Value | Category |
---|---|
1 | Collective central heating |
2 | Individual central heating based on gas |
3 | Individual central heating based on another fuel (coal, wood, petrol, etc.) |
4 | Stoves (tiled stove using wood, coal, sawdust, etc.) |
5 | Electric heating (accumulative) |
8 | Unknown |
9 | NIU (not in universe) |