ᐅ Heating system concept for a new build based on gas

Hello everyone,

After reading quite a bit in the forum about different heating systems, I am increasingly convinced that I would like to install a gas condensing boiler. The concept of air source heat pumps does not convince me in cases of low temperatures, and ground or water source heat pumps are not allowed on the intended plot.

My current idea is as follows: gas heating + support for domestic hot water production through photovoltaic panels + a ventilation system with heat recovery.

The house will be about 150 sqm (1,615 sq ft). I have a few questions for you:

- Does this combination make sense?
- Why are solar thermal systems typically used? Do they have a better efficiency for water heating than photovoltaic? The advantage of photovoltaic would be that the electricity can also be used for other purposes...
- What about the costs? Is photovoltaic more expensive than solar thermal? How much does a ventilation system with heat recovery cost for a 150 sqm (1,615 sq ft) house?

Thanks in advance for your valuable help in this jungle.

Best regards,
Herr Stein