Passive house, heating combination with solar, energy recovery, photovoltaics?

You can use underfloor or wall heating. The building component activation is important here, as well as the entire geometry of the building.

Collector area for DV is max 1:1, so 160 sqm for a passive house.
But then it would already be a full-fledged heating system that you don't need at all.

Imagine your refrigerator but reversed, the back side is the heater, heat is being extracted.

And what do you say "parcus" about the solar system, advantageous or unnecessary due to the ground collectors?

The wall heating is more advisable since with underfloor heating the floor is warm but the dust is spread incredibly, although this might not be so much the case due to the comfort ventilation....

What kind of solar system are you talking about, photovoltaic or thermal?

I have already told you about the thermal system that you only save 100 to 200 euros per year. So almost no payback. It is like with ventilation systems, just additional comfort and you do something for your environment.

How many people are there?

I consider the dust thing a rumor, I have 350 sqm of white marble and only underfloor heating.

Okay, well what if I don’t want a ventilation system... Then rely entirely on earth collectors?

Although if I have a ventilation system with heat recovery, I don’t need such a large area of earth collectors.
I don’t know to what extent the costs balance out, but you also have to consider that the air is much better with the ventilation system without constant airing.
In a passive house without ventilation, how does that work? I have to air out every 2 hours, or how is air exchange supposed to happen?
Or how was your statement meant, is it like with ventilation systems?
They are necessary in the passive house for ventilation anyway.

So at the moment we are 3, 2 adults 1 child but another child is planned, possibly 2.

Only the solar thermal system is optional, not the ventilation system with heat recovery

okay, then there are at least 60 watts per person of heating power

How about the heating coil in the ventilation system, are they standard or are they optional as well?

If the ground collectors are sufficiently dimensioned, the heating coil is not necessary either, right?