Experiences with heating costs/hot water preparation: gas vs. air-to-water heat pump

For our new building, in principle, either an air-to-water heat pump or a gas heating system is an option. To get a rough idea of the monthly expenses for heating/hot water, I would like to start a kind of survey. I am aware that the costs vary greatly depending on usage, hot water consumption, desired temperature, local conditions, etc. Nevertheless, I am interested in the following data:

[*]Heating costs per year
[*]Heating technology (gas, air-to-water heat pump, underfloor heating or radiators, with or without solar thermal ...)
[*]House size
[*]Wall construction (wall thickness, aerated concrete, Poroton or similar, insulation)

Around 600 per year. Gas. Solar thermal. 108 sqm bungalow. KfW basic. Ytong 30 monolithic.