| Value | Category | Cases | |
|---|---|---|---|
| 1 | Central heating system | 43 |
1.6%
|
| 2 | Electric heater | 1 |
0%
|
| 3 | Boiler | 43 |
1.6%
|
| 4 | Fire stove | 2538 |
96.6%
|
| 6 | Other (specify) | 1 |
0%
|
| 9 | Missing | 0 |
0%
|
| Sysmiss | 24 |