What is left to do when no gas is available and a deep drilling is not allowed and would also make no sense? Near-surface geothermal energy is not an option? Then there is only the air-to-water heat pump.....
What else is there really when no gas is available and a deep drilling is not allowed and wouldn't make sense either? Shallow geothermal energy is not an option? Then only the air-water heat pump remains.....
Also good - then you don't have to decide [emoji6]
Oil heating in new buildings? Anyone who seriously plans that.... Gas by tank is often very expensive and usually only pays off as a replacement for oil in existing buildings.