I also believe that the power consumption is too high. Either ask the manufacturer whether it might be due to a defect. For example, at the [Messtation]...
Flow temperature 30.4 ° Return temperature 27.3° I have attached a few pictures regarding the distances.
Distances seem to be more or less okay. At what outside temperature do you have the mentioned temperatures? Otherwise. 1. Turn up the ERR fully or remove the actuators right away. Then carry out the thermal balancing. 2. If a bypass valve is present, then close it. 3. For a heating buffer, adjust the system to appropriate flow rates. 4. Without a heat meter, it is difficult to narrow down the problem. One simply does not know if the heat pump is inefficient or if you really have such a high heat demand. Regards Nika