| Value | Category | Cases | |
|---|---|---|---|
| 1 | Dont Know | 2 |
0.1%
|
| 2 | Electric powered heater/cooker | 7 |
0.2%
|
| 3 | Gas | 3660 |
97.2%
|
| 4 | None | 2 |
0.1%
|
| 5 | Oil (e.g. furnace oil) | 18 |
0.5%
|
| 6 | Other | 1 |
0%
|
| 7 | Refuse to answer | 1 |
0%
|
| 8 | Wood | 73 |
1.9%
|