| 2000 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total Water Heater Stock (thousands) | 4,467.4 | 5,269.4 | 5,324.8 | 5,377.9 | 5,447.1 | 5,507.3 | 5,572.8 | 5,659.8 | 5,743.2 | 5,841.5 | 5,947.1 | |
Water Heater Stock by Building Type (thousands) | ||||||||||||
| Single Detached | 2,521.4 | 2,930.1 | 2,950.3 | 2,970.2 | 2,987.5 | 3,008.1 | 3,033.5 | 3,073.6 | 3,121.4 | 3,172.9 | 3,224.4 | |
| Single Attached | 628.1 | 811.0 | 824.3 | 836.7 | 847.2 | 859.1 | 873.5 | 890.6 | 903.9 | 919.1 | 934.3 | |
| Apartments | 1,293.0 | 1,502.3 | 1,524.1 | 1,544.8 | 1,586.1 | 1,613.7 | 1,639.3 | 1,668.9 | 1,691.2 | 1,722.8 | 1,761.5 | |
| Mobile Homes | 24.9 | 26.0 | 26.1 | 26.2 | 26.3 | 26.4 | 26.5 | 26.6 | 26.7 | 26.8 | 26.9 | |
Shares (%) | ||||||||||||
| Single Detached | 56.4 | 55.6 | 55.4 | 55.2 | 54.8 | 54.6 | 54.4 | 54.3 | 54.3 | 54.3 | 54.2 | |
| Single Attached | 14.1 | 15.4 | 15.5 | 15.6 | 15.6 | 15.6 | 15.7 | 15.7 | 15.7 | 15.7 | 15.7 | |
| Apartments | 28.9 | 28.5 | 28.6 | 28.7 | 29.1 | 29.3 | 29.4 | 29.5 | 29.4 | 29.5 | 29.6 | |
| Mobile Homes | 0.6 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
Water Heater Stock by Energy Source (thousands) | ||||||||||||
| Electricity | 1,322.7 | 1,340.3 | 1,355.8 | 1,369.2 | 1,385.7 | 1,398.8 | 1,412.9 | 1,431.6 | 1,451.0 | 1,474.0 | 1,498.6 | |
| Natural Gas | 2,968.9 | 3,728.7 | 3,786.0 | 3,838.3 | 3,899.2 | 3,951.2 | 4,006.2 | 4,074.7 | 4,137.8 | 4,211.1 | 4,289.4 | |
| Heating Oil | 132.5 | 122.4 | 106.4 | 92.4 | 80.4 | 69.8 | 60.6 | 52.8 | 49.1 | 45.8 | 42.9 | |
| Steam | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
| Other1 | 17.6 | 47.4 | 52.5 | 59.0 | 66.9 | 75.8 | 83.9 | 93.4 | 98.9 | 105.0 | 111.2 | |
| Wood | 25.7 | 30.5 | 24.1 | 19.0 | 15.0 | 11.8 | 9.3 | 7.4 | 6.4 | 5.6 | 4.9 | |
Shares (%) | ||||||||||||
| Electricity | 29.6 | 25.4 | 25.5 | 25.5 | 25.4 | 25.4 | 25.4 | 25.3 | 25.3 | 25.2 | 25.2 | |
| Natural Gas | 66.5 | 70.8 | 71.1 | 71.4 | 71.6 | 71.7 | 71.9 | 72.0 | 72.0 | 72.1 | 72.1 | |
| Heating Oil | 3.0 | 2.3 | 2.0 | 1.7 | 1.5 | 1.3 | 1.1 | 0.9 | 0.9 | 0.8 | 0.7 | |
| Steam | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
| Other1 | 0.4 | 0.9 | 1.0 | 1.1 | 1.2 | 1.4 | 1.5 | 1.6 | 1.7 | 1.8 | 1.9 | |
| Wood | 0.6 | 0.6 | 0.5 | 0.4 | 0.3 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | |