ᐅ Heat Pump in a KfW 70-Energy Standard House Using Household Electricity?

seb79 schrieb:
... whether it is even allowed to operate a heat pump using a standard household electrical connection.

From what I understand, it is indeed possible to operate a heat pump with a regular household electrical connection. Ours was initially, partly mistakenly, connected to the household line and after a few phone calls, at my request, it was switched to the correct connection.

What would be the objection to running the heat pump on the more expensive household connection?

Hello,

seb79 schrieb:
...we are planning to build a KfW-70 house with an air-source heat pump, heat recovery, and photovoltaic system. The photovoltaic system will probably be sufficient to balance the electricity consumption for the air-source heat pump and household electricity in the calculation. We will also partially use the electricity ourselves.

That can definitely make sense.

seb79 schrieb:
...Since we don’t know if it is worthwhile to use a special heat pump tariff with a separate meter and basic fee for the small amount of electricity we still need to purchase externally for the air-source heat pump, 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 utility company’s tariff conditions. It is not uncommon that a heat pump tariff is required. ;-)

Best regards

Hello Seb79,

In principle, the heat pump can be operated with regular household electricity; however, using a special heat pump tariff is recommended.

Considering that the photovoltaic system only generates electricity during the day and that this energy is either not stored or stored with difficulty, while the highest consumption (lighting, television, etc.) occurs mainly at night, it makes sense to feed all the generated electricity into the grid. You receive a favorable feed-in tariff from the energy provider and purchase the cheaper grid electricity in return.

Overall, an energy consultant or specialized engineer should be involved in the overall planning to economically assess the cost-benefit aspects. It is quite possible that their conclusions will be very different and that the concept for a KfW 70 standard looks completely different. Alongside renewable energy sources, fossil fuels such as gas may also play a role.

During the planning phase, the user (you), the architect, and the specialized engineer/energy consultant should sit together (keyword: integrated planning). The installation of a solar collector system might also be interesting for domestic hot water production and heating support. There are already roof areas that consist entirely of solar and photovoltaic surfaces, into which roof windows can also be integrated. This can reduce the need for traditional roofing materials and also improves the appearance.

Best regards,

Erik