Exorbitant power consumption house construction single-family house experiences

If you say the system has not been properly handed over yet: But it is already set up to some extent and is running in "normal mode" and not on the heating element for months?

The outdoor units are definitely running, I can't see when the heating element switches on.

Have the meter checked with the construction power. There are independent bodies for that.

That was also the first opinion of the lawyer but he also said that an uncalibrated meter is quite unlikely.

It feels like something is wrong with the heating or it ran too long.

And are you also sure that the heating element only supported the heat pump during the screed program? Or did the entire program only run on the heating element? Then, according to the calculation by , that would fit quite well.

Just as a side note:

Our pump Vaillant 75/5 has now pulled 2140kw with the screed program for a 100sqm kfw55 bungalow and previously over the construction power box an incredible 27kw in 6 months

To satisfy your monk:

Kwh

yes, I have an iSFP, it states Primary energy demand for the house: 37kWh/(m2a), is that then 13690 kWh?

expected final energy consumption 9,350kWh/a
I don't have any useful energy ;-)

Primary energy demand is only a virtual value; you will not find it on any bill or meter.
Final energy is then the electricity consumption for heating and hot water, excluding household electricity.
Primary energy = Final energy * Primary energy factor (electricity = 1.8)
so for you 9,350 kWh/a * 1.8 = 16,830 kWh
The 37 kWh/m²a does not refer to the 370 m², but to the energy reference area/useful area An. This is calculated a bit differently.
An = 1/3 * Ve with Ve = heated volume including exterior walls
For you, it should come out to 455 m², if I am not mistaken, because calculated backwards:
16,830 kWh/a divided by 37 kWh/m²a = 455 m²
It should be on page 1 of your demand calculation.

Useful energy would then be the heat demand your heat pump must supply to the house, after accounting for the environmental heat from the heat pump, so about 37,000 kWh.

But your energy consultant should be able to explain that to you, after all, they calculated it. And they should also be able to explain the deviation, so definitely record it first. For yourself and as a basis for argument with your heating technician and consultant.