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Electric heat comparison to fossil fuels
Propane:
- Propane produces 91,500 BTU's of heat per gallon.
- 80% efficient furnace produces 73,200 BTU's wasting 18,300 BTU's per gallon.
91,500 / 73200 = 1.25 gallons
1.25 gallons required to accomplish 91,500 BTU's
- 1.25 gallons x $1.75 / gallon = $2.18 per 91,500 BTU's
Electric:
- Electric is 100% Efficient
- At 3412 Btu's per 1 KWH
91,500 BTU's / 3412 BTU's = 26.82 KWH
26.82 KW x .038 cent per Dual Fuel Rate = $1.02 to accomplish 91,500 BTU's
Savings:
$2.18 cost of propane per 91,500 BTU's.
$1.02 cost of off-peak electric per 91,500 BTU's.
$1.16 per 91,500 Btu's purchased saved.
Savings per heating value of one gallon of propane
for different electric prices
100%
Efficient
Electricity |
80%
Efficient
Propane | | |
90%
Efficient
Propane | | |
80%
Efficient
Fuel Oil | | |
| Electric | Propane | Elec. | Savings | Propane | Elec. | Savings | Oil | Elec. | Savings |
| $.033/KW | $2.18 | $0.88 | $1.30/gal | $1.92 | $0.88 | $1.03/gal | $2.98 | $1.34 | $1.64/gal |
| $.038/KW | $2.18 | $1.02 | $1.16/gal | $1.92 | $1.02 | $0.90/gal | $2.98 | $1.54 | $1.44/gal |
| $0.05/KW | $2.18 | $1.34 | $.84/gal | $1.92 | $1.34 | $0.58/gal | $2.98 | $2.03 | $0.95/gal |
| $0.072/KW | $2.18 | $1.93 | $.25/gal | $1.92 | $1.93 | $0.01/gal | $2.98 | $2.93 | $0.06/gal |
The chart above reflects propane price at $1.75 per gallon and fuel oil prices at $2.49 per gallon.
Electricity=3412 Btu/KWH, Propane=91500 Btu/gallon and Fuel Oil=138500 Btu/gallon.
Use the formula below to estimate your cost for operating appliances:
KWH/Month = (Rated Watts) x (hours per day x 30) ÷ 1000
As an example: If a 1500 watt space heater was used 8 hours per day, the usage would be:
KWH/Month = (1500 watts) x (8 hrs. x 30 days) ÷ 1000
KWH/Month = 360 x .082 = $29.52 per month.
Note: If your appliance only lists the amps and voltage, use this formula to calculate the watts:
Watts = Amps x Volts
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