| Value | Category | 
|---|---|
| 1 | Alcohol/ethanol | 
| 2 | Gasoline/diesel | 
| 3 | Kerosene/paraffin | 
| 4 | Fire coal/charcoal | 
| 5 | Wood | 
| 6 | Straw/shrubs/grass | 
| 7 | Agricultural crop | 
| 8 | Animal dung/waste | 
| 9 | Processed biomass (pellets) or woodchips | 
| 10 | Garbage/plastic | 
| 11 | Sawdust | 
| 12 | Gas cylinder/cooking gas | 
| 96 | Other |