Annual consumption of air-to-water heat pump plausible?

Basement heated? Annual performance factor known? Operating hours of the heating element known? Room temperatures and hot water usage? Buffer tank available?

Feels like too much at first.

6300 kWh electricity Single room control Household electricity runs through a separate meter. Heating element activated

then read the operating hours of the compressor and the heating element, then you have your answer.

Don't know our consumption, but pay 80€ / month for 240 sqm (2 units) or 7 people in the house for electricity for the pump. Also have collectors for hot water on the roof.

Depending on the conditions, it is not so absurd.
A few examples that promote high consumption:
- Hot water set to 60° and showering for half an hour every day
- Heating the basement above 22° (possibly poorly insulated in a kfw70 house)
- Pump poorly adjusted
- Individual room control
- No ventilation system, so lots of manual ventilation
- etc..

Assuming you have a relatively poor COP of 3, you come to 19 tkwh heat. With high hot water consumption, about 12-13 tkwh for the house. Possibly realistic.

But if you use water sparingly, have hot water set to 45°, do not heat the basement above 18-19°, and also do not heat the rooms above 22°, it can also be significantly too much...

is also a lot of heated space... is definitely not completely out of proportion.