• Electric cost is determined by kilowatt hour use (kw/hr). For example: a 1500 watt engine heater uses 1.5 (one and one half) kilowatt hour of electricity (1500 watt = 1.5 kilowatt). • If your electrical cost is $0.10 per kilowatt hour use, a 1500 watt engine heater would cost $0.15 (15 cents) per hour to operate. ($0.10 x 1.5kw/hr). • Multiply that 15 cents by the number of hours used per day, and that is cost of operation. 10 hours / day: ($0.15 / hour) x (10 hours) = $1.50 • Your local utility provider can give more detailed information or call J.Jeb Customer Service.