Gas heating + photovoltaics possible without proof

Hello, I have a question and urgently need your expertise.

We are planning a new building in monolithic construction. Poroton 36.5 without thermal insulation composite system.

Now I would like to install a gas heating instead of an air heat pump. Unfortunately, my architect's energy program from 2016 only offers the option of a solar thermal system. This way the energy saving ordinance is fulfilled. For me, however, solar thermal is unfortunately an obsolete model and I would prefer gas with photovoltaic. Allegedly, this should be possible with a gas heating system and 10 m^2 photovoltaic without proof...

Can someone tell me more precisely or give me a tip on where I can officially read about this?

The calculations of the various options currently resulted in for our house...

1. With air heat pump
Primary energy demand is 36.2 kWh/m2*a and
corresponds to KFW efficiency house 55.

2. Variant: Gas + solar + ventilation system, the
primary energy demand is 45.1 kWh/m2*a
and corresponds to KfW efficiency house 70.

3. Variant: Gas + ventilation system, the
primary energy demand is 58.10 kWh/m2*a
the efficiency house is 82.1% and proof not provided.

4. Variant Gas with solar thermal
the primary energy demand is 52.9 kWh/m2*a, requirement value 53.1 --> energy saving ordinance fulfilled

Of course, I would prefer only a gas system with a central ventilation system with heat recovery....

Where is the problem? That the program does not work? The solutions do exist.

If we only accelerate with a central ventilation system, the value unfortunately will not be reached.

The value for funding or the legally required value? One can forgo funding if one wants. We ourselves have a non-fundable system and are outside the KFW guidelines. We simply wanted it that way and then just did it that way.

Search engine: "Photovoltaic system Energy Saving Ordinance", directly the first pdf.

Otherwise, with gas and controlled residential ventilation you only have 4 adjustment options:

1) Improve insulation
2) "Tune" the stored values (the DIN calculates with outdated values, which are actually exceeded by modern systems)
3) Optimize the system technology (shorter/better insulated pipes, installation location in the heated area, etc.)
4) Tap alternative "energy sources" (e.g. shower pipe or stove)