Because the current requirements are constant and not like a photography flash just a short but extreme amount. There’s no point in putting a few Watt seconds into a capacitor if the power requirement is 2kW for minutes.
Plus
power storage is large
you need a way to transfer the stored power into the water faster (otherwise why bother), which means thicker coils and more wear
Because the current requirements are constant and not like a photography flash just a short but extreme amount. There’s no point in putting a few Watt seconds into a capacitor if the power requirement is 2kW for minutes.
Plus