| Value | Category |
|---|---|
| There is no piped hot water in a dwelling | |
| 1 | There is a hot piped water heated outside the dwelling (in power stations or boilers) |
| 2 | There is a hot piped water heated inside the dwelling (on electric or gas stove, or in a boiler) |
| 8 | Unknown |
| 9 | NIU (not in universe) |