Cost per million BTU's, delivered

Oil

Cost per gallon

50% efficiency

70% efficiency

85% efficiency

$0.80

$11.76

$8.40

$6.92

$1.00

$14.71

$10.50

$8.65

$1.25

$18.38

$13.13

$10.81

$1.50

$22.06

$15.76

$12.98

Efficientcies for oil equipment range from 50% for lower-efficiency water heaters to 85% for the best oil furnaces and boilers. Older boilers typically have seasonal efficiencies around 70%

Propane

Cost per gallon

50% efficiency

75% efficiency

90% efficiency

$1.00

$21.39

$14.26

$11.88

$1.25

$26.74

$17.83

$14.85

$1.50

$32.09

$21.39

$17.83

$2.00

$42.78

$28.52

$23.77

$3.00

$64.18

$42.78

$35.66

Natural Gas

Cost per ccf or therm

50% efficiency

75% efficiency

90% efficiency

$.070

$14.00

$9.33

$7.78

$0.85

$17.00

$11.33

$9.44

$1.00

$20.00

$13.33

$11.11

Efficientcies for propane & natural gas equipment range from 50% for lower-efficiency water heaters to 80%-85% for typical new furnaces and boilers, and90% for condensing furnaces and boilers.

Electricity

Cost per kWh

90% efficiency

100% efficiency

200% & 300% efficiency

$0.05

$16.28

$14.65

$7.32 / $4.88

$0.08

$26.04

$23.44

$11.72 / $7.81

$0.11

$35.81

$32.23

$16.11 / $10.74

$0.15

$48.83

$43.95

$21.97 / $14.65

Efficientcies for electrical equipment range from 90% for older water heaters & 95% for new water heaters to 100% for resistance heating, 200% for typical heat pumps, and 300% for the highest-efficiency ground-source heat pumps, depending on particular equipment & climate.