Monoblock into 270l store, input and DHW coils both corrugated high-recovery, 3m2 area. Reheats til the thermistor halfway down the tank hits 50 so flow (and the top of the tank) are about 5c higher. That allows a shower before recovery, recovery takes 30 mins or so, but the ASHP ramps up quick enough that flow can be sustained near indefinitely at reasonable flow rates.
All heating flow passes through the TS as a buffer volume too, so the whole volume of water rarely drops below 40c during the heating season. PV diverter and woodstove assist in adding energy when possible also
Can't be precise about COP as I don't have energy measurement, but the highest daily consumption I've ever seen for the ASHP in the depths of winter is just over 30kWh; our monthly electric bill for the whole house (240m2) all-in is about the same as the oil usage in our previous little bungalow as most of the heating is accomplished during the E7 period 🙂