ᐅ New Construction – Energy Consumption of the Heat Pump / Electric Auxiliary Heater

We built a solid single-family house with a heat pump. We moved in on September 1 of this year. I am quite concerned about our heat pump, as it has consumed 1500 kWh in just two months. Today the consumption has increased by nearly another 200 kWh. September and October were unusually mild, with only two days experiencing frost on the ground. Both the heating technician and the construction company consider this usage reasonable, so I have not discussed it with them again.
I researched how these heat pumps operate and took a closer look at the energy consumption of my unit (see photo). I found that the highest consumption is attributed to the electric auxiliary heater—1288 kWh.
What do you think about this? Could there be something wrong with the settings? Is the compressor not working efficiently? Shouldn’t the auxiliary heater only activate at significantly lower temperatures?
The heat pump is an air-to-water Logatherm WPLS 8kW from the company Buderus.
Thank you for your opinions.

A few more details about the house:
1.5-story single-family house built from solid materials according to the 2018 Energy Saving Ordinance, 156 m2 (1,680 sq ft)

Uh oh, something is definitely wrong here. How can the heating installer say that this is normal?

The auxiliary heater/heating element should basically not be running. It might activate briefly if the temperature is -10°C (14°F) or colder.

Bivalence point at +10°C (50°F) instead of -10°C (14°F)? Or maybe the compressor keeps shutting down with an error while heating because the heating thermostats are closed, causing insufficient flow, or there is some other issue with the hydraulics.

Read through the heat pump’s manual and check all the settings, error logs, current consumption displays, etc., that you have access to. Try to understand what is going wrong, how the heat pump behaves at different times, and when the compressor is running.

Alternatively, put pressure on the person responsible. Nothing about this is appropriate.

Or contact the manufacturer directly.

One could deliberately choose to omit the electric heating element. Let’s see what happens then.

The heating rod should only activate in emergencies, but here it is running continuously.