Value | Category |
---|---|
01 | No central heating |
02 | Oil |
03 | Natural gas |
04 | Electricity |
05 | Coal (including anthracite) |
06 | Peat (including turf) |
07 | Liquid petroleum gas (LPG) |
08 | Wood (including wood pellets) |
09 | Other |
98 | Unknown |
99 | NIU (not in universe) |