Cost of Using Electric vs. Natural Gas Booster Heater
Using rates from October 2006, here is an example of how much money was saved for a business that uses 1000 gallons per day and is open 312 days per year.
Variables
1,000

Gallons of hot water per day (GPD)

312
Days of operation per year
90
Increase in water temperature (degrees)
80%
Water heater efficiency
$ 0.46
Cost per therm of natural gas ($/therm)
$ 0.08
Electric charge ($/kWh)
8.33
Pounds per gallon
3413
BTUs per kWh
Annual Electric Cost: $5,482.72

Annual Gas Cost: -$1,345.04
_________________________
Annual Savings: $4,137.68

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Total Annual Electric Cost
$ 5,482.72

Annual Electric Cost (Electric use x electric charge)

68,534
Annual Electric Use (BTU consumption/ 3413)

Total Annual Natural Gas Cost
$ 1,345.04

Annual Natural Gas Cost (Therm use x cost per therm)

233,906,400
Annual BTU Consumption (GPD x days of operation x 8.33 x temperature rise)
2,924
Annual Therm Use (BTU consumption/100,000/water heater efficiency)