A so called "expert" that was talked to on one of the live streams covering it said no gas and it would have used boilers in the basement or something and radiant heat? no idea if its right or not.
Yeah that sounds about right, they either use communal heating systems with thermostats and valves in each flat or electric heating systems in each flat. Normally no gas supply to the actual flats for cookers etc.
But who knows? I've googled about it and it says a new heating system was installed, which leads me to belive it's a communal system.