| 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total Water Heater Stock (thousands) | 4,467.4 | 4,534.1 | 4,613.0 | 4,686.7 | 4,768.7 | 4,847.1 | 4,918.7 | 4,980.6 | 5,045.4 | 5,098.1 | 5,156.8 | 5,214.2 | |
Water Heater Stock by Building Type (thousands) | |||||||||||||
| Single Detached | 2,521.4 | 2,560.9 | 2,605.8 | 2,649.9 | 2,695.5 | 2,735.9 | 2,772.9 | 2,806.5 | 2,838.1 | 2,860.2 | 2,884.8 | 2,906.7 | |
| Single Attached | 628.1 | 647.9 | 666.1 | 682.6 | 701.1 | 717.7 | 733.9 | 748.6 | 762.4 | 774.8 | 786.9 | 799.0 | |
| Apartments | 1,293.0 | 1,300.5 | 1,316.2 | 1,329.2 | 1,346.9 | 1,368.1 | 1,386.4 | 1,399.9 | 1,419.2 | 1,437.4 | 1,459.2 | 1,482.7 | |
| Mobile Homes | 24.9 | 24.8 | 24.9 | 25.0 | 25.2 | 25.4 | 25.5 | 25.6 | 25.7 | 25.8 | 25.8 | 25.9 | |
Shares (%) | |||||||||||||
| Single Detached | 56.4 | 56.5 | 56.5 | 56.5 | 56.5 | 56.4 | 56.4 | 56.3 | 56.3 | 56.1 | 55.9 | 55.7 | |
| Single Attached | 14.1 | 14.3 | 14.4 | 14.6 | 14.7 | 14.8 | 14.9 | 15.0 | 15.1 | 15.2 | 15.3 | 15.3 | |
| Apartments | 28.9 | 28.7 | 28.5 | 28.4 | 28.2 | 28.2 | 28.2 | 28.1 | 28.1 | 28.2 | 28.3 | 28.4 | |
| Mobile Homes | 0.6 | 0.5 | 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 | 1,295.1 | 1,288.3 | 1,286.5 | 1,271.6 | 1,253.4 | 1,246.5 | 1,240.3 | 1,266.7 | 1,282.1 | 1,290.8 | 1,309.4 | |
| Natural Gas | 2,968.9 | 3,051.6 | 3,146.4 | 3,216.7 | 3,308.1 | 3,408.0 | 3,473.1 | 3,531.7 | 3,574.0 | 3,602.0 | 3,659.1 | 3,703.8 | |
| Heating Oil | 132.5 | 137.4 | 128.6 | 127.5 | 131.1 | 126.7 | 133.3 | 137.2 | 136.2 | 141.7 | 136.4 | 127.3 | |
| Steam | 0.0 | 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 | 20.3 | 20.2 | 22.8 | 23.5 | 24.0 | 26.8 | 29.6 | 29.9 | 33.6 | 35.9 | 41.0 | |
| Wood | 25.7 | 29.7 | 29.5 | 33.3 | 34.3 | 35.0 | 39.0 | 41.7 | 38.7 | 38.7 | 34.7 | 32.7 | |
Shares (%) | |||||||||||||
| Electricity | 29.6 | 28.6 | 27.9 | 27.4 | 26.7 | 25.9 | 25.3 | 24.9 | 25.1 | 25.1 | 25.0 | 25.1 | |
| Natural Gas | 66.5 | 67.3 | 68.2 | 68.6 | 69.4 | 70.3 | 70.6 | 70.9 | 70.8 | 70.7 | 71.0 | 71.0 | |
| Heating Oil | 3.0 | 3.0 | 2.8 | 2.7 | 2.7 | 2.6 | 2.7 | 2.8 | 2.7 | 2.8 | 2.6 | 2.4 | |
| Steam | 0.0 | 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 | 0.4 | 0.4 | 0.5 | 0.5 | 0.5 | 0.5 | 0.6 | 0.6 | 0.7 | 0.7 | 0.8 | |
| Wood | 0.6 | 0.7 | 0.6 | 0.7 | 0.7 | 0.7 | 0.8 | 0.8 | 0.8 | 0.8 | 0.7 | 0.6 | |