| Value | Category | Cases | |
|---|---|---|---|
| 1 | Central heating system | 10180 |
22.6%
|
| 2 | Low pressure stove | 1585 |
3.5%
|
| 3 | Electric heaters | 293 |
0.7%
|
| 4 | Fire stove | 32984 |
73.2%
|