Total........................................................................... 111.1 78.1 64.1 4.2 1.8 2.3 5.7

Number of Water Heaters

1.............................................................................. 106.3 74.5 60.9 4.0 1.8 2.2 5.5

2 or More................................................................. 3.7 3.3 3.0 QQQQ

Do Not Use Hot Water............................................ 1.1 0.3 Q Q N Q Q

Housing Units Served by Main Water Heater

One Housing Unit.................................................... 99.7 76.2 63.7 4.1 1.3 1.6 5.6

Two or More Housing Units..................................... 10.3 1.5 Q Q 0.5 0.7 Q

Do Not Use Hot Water............................................ 1.1 0.3 Q Q N Q Q

Main Water Heating Fuel

Electric.................................................................... 43.1 29.5 22.8 1.0 0.4 1.3 3.9

For One Housing Unit.......................................... 40.3 28.8 22.6 1.0 0.4 0.9 3.9

For Two or More Housing Units........................... 2.7 0.6 Q N Q 0.4 N

Natural Gas............................................................. 58.7 41.8 35.5 2.9 1.3 0.9 1.2

For One Housing Unit.......................................... 52.5 41.0 35.5 2.9 0.9 0.7 1.2

For Two or More Housing Units........................... 6.2 0.8 Q Q 0.4 0.3 N

Fuel Oil................................................................... 4.0 2.8 2.5 Q Q Q N

For One Housing Unit.......................................... 3.0 2.8 2.5 Q Q N N

For Two or More Housing Units........................... 1.1 QQQQQN

Propane/LPG.......................................................... 4.0 3.4 2.9 Q N N 0.5

Other....................................................................... 0.2 Q Q NNNN

Do Not Use Hot Water............................................ 1.1 0.3 Q Q N Q Q

Age of Main Water Heater

Used by One Housing Unit

Less than 2 Years............................................... 14.7 11.9 9.9 0.5 0.3 Q 0.9

2 to 4 Years......................................................... 18.6 15.4 13.0 0.8 0.2 0.3 1.1

5 to 9 Years......................................................... 25.5 21.5 17.8 1.0 0.4 Q 2.0

10 to 19 Years..................................................... 20.1 16.8 14.3 0.9 Q Q 1.1

20 Years or More................................................. 6.8 4.8 4.0 0.4 Q Q Q

Don't Know.......................................................... 12.0 5.0 3.9 0.3 Q Q 0.4

No Separate Water Heater.................................. 1.9 0.9 0.7 Q N Q N

Used by Two or More Housing Units

Less than 2 Years............................................... 0.3 Q N Q Q Q N

2 to 4 Years......................................................... 0.5 Q Q N Q Q N

5 to 9 Years......................................................... 0.5 0.2 QQQQN

10 to 19 Years..................................................... 0.6 Q Q N Q Q N

20 Years or More................................................. 0.6 Q N N N Q Q

Don't Know.......................................................... 4.4 0.4 Q N Q 0.2 N

No Separate Water Heater.................................. 3.4 0.4 N N Q Q N

Table HC3.8 Water Heating Characteristics by Owner-Occupied Housing Unit, 2005

 OwnerOccupied 

Housing 

Units 

(millions)

Type of Owner-Occupied Housing Unit

U.S.

Housing 

Units 

(millions

Single-Family Units Apartments in 

Buildings With--

Water Heating Characteristics Detached Attached 2 to 4 

Units

5 or More 

Units

Mobile 

Homes

 Million U.S. Housing Units

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characterisics Tables
Table HC3.8 Water Heating Characteristics by Owner-Occupied Housing Unit, 2005

 OwnerOccupied 

Housing 

Units 

(millions)

Type of Owner-Occupied Housing Unit

U.S.

Housing 

Units 

(millions

Single-Family Units Apartments in 

Buildings With--

Water Heating Characteristics Detached Attached 2 to 4 

Units

5 or More 

Units

Mobile 

Homes

 Million U.S. Housing Units

Size of Main Water Heater

Used by One Housing Unit

Small (30 gallons or less).................................... 17.1 11.2 7.7 0.5 Q 0.7 2.1

Medium (31 to 49 gallons)................................... 52.4 40.6 34.2 2.4 0.7 0.5 2.8

Large (50 gallons or more).................................. 27.1 22.5 20.1 1.0 0.3 Q 0.7

Tankless water heater......................................... 1.1 1.0 0.9 Q Q N Q

No Separate Water Heater.................................. 1.9 0.9 0.7 Q N Q N

Used by Two or More Housing Units

Small (30 gallons or less).................................... 1.4 Q Q N Q Q Q

Medium (31 to 49 gallons)................................... 2.4 0.4 QQQQN

Large (50 gallons or more).................................. 2.8 0.6 Q Q 0.3 0.2 N

Tankless water heater......................................... 0.2 Q Q N N Q N

No Separate Water Heater.................................. 3.4 0.4 N N Q Q N

Other Water Heating

Hot Tubs or Spas.................................................. 6.7 6.5 6.2 Q N N Q

Electricity............................................................. 5.3 5.1 4.9 Q N N Q

Natural Gas......................................................... 1.2 1.2 1.2 NNNN

Swimming Pools................................................... 1.9 1.9 1.9 N N N N

Natural Gas......................................................... 1.2 1.2 1.2 NNNN

Electricity............................................................. 0.4 0.4 0.4 NNNN

Propane/LPG....................................................... 0.3 0.3 0.3 NNNN

Some Other Fuel................................................. Q Q Q NNNN

Electric Water Beds.............................................. 2.2 2.0 1.6 Q N Q Q

1.......................................................................... 1.9 1.7 1.4 Q N Q Q

2 or More............................................................. 0.3 0.3 Q N N N Q

Heaters Used all Year.................................... 1.7 1.6 1.3 Q N Q Q

1................................................................... 1.5 1.3 1.0 Q N Q Q

2 or More...................................................... 0.3 Q Q N N N Q

 Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or fewer than 10 households were sampled.

 N = No cases in reporting sample.

 Notes: ● Because of rounding, data may not sum to totals. ● See Glossary for definition of terms used in these tables.

 Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2005 

Residential Energy Consumption Survey.

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characterisics Tables