Well electricity costs around 0.30€ per kWh and you need at least 4-6kw to heat that area and a heat pump that produces the same amount of heat uses 1-1.2kw of electricity . And well a fireplace is under heavy regulation here in Germany because of the dust and emissions.

Having held my ear against a finished wood floor to listen for the leak, I concur. I'm sure there's a good way to do this, but I've only seen bad ways.