Gas with solar thermal or heat pump? And possibly photovoltaics?

Thank you very much for all the feedback. It helps me a lot with further thinking. We will now have to clarify a few facts and obtain offers. Then we can take a closer look at everything. Thank you again for your responses. You have greatly helped us to see things more clearly.

Hello maybe you can help me. I want to install a gas heating system but with photovoltaics. Can you tell me if this is feasible with the Energy Saving Ordinance? Unfortunately, I can't find anything about it. What did you decide?

We are building monolithically with Poroton without an additional composite system

Hello maybe you can help me. I want to install a gas heating system but with photovoltaic. Can you tell me if this is feasible with the Energy Saving Ordinance? Unfortunately, I can’t find anything about it. How did you decide?

We are building monolithically with Poroton without an additional composite system

That won’t work. The Renewable Energies Heat Act requires a renewable share for hot water preparation/heating. You can only achieve this with photovoltaic if you use the generated electricity to run an electric heating element. Of course, that is uneconomical.

Is controlled residential ventilation with heat recovery available? That can also be an option.

Thank you for your feedback. Can't I then use the photovoltaic system for water heating as well as for private consumption..? Why is that less economical than solar thermal? A controlled residential ventilation system is currently not planned. However, it would be considered by me in combination with a gas system.

Generating one kWh of electricity using photovoltaics costs about 4 cents. If you use it yourself, it also costs about 4 cents in VAT. Additionally, you forgo the feed-in tariff of about 10 cents per kWh.
So ultimately, the kWh of photovoltaic electricity converted into heat by an electric heating element costs you about 18 cents.
One kWh of gas costs 5-6 cents, about a third.

Photovoltaic electricity - yes, gladly. But not converted 1:1 into heat, that would be foolish. Better to feed it into the grid; then you make a profit.

Hello maybe you can help me. I want to install a gas heating system but with photovoltaics. Can you tell me if this is feasible according to the Energy Saving Ordinance? Unfortunately, I can’t find anything about it. How did you decide? We are building monolithically with Poroton without an extra composite system.

Unfortunately, I can't really help with special questions about the Energy Saving Ordinance. We also relied on the information from our heating engineer. We have now decided on gas heating + potable water heat pump. No solar and initially no photovoltaics (but preparation). We also have a controlled residential ventilation system.