| 2000 | 2017 | 2018 | 2019 | 2020 | 2021 | ||
|---|---|---|---|---|---|---|---|
| Total Water Heater Stock (thousands) | 1,641.2 | 2,072.7 | 2,107.3 | 2,143.6 | 2,182.0 | 2,223.2 | |
Water Heater Stock by Building Type (thousands) | |||||||
| Single Detached | 886.2 | 1,013.5 | 1,021.2 | 1,028.8 | 1,035.3 | 1,042.8 | |
| Single Attached | 174.1 | 259.5 | 264.7 | 269.9 | 275.3 | 281.9 | |
| Apartments | 518.7 | 728.5 | 749.8 | 772.4 | 797.8 | 823.8 | |
| Mobile Homes | 62.2 | 71.1 | 71.7 | 72.6 | 73.6 | 74.6 | |
Shares (%) | |||||||
| Single Detached | 54.0 | 48.9 | 48.5 | 48.0 | 47.4 | 46.9 | |
| Single Attached | 10.6 | 12.5 | 12.6 | 12.6 | 12.6 | 12.7 | |
| Apartments | 31.6 | 35.1 | 35.6 | 36.0 | 36.6 | 37.1 | |
| Mobile Homes | 3.8 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | |
Water Heater Stock by Energy Source (thousands) | |||||||
| Electricity | 678.4 | 871.8 | 896.5 | 917.1 | 938.8 | 961.8 | |
| Natural Gas | 910.5 | 1,153.3 | 1,162.5 | 1,177.3 | 1,193.1 | 1,210.1 | |
| Heating Oil | 31.6 | 26.5 | 25.9 | 26.0 | 26.1 | 26.1 | |
| Steam | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
| Other1 | 8.0 | 13.2 | 14.7 | 15.6 | 16.5 | 17.5 | |
| Wood | 12.7 | 7.9 | 7.7 | 7.6 | 7.5 | 7.6 | |
Shares (%) | |||||||
| Electricity | 41.3 | 42.1 | 42.5 | 42.8 | 43.0 | 43.3 | |
| Natural Gas | 55.5 | 55.6 | 55.2 | 54.9 | 54.7 | 54.4 | |
| Heating Oil | 1.9 | 1.3 | 1.2 | 1.2 | 1.2 | 1.2 | |
| Steam | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
| Other1 | 0.5 | 0.6 | 0.7 | 0.7 | 0.8 | 0.8 | |
| Wood | 0.8 | 0.4 | 0.4 | 0.4 | 0.3 | 0.3 | |