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

So I plan to have a house built for my family in not too long. We/I have decided on a passive house because I don’t want to harm the environment and want to live cost-effectively regarding utility costs. Now I am wondering which heating combinations I will/should use. So a comfort ventilation system with heat recovery is a must... For hot water, the sun is used in combination with a large buffer. Now I thought the heat recovery might not be enough to heat the house to the temperature I want... What do people recommend as additional sources? Geothermal? Also sun for auxiliary heating? Or what are the possibilities? Or maybe the comfort ventilation with heat recovery is enough? You hear everywhere passive houses don’t need additional heating, heat recovery should be sufficient, is that true? And I thought I’d put some photovoltaic panels on the roof to save even more and minimize the energy costs of the electrical devices and fan motors of the comfort ventilation system etc... What do the specialists think, which combination is recommended and will cause no problems, e.g., that it won’t be warm enough or so. Many thanks for your help PS: Hello to everyone, I’m new here :D

Hello Bunnyguard,
what budget do you have for your house construction?

yeah

So, all in all, without the property, I wouldn’t want to exceed the 300,000 euro mark.
I think that’s enough to realize our dream.
My parents have a few properties, so that doesn’t weigh so heavily anymore.

Hello Bunnyguard First of all, congratulations on your decision to build a passive house. Depending on the requirements for the living area, the budget is completely sufficient. However, keep in mind that the construction of a passive house should only be planned by a suitably qualified architect and, very importantly, the construction should be continuously supervised. Regarding the question of additional heating: Depending on the type, the ventilation system contains an electric heating coil. This is sufficient to heat the living area even during persistent frost. Due to the low energy demand of a passive house, the electricity costs remain moderate. An elegant solution is the installation of an adjustable pellet stove, with which I can generate the necessary additional energy for hot water preparation via the buffer storage tank. Best regards Timo Bertrams

hm. Yes, well my father is a construction manager, but apart from that I still wanted to involve an outsider who objectively examines the property.

Regarding the heating, is it not possible to heat through a geothermal probe or through the buffer that is powered by the sun? Because I wanted to avoid a conventional stove, and the solution with electric reheating through the comfort ventilation is certainly the simplest, cheapest, and most elegant solution, no extra space needed, etc.

But the word electricity (heating) doesn't please me at all. Is it not also possible to use the buffer powered by solar energy, for example, for hot water preparation, to draw something off and heat in between with it? I think you don't have to keep reheating constantly even if it is really very cold. Because once it is heated, it also lasts quite a long time, I think, without having to add heat for days on end.

PS: The only thing I could possibly imagine would be to heat additionally through a fireplace if that would work, my wife is really into that :D But whether that is technically feasible, no idea, that's why I am here... Whether you need something extra for the fireplace or if it is enough when it heats the air and it goes through the comfort ventilation through the house... questions upon questions...

Don't get me wrong, but consulting an expert is not enough when planning a passive house. Designing a house without heating is a task for a specialist. Of course, you can store summer heat in large long-term storage units to use it through the winter. The question is whether the effort and the result still provide a reasonable price-performance ratio. The same applies to geothermal probes and heat pumps (which also consume a lot of electricity). The electricity for the heating element can also be covered by solar panels. An open fireplace is obviously not possible because a passive house must be airtight. However, the pellet stove can stand in the living room as it draws its supply air from the chimney.