One degree is equal to 1000 watt hours, which is 1000 watt hours × One hour, that is, if there is a water heater with a power of one kilowatt, the electric energy consumed by it for one hour is one degree.
One degree is equal to one kilowatt-hour, that is, 1000 watts× 1 hour, that is to say, if there is a water heater with a power of one kilowatt, the electric energy it consumes for one hour is one degree.