Problems heating the screed with an air-water heat pump

We used 7000kWh for about 3 weeks of heating. Quite a lot went through :D. But we saved on rent and accelerator, somehow you always end up paying for it, right?

No water in the house and 200m2.

How cold has it been for you in the past few days? With the current temperatures, it probably shouldn't be an issue yet. It also depends on how much the heating tries to prevent the outdoor unit from icing up and consequently doesn't extract too much heat from the surroundings. (Einstellungssache)

During the day it was around 4 degrees here these days and at night around 0 degrees.