Start of the 3rd season on November 5.
This year, since yesterday, I have been trying another mode of triggering the heat pump which allows the temperature to rise a little further, which was capping at 40°C.
Operation season 1 and 2 : the DHW thermostat triggered the circulator of the PAC-DHW exchanger loop, which triggered the start-up of the PAC by detection of the flow rate in this loop.
After a few medium-term tests, we found (see above) that it was necessary to set this circulator to high speed to optimize operation.
Current operation : the circulator runs 24 hours a day (at low speed, we no longer use the DHW thermostat) and the heat pump starts and stops only on its temperature regulation (between 40 to 36)
This allows me to have water that exceeds (a little) 40°C (I don't really know why because the regulation of the heat pump cannot exceed 40°C but it works

) and therefore draw less on the ECS volume.
In terms of consumption, it is less favorable, to be confirmed in the longer term but I think I have at least 20% more consumption...(circulator included)...
To be continued in a few days or weeks...