Central heating is a f*cking retarded idea - heating the whole house when the simple fact is an individual can only use one room at a time.
Some people ACTUALLY LIVE WITH OTHER PEOPLE. Also, you really don't know what central heating is or how it works. I have zones. Valves only allow the hot water to enter the zones where the thermostat is calling for heat.
Radiators in the halls - WTF is that for?
That's for not having it 59 degrees in the halls while it is 69 in the rooms, resulting in possible frozen pipes (in older buildings that can't be as well insulated) or condensation on the walls. Only old buildings have radiators. Newer ones with hydronic heating use baseboards (or underfloor radiators), and you usually only see them in hallways if there's an outside wall or it's a very, very long hall with a high ceiling.
You probably should realize there are a few things like HVAC which you think are simple, but perfectly intelligent people had to study in great detail to master.