DamonHD

One rad change here retrofitting from gas to ASHP. Actually I should probably have bumped it up in size a bit further. But no other changes. For a new house I might well choose UFH at least in part, but that doesn't seem necessary.

A couple of visits to -5C here in sunnyish London have passed without incident for our ASHP. Flow temp got up to 47C... (I have 50C@-7C for one end of the WC 'curve'.)

If the embedded carbon/energy is a concern (and generally I don't suspect that it is for machines of this level of complexity), couldn't you gift it to a local gas spares place or GasSafe person for parts? When my combi was stripped out I did just that with the rather expensive heat exchanger that I'd put in just a year before, and the man was very happy. The sooner people switch to ASHPs and stop directly adding several tonnes per year of CO2 to the atmosphere via the flue, the better.

On my system am I pushing the weather comp curve down a few degrees (ie applying a setback to flow temperature, not room temperature) during peak: https://www.earth.org.uk/heat-pump-16WW-control.html#current I am actually on a flat tariff, but I did think about how I might make this work saving cash and carbon with Cosy: https://www.earth.org.uk/heat-pump-16WW-control.html#Cosy For our old gas combi I did indeed have the space heating entirely off for 4pm to 7pm.

Would a forced convector (ie with a fan) do a better job of distributing the heat?

Didn't see in there a link to NESO document: https://www.neso.energy/industry-information/connections-reform/connections-reform-results

Porous Tile Stain Dementia?

It optimises for occupancy, reactively and predictively, yes. Most people want lower temperatures while sleeping, but maybe not an icy room as they go to bed. That's effectively what Radbot aims for.

I agree that that fault mode is plausible.

There are solutions such as ... ahem ... Radbot, which don't need any particular central hub/stat and help manage the temperatures in each room automagically.

It may be @Pocster's WC seen from above with him on it...

https://www.gov.uk/government/consultations/feed-in-tariffs-fit-scheme-indexation-changes/changes-to-inflation-indexation-in-the-feed-in-tariffs-fit-scheme-consultation-document-html

By ensuring the that the system tells them just what they need to know to get there, and helps them along, assuming it's possible. ("Heat the house for zero cost with all the windows open when it's freezing outside" doesn't have a good solution!) And not expecting the end user to have a physics degree: "folk physics" seems to be bad in general.

By agency I mean "to make it do what the user need,s at reasonable cost" rather than necessarily "to understand each of the 50 control parameters". I had near neighbours who had a HP in new (badly built) social housing with no explanation on use, ending up with a ~£4k heating bill ~15Y ago. Agency would avoid that.

OpenTherm isn't open: I think you have to pay a lot to look at the spec and thus I haven't ever seen it. I suggested some time ago to LG and others that there should be a mandated basic common interface across all devices of a given type, but which does not prevent a manufacturer adding their features on top. Indeed this will be the final bit of my PhD research - how to give normal humans more agency with heat pumps than most ever had even with gas.

I am a bit late to this party, but my HP + smart TRVs (obvs!) combo seems to work well. I'm about to start a paper on my work showing that TRVs and retrofit HPs can work well, and one difficult area is 'comfort'. I am happy with daily temperature cycling and summer and winter, and not heating more than needed overnight for example feels like a win on energy and comfort (and I hope to be able to share experimental results to that effect), but huge numbers of people seem to feel that the only comfortable temperature is a rock-steady one at or above 18C... Which amused Prof Mackay then Chief Scientific Advisor at DECC, when told it by a senior boffin from BRE (I think) at a big meeting at the end of 2012. Mackay said that his family (including very young child) turned the heating up for a bit from 14C if they began to fell chilly. Anyway, am I the only one happy with daily temperature cycles?

5m between what and a boundary?

All this stuff is going to become more important to help delay or schedule substation upgrades, etc. And so there has been evidence gathering on what info should be collected and collated by whom, and who should be able to see that data: https://www.gov.uk/government/calls-for-evidence/improving-the-visibility-of-distributed-energy-assets

The DNO and others may well care about how many kWh you produce/export as well as peak kW or A because of their diversity calcs. At the very least it adds more noise to the industty settlement process. And I've been involved in NG/ESO and gov discussions about understanding where assets are and how they behave. You won't be helping! B^> Realistically, adding a couple of panels' worth of generation - ie a small chunk of a existing output - probably won't hurt anything. And I'm absoutely not going to show you this: https://www.amazon.co.uk/dp/B0CJFTBR41

Your existing system will have been signed off with the DNO, and possibly a FiT administrator, with a particular configuration and capacity. That is what you have permission for. Changes may require new permission or at least notification.

Our family of 3.5* in small end-of-terrace use ~6kWh per day excluding heat/DHW. *daughter at uni but with us on breaks!

If you add them to an existing system for which you are getting FiT then you should tell your administrator and they will scale down future payments from what your generation meter says to compensate, ie to only pay for the PV that went in under FiT. Also, in principle, you should tell the DNO, or ask first if you would go over 16A per phase, I think.

No footballs kicked in around in my garden, but they don't feel fragile, and have been up some years now. https://www.earth.org.uk/expanding-off-grid-PV-system.html#20160722

I use mine for an off-grid system, and they are functioning as a privacy screen as that wall is quite low!

FYI: https://wind-curtailment-app-ahq7fucdyq-lz.a.run.app/