| Value | Category | Cases | |
|---|---|---|---|
| 1 | Central heating system | 175479 |
24.3%
|
| 2 | Low pressure stove | 21569 |
3%
|
| 3 | Electric heaters | 3279 |
0.5%
|
| 4 | Fire stove | 520628 |
72.2%
|
| Sysmiss | 3426 |