| Value | Category | Cases | |
|---|---|---|---|
| 1 | District heating by utility or boiler | 412 |
13.7%
|
| 2 | Own central heating system | 103 |
3.4%
|
| 3 | Separate heating devices | 2454 |
81.8%
|
| 4 | Other | 30 |
1%
|
| Sysmiss | 4 |