| Value | Category | Cases | |
|---|---|---|---|
| 1 | central heating | 64 |
0.8%
|
| 2 | own system | 440 |
5.6%
|
| 3 | other (stove, electric heater, fireplace etc.) | 7300 |
92.7%
|
| 4 | no heating | 68 |
0.9%
|