yes, the 8000kWh are to be attributed to the heating per year
This is not normal. Not normal at all. That is the consumption of a pure electric heater, not a heat pump. A third would be more expected. How big is the house? 600 sqm?
A controlled residential ventilation system often does not pay off in the wallet, but is "luxury". You simply don't have to ventilate by hand anymore, which is necessary in new buildings due to the tight envelope.
You build the house tight and then happily open the windows wide every day instead of recovering it through a cross heat exchanger, very smart.