@proedie are you sure about that? https://insideenergy.org/2016/02/23/boiling-water-ieq/ seems to suggest otherwise.
Even though the 500ml used in above test is about double of a cup, I find it difficult to imagine that that volume difference would be enough to overcome the energy efficiency difference of 50% for the microwave vs the 80% efficiency of an electric teakettle.
Though being able to wait for the water to boil may be more efficient in the long term since I don't risk forgetting I have put the kettle on 😂
But perhaps switching to an induction stove with a 'traditional' kettle with a whistle may solve that by needing to turn off the source of the noise 😅
@virbonus @kc @fesshole

What is the most energy efficient way to boil water? And which method has the smallest carbon footprint? The familiar act of boiling water lets us examine how the choices we make daily roll up to global energy consumption.