Energy saving regulation with gas boiler and heat recovery ventilation instead of solar?

Hello,

is it also possible, instead of solar, to achieve the "alternative" energy through heat recovery in a central ventilation system when using a gas boiler, or does it have to be solar?

Thank you

We were even able to build according to the KfW55 standard. Of course, corresponding insulation is assumed.

It's doable. You need to talk to the developer.

Is it not advisable for cost reasons? I mean the solar heat is only for water - and I have read that one uses about 1000l of water per year per person - is it worth it? Or is it better to choose solar later because of possibly higher energy prices? The central system with heat recovery also costs something

Just one experience. Move-in 11.9. Heating instruction 20.10. I did not touch the heating before. The service technician said 20.10., oh, the hot water is still off. Has the solar system managed that alone? Yes, let's say, we could always shower with warm water. That's that. Carsten

Hi,
personally, I find a ventilation system with heat recovery more reasonable.
It is an investment that can pay off throughout the year.
Solar can only be used on sunny days and is also high in terms of investment.

Is gas used for heating?