Small correction, the power company is paid for KW-hour, not per KW.
So you would pay say .07 (here in Louisville) to operate that 1000
watts for an hour. Or a 4800 Watt heater would cost 4.8* $0.07 per
hour, or about 34 cents to run for an hour, or $2.69 for the 8 hrs.

Jeff