Is an extra meter necessary for the heat pump if a photovoltaic system is present?

Only one meter for photovoltaics.
Correct decision.
Unless the photovoltaic system has more than 9.9 kWp power, then a 100% meter from the supplier is generally required only for the photovoltaics.

Thank you for the feedback. Our system has exactly 9.92 to stay under ten. What do you think of the solution with two meters, where you take the heat pump electricity tariff and at the same time operate the heat pump with photovoltaics? That should partly already be possible.

Yes, why not. If it’s worth it with you.

I admit, I sometimes no longer understand the combination options, but I think I know that not every electricity provider agrees to the issue with two meters. It is probably the local suppliers that are decisive, not the pure providers. At least that is how I understood our photovoltaic installer.

Yes, the measurement concept must be enabled by the grid operator. It has nothing to do with the electricity tariff.

Thank you, network operator. That word was missing for me.