It really isn't. A gas heater costs 1500-2500 euro with installation. Especially when just switching the previous one with a new one, it can be done really quickly and cheaply.
Switching to a heat pump can be anywhere from 10-25k depending on the existing plumbing, size of heat pump etc.
Switching to a heat pump can be anywhere from 10-25k depending on the existing plumbing, size of heat pump etc.