In Germany, electric heating for the house is very uncommon (in opposite to France, I think) for the reason that in Germany, electricity is rather expensive.
If I understand correctly from other comments below, Belgium seems to use this form of heating despite having some of the highest prices for electricity [0]. Is that the case?
And yes, it is expensive (for a 2 floor house with electric heating including water, total electricity was in the 3-4K Euros per year range). I assume there's no viable alternative for the particular buildings. Usually the rent is substantially lower for those houses (I lived in houses where the rent was lower than the nebenkosten+electricity for this exact reason).
[0] https://ec.europa.eu/eurostat/statistics-explained/index.php...
You extrapolated from "common in my city" to "common in my country", and a fairly large one at that. That isn't contrasting anything; its just plain wrong.