Magnetrons are a lot less efficient than magnetic induction (which most modern electric kettles use). Magnetic induction is about 90% efficient at converting electricity to heat in the vessel, whereas the most efficient microwaves are about 60% efficient at converting electricity to microwaves.
But isn’t it more efficient in the microwave, since you’re only heating the water, not the vessel?
Magnetrons are a lot less efficient than magnetic induction (which most modern electric kettles use). Magnetic induction is about 90% efficient at converting electricity to heat in the vessel, whereas the most efficient microwaves are about 60% efficient at converting electricity to microwaves.
So, if you don’t have an induction stove, nor a kettle…?
Yeah. Microwaves are more efficient than most non-induction stoves.