend who cannot use it any longer so I go and help him out.

Ok PM me when you are ready to send the oak over and we will take it from there.

Here is a celebration breadboard I did this week but cocked up the clamping and on the last cut it moved, pain in the butt, its 295 diameter, - will do another shortly. (The 130 is their total lifespan)

The picture you gave is fine for the fly, the machine will scan it, and for the text just let me know the font.

I can do it if you want Jeremy.

Welcome, some of us are a bit uncouth but entirely well meaning, and always keen to do the right thing, if a little long windedly at times.

Not the batty bats of Farnham surely.

Welcome to THE forum. Sounds like a great project. Looking foward to hearing all about it.

Sorry - my bad. Not sure why I used 11m.

You will need intermediate chambers as you can only go 11m (IIRC) between chambers so maybe thats what the architect was thinking as these chambers will have covers and perhaps you won't want them in some places, eg the middle of a lawn!

Why, one asks probably knowing the answer, would anyone buy a dedicated programmer when a PC, brought a fully functional windows 10 laptop fr £167 last week, and some of THESE which had A-D converter for sensors can control the whole house so much more flexibly.

Depends how far back they have to go. If the meter is on your property you can do it yourself as everything after the meter is your scope anyway, provided its on your land. If on public land then they will charge you but you can do all the uncovering work your side.

How much power are you expecting to draw and how long is the run? PS 25mm2 is 25mm diameter.

@SteamyTeaThat graph is for Ammonia refrigerant, do they use that in domestic systems,? / does it matter much what the refrigerant is anyway I wonder.

So - taking the hint, it looks like it makes best sense to oversize the ASHP unit to keep the noise down? Ours will be right beside the public footpath and I don't want comments about the noise.

All the best, take care and see you around.

Yep - but we will still stand back and look on in awe at the tidiness of the job and it's so much better than the one the gentlemen numpties who did the original @newhome system managed.

Ecology have a reasonable track record but are a little expensive. However they do know what they are doing in this market space. There are other lenders, mostly building societies, but digging one out would perhaps need a broker. See if the broker can find you a mortgage at a better rate than ecology will offer including the 1% fee, if they can you are quids in. If not the go with Ecology. PS Virgin money, Halifax, Nationwide and Hanley all do them.