Ventilation system in single-family house without effect = planning error?

Attached again is the power consumption, which has increased enormously since it has been below 0°C outside

Ok, as I already suspected, I had a wiring error with the power measurement sockets - the ventilation was connected behind the heater - which of course makes (no) sense o_O The heater therefore does not consume excessive power. According to the app, possibly 15-20% more than usual, which is completely fine. (about 0.8kWh per day) All the more I am annoyed about the power consumption of the ventilation system. :mad: They could have just worked with an air well or something similar, then this problem would probably be more or less history. Now the controlled residential ventilation currently consumes about 800-1000 watts during operation (at -12°C outside temperature). I reset the flow rate in normal operation back to (the factory-set) 150 m³/h, hoping that the air quality will not suffer too much, but the air quality meter will tell me... And my own nose should also "indicate" that Attached again is the power consumption, which has risen enormously since it has been below 0°C outside [ATTACH alt="Stromverbrauch_Lüftungsanlage_Tage.png"]57272[/ATTACH]

but something is wrong. Our preheating element currently shows 50W.

75 watt value according to the system or from the Fritz device?

but something is not right. Our preheating register currently shows 50W.