Heat pump in a Kfw-70 house with household electricity?

... whether it is even allowed to operate a heat pump via the regular household power connection.

My information is that it is definitely allowed to operate it with a normal household power connection. Ours was initially partially mistakenly connected to the household connection and was then switched to the correct connection at my request after several phone calls.

What would speak against the heat pump running on the more expensive household connection?

Hello,

...we are planning the construction of a KfW-70 house with an air heat pump, heat recovery, and photovoltaics. The photovoltaics will probably be sufficient to theoretically offset the electricity consumption for the air heat pump and household electricity. We will also partially use the electricity ourselves.

That can definitely make sense.

...Since we do not know whether it is worthwhile for the small amount of electricity that we still have to purchase externally for the air heat pump to use a special heat pump tariff with its own meter and basic fee, I wanted to ask whether a heat pump is allowed to be operated via the regular household electricity connection at all.

That always depends on the tariff conditions of the utility company. It is not uncommon that a heat pump tariff must be taken. ;-)

Best regards

Hello Seb79

Basically, the heat pump can be operated with regular household electricity, but the use of the special heat pump tariff is still recommended.

Considering the fact that the photovoltaic system only generates electricity during the day, which cannot or can only be stored with difficulty, but the greatest consumption (lighting, television, etc.) occurs at night, it makes sense to feed all the generated electricity into the grid. You receive the high feed-in tariff from the energy supplier and buy the cheaper grid electricity instead.

Overall, an energy consultant or a specialist engineer should be consulted in the overall design to economically evaluate the cost-benefit aspect. It is quite possible that they will come to completely different conclusions and the concept for a Kfw 70 will look entirely different. In addition to renewable energies, fossil energy sources such as gas can also play a role in this.

During the concept phase, the user (you), the architect, and the specialist engineer/energy consultant should come together (keyword: integrated planning). The installation of a solar collector system for water heating and heating support may also be of interest. There are already roof areas that consist entirely of solar and photovoltaic surfaces, in which roof windows can also be integrated. This can then save the roof covering, and it also looks better aesthetically.

Best regards

Erik