| 2000 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total Water Heater Stock (thousands) | 3,147.2 | 3,669.1 | 3,706.8 | 3,743.9 | 3,775.1 | 3,810.0 | 3,847.1 | 3,886.4 | 3,926.8 | 3,969.9 | 4,020.3 | |
Water Heater Stock by Building Type (thousands) | ||||||||||||
| Single Detached | 1,443.8 | 1,670.5 | 1,682.0 | 1,691.5 | 1,699.3 | 1,706.9 | 1,714.4 | 1,721.5 | 1,728.0 | 1,734.6 | 1,745.4 | |
| Single Attached | 236.6 | 297.2 | 301.7 | 305.9 | 309.8 | 314.0 | 318.8 | 323.5 | 328.2 | 333.1 | 339.0 | |
| Apartments | 1,426.5 | 1,657.2 | 1,678.7 | 1,701.9 | 1,721.1 | 1,744.3 | 1,768.9 | 1,796.2 | 1,825.4 | 1,856.8 | 1,890.3 | |
| Mobile Homes | 40.4 | 44.2 | 44.4 | 44.6 | 44.8 | 44.9 | 45.1 | 45.2 | 45.3 | 45.4 | 45.6 | |
Shares (%) | ||||||||||||
| Single Detached | 45.9 | 45.5 | 45.4 | 45.2 | 45.0 | 44.8 | 44.6 | 44.3 | 44.0 | 43.7 | 43.4 | |
| Single Attached | 7.5 | 8.1 | 8.1 | 8.2 | 8.2 | 8.2 | 8.3 | 8.3 | 8.4 | 8.4 | 8.4 | |
| Apartments | 45.3 | 45.2 | 45.3 | 45.5 | 45.6 | 45.8 | 46.0 | 46.2 | 46.5 | 46.8 | 47.0 | |
| Mobile Homes | 1.3 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 | 1.1 | 1.1 | |
Water Heater Stock by Energy Source (thousands) | ||||||||||||
| Electricity | 2,773.6 | 3,412.9 | 3,468.6 | 3,520.6 | 3,564.5 | 3,609.8 | 3,655.5 | 3,701.7 | 3,744.7 | 3,789.8 | 3,841.6 | |
| Natural Gas | 175.5 | 139.2 | 140.0 | 140.7 | 141.0 | 141.4 | 141.7 | 142.1 | 143.0 | 144.0 | 145.2 | |
| Heating Oil | 186.4 | 100.3 | 82.8 | 68.4 | 56.3 | 46.3 | 38.1 | 31.4 | 28.1 | 25.2 | 22.7 | |
| Steam | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
| Other1 | 0.5 | 1.5 | 1.7 | 2.0 | 2.3 | 2.7 | 3.0 | 3.4 | 3.6 | 3.9 | 4.1 | |
| Wood | 11.2 | 15.2 | 13.6 | 12.2 | 10.9 | 9.8 | 8.8 | 7.8 | 7.4 | 7.0 | 6.6 | |
Shares (%) | ||||||||||||
| Electricity | 88.1 | 93.0 | 93.6 | 94.0 | 94.4 | 94.7 | 95.0 | 95.2 | 95.4 | 95.5 | 95.6 | |
| Natural Gas | 5.6 | 3.8 | 3.8 | 3.8 | 3.7 | 3.7 | 3.7 | 3.7 | 3.6 | 3.6 | 3.6 | |
| Heating Oil | 5.9 | 2.7 | 2.2 | 1.8 | 1.5 | 1.2 | 1.0 | 0.8 | 0.7 | 0.6 | 0.6 | |
| Steam | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
| Other1 | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | |
| Wood | 0.4 | 0.4 | 0.4 | 0.3 | 0.3 | 0.3 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | |