Value | Category |
---|---|
01 | No fuel used |
02 | Utility gas from underground pipes serving neighborhood |
03 | Bottled, tank, or liquefied petroleum gas |
04 | Electricity |
05 | Fuel oil, kerosene, other liquid fuels |
06 | Coal or coke |
07 | Wood |
08 | Solar energy |
09 | Other |
99 | NIU (not in universe) |