Blew my mind living in a Berlin apartment, that the heating & hot water was managed centrally for the entire block (not the apartment block, the whole city block). Too used to Anglo cities where everyone does for themselves.
(seriously though, I knew they had hot water, it just never occurred to me how awesome it is to have hot water on the tap)
Also gas pipes to every home isn't a thing in many countries.
Only about 2% of the total heating used though...