Quite cunning but the drawback to all schemes involving mixing valves is that the HP has to run at the higher of the two temps, so you get the lower of the two possible CoPs all the time.
Is there any possibility of a bit of time division multiplexing so you can run each zone on its own at the optimum flow temp, for part of the time at least?
Similarly, I am about to re-do my (current, gas-fired) HW programming so it heats up while the CH is off and hence doesn't compromise the weather comp and the attendant condensing mode operation.
Caveat - unhelpful post (somewhat).
I have mitsubishi A2A linked up to MEL and that app is woeful. It reports my energy usage as 2kWh a day in winter which is lovely but very wrong.
Short of 'on' and 'off' I have no confidence in it even when all component are mitsubishi.
i hope it's just the AC system that suffers from this but I suspect it's not. I doubt it's playing nice with non integrated components. It doesn't even play nice with itself.
I panicked because the installers ended up installing the doors a couple of mm higher than planned, so our gap was only 6mm, but engineer had specified 8mm deflection. Its been in for two years and all fine. It is annoying to end up with a 45mm surprise, but you will soon forget it. Agree you should move on.
In future, insist on signing off on detailed drawings before handing over any money.
Currently we have a house UFH and summer house UFH operating as a single zone. But the summer house heating is pretty rubbish, so use an electric heater also. Now the temps are dropping the electric heater is starting to run through electric.
to heat the summer house twice over the last couple of days and used around 14kWh. It is only going to get worse as temperature drop, becuase the the summer house is being used most days.
So issues are, I need two very different flow temperatures, one for summer house and a much lower one for the house, the heating season for the summer house is much longer also. So need to make two zones.
Since decommissioning the gas boiler, I have an Alpha Flowsmart 50L cylinder (previously used for combi boiler preheating), so will repurpose as a buffer, plumbed as a parallel, 2 port configuration across the supply and returns. Will follow the recommendation of Kensa heat pumps complete with PRV (by-pass valve) to engage the buffer only when needed.
Also in my parts store is an ESBE CUA100 (cheap off eBay a while ago). This is an electronic mixer valve, that can be operated in either of two modes, fixed flow temperature or a modulating flow temperature based on house temperature. It incorporates a timer which works in both modes and allows a second temperature to be set. So in theory you can increase the temperature (either house temperature or flow temp) during E7 and lower at other times. So will install this and a pump on the house UFH. The summer house will be run on weather compensation, direct from the ASHP.
Just waiting for a new mixer valve to arrive. Controller is installed and everything seems to work, as it should. Have put the controller in the lounge using now defunct thermostat wiring and will use this room as a reference temperature. Will run on house temp mode first to see how it goes. If it not stable, its just a setting change to switch mode.