Photovoltaic system air-water heat pump - profitability single-family house KFW55EE

You still have to divide that by four, then you have the power consumption. Just sayin'...

How am I supposed to understand that? Are the energy or heat demand calculations always given significantly too high, or am I calculating incorrectly? I had taken the Qp value.

Heat pump produces on average 4kwh of heat with 1kwh of electricity

Thank you. Can the heating electricity consumption of a new building roughly be derived using the Qp value from the heat demand calculation (KfW application) or does this calculation not make sense at all?

Usable area 270 sqm * Qp 35 kWh (per m2 per year) = 9450 kWh pa / 4 = approx. 2500 kWh pa.

That seems far too little to me.

There are many factors now (mainly the sanitary), but roughly that fits.

Thank you. Can you roughly estimate the heating electricity consumption of a new building using the Qp value from the heat demand calculation (KfW application), or does that calculation not make sense? Usable area 270 sqm * Qp 35 kWh (per m2 per year) = 9450 kWh pa / 4 = approx. 2500 kWh pa. That seems way too little to me.

Although it doesn't really have much to do with the topic of photovoltaics + air-water heat pump, 2500 kWh is not that unlikely. However, I find the Qp hard to interpret, since often some other values are included to derive the energy. For electricity something with 2. So better look at the heating load than the primary energy demand.

As much as I regret it, the annual performance factor does not matter here in my opinion. What counts is the final energy demand (which is also included in the calculations). This is the real electricity flowing through meters and systems. The QP value is the final energy multiplied by a politically motivated factor. As far as I know, this factor is currently 1.6 for heat pumps. That means actual electricity consumption would be:

Usable area 270 sqm * Qp 35 kWh (per m2 per year) = 9,450 kWh/a. Divided by 1.6 = 5,906 kWh/a (or about 22 kWh/a per m2 of usable area)

This value includes heating, hot water, ventilation as well as auxiliary energy (pumps etc). do you find the final energy in your documents, and does it correspond to my bold claim?