I think auto adaption is best suited to fast response emitters, like rads or fan coils. It is essentially load compensation.

The system has now been running 24/7 since Friday in weather compensation mode and the house is sat at 21c downstairs 20c upstairs. 

so far we seem to have big electric savings I would put most of this down to the removal of all the extra pumps and control rather than heat pump as this still needs better control to get the most out of it.

I have slowed the upstairs flows to match the Delta T of downstairs as you can see the temperatures have become a lot better compared to the original. I am going to aliexpress some more cheap thermometer so I can better balance the system.

I briefly tried Auto adaption but this raised the flow temperature a lot, s this due to my heat pump constantly running around its lowest frequency (possibly oversized) I have used 540 code to see that I am getting a flow rate of 15 this seems ok but possibly a bit low for my heat pump?

today with it 5C outside I am still getting cycling so I am considering trying to schedule stops letting the slab cool slightly before adding more energy in what do you think?

please seen the before and after pictures of temps and flows

Well done.

I had some time the last few days and with the warmer weather decided its now or never.

I'm no plumber but for a first go I am fairly happy, 4 pumps and the low loss header have now been removed.

I have had the system running for a few hours and am please to report monitoring the manifold l/min flow gauges before and after the mods there has been no loss in flow 😀 

I did then have to shut the system down as I have a leak that I will have to fix on Friday 

moving the dip switches to set up the new one zone I discovered several more errors like the PWM for the pump just being unplugged 

going forward I will look at balancing the system (upstairs return is much hotter) and changing my running style to auto adaption.

I've added some pictures 

I have to agree with you about the low flow temperatures not working out for efficient running mine suffers terribly and is cycled far to much at anything from about +2c  you can see the flow and return temperatures raising as the UFH can not give away any more heat and the heat pump is as low as it can go.

I think moving off weather compensation and having longer off times will work out more cost effective the issue I have at the moment is most of the pumps are not controlled via the FTC removing the pumps and turning the 3 remaining stats for temperature limiters leaving the main FTC as the one main stat goes hand it hand. Trying to rewire the pumps to do that will unfortunately be quite extensive.

In regards to the warranty this is not something I am really bothered about keeping I'm more keen on just having the simplest most efficient design