Is the cloud solution also sensible alongside a power storage system?

Heat pumps have at least the potential to be cheaper than gas. With us, the running costs are a few hundred euros lower than they would be with gas. The economic efficiency depends particularly on the price charged for the installation. Here too, the heat pump can be cheaper than gas, but it can also become significantly more expensive. For efficient operation, planning is crucial. Otherwise, I am with Bookstar.

Regardless of which heating system, the underfloor heating must be planned for a low flow temperature in order to be able to switch energy sources later.

A craftsman additionally recommends a storage system for production peaks. This would result in a self-sufficiency rate of about 50% over the year.

Yes, the self-sufficiency rate indeed increases, but unfortunately the total costs also rise. Storage systems for electricity are still far too expensive to pay off.

I think you should calculate and get offers for a more down-to-earth system. Gas condensing boiler and that's it. Unless you have too much money and want to spend it on technical gimmicks.