I found this information after doing a Google search ....
Wattage
Wattage refers to how much power the machine needs. While many believe that a higher wattage rating is needed to make an efficient machine, that’s not necessarily true. Sure, it’ll make popcorn fast. However, it will result in more unpopped kernels and more wasted energy.
Popcorn machines should be efficient. It needs to use power effectively to make the best popcorn possible. Just because a machine has a lower wattage doesn’t mean it’s inferior. In fact, it may mean that the machine is designed more strategically to ensure that energy isn’t wasted.
For home theaters, it’s good to look at machines that have around 600 watts. You can choose an option with more or less based on how fast you want a cycle completed and how power-efficient you need the machine to be.