| 1990 | 2015 | 2016 | 2017 | ||
|---|---|---|---|---|---|
| Total Water Heater Stock (thousands) | 956.9 | 1,645.5 | 1,678.6 | 1,731.2 | |
Water Heater Stock by Building Type (thousands) | |||||
| Single Detached | 590.2 | 1,007.8 | 1,018.6 | 1,040.8 | |
| Single Attached | 106.3 | 219.8 | 227.5 | 240.3 | |
| Apartments | 219.9 | 350.8 | 364.8 | 380.8 | |
| Mobile Homes | 40.4 | 67.1 | 67.8 | 69.3 | |
Shares (%) | |||||
| Single Detached | 61.7 | 61.2 | 60.7 | 60.1 | |
| Single Attached | 11.1 | 13.4 | 13.6 | 13.9 | |
| Apartments | 23.0 | 21.3 | 21.7 | 22.0 | |
| Mobile Homes | 4.2 | 4.1 | 4.0 | 4.0 | |
Water Heater Stock by Energy Source (thousands) | |||||
| Electricity | 63.8 | 124.0 | 127.8 | 133.3 | |
| Natural Gas | 872.2 | 1,478.2 | 1,505.7 | 1,550.3 | |
| Heating Oil | 8.7 | 19.0 | 19.9 | 21.0 | |
| Steam | 0.0 | 0.0 | 0.0 | 0.0 | |
| Other1 | 12.1 | 21.0 | 21.7 | 23.0 | |
| Wood | 0.0 | 3.3 | 3.4 | 3.6 | |
Shares (%) | |||||
| Electricity | 6.7 | 7.5 | 7.6 | 7.7 | |
| Natural Gas | 91.2 | 89.8 | 89.7 | 89.6 | |
| Heating Oil | 0.9 | 1.2 | 1.2 | 1.2 | |
| Steam | 0.0 | 0.0 | 0.0 | 0.0 | |
| Other1 | 1.3 | 1.3 | 1.3 | 1.3 | |
| Wood | 0.0 | 0.2 | 0.2 | 0.2 | |