Which is more energy efficient for heating baby bottles: turning on the hot water and waiting?

I like to think that the old fashion way of boiling the kettle and pouring it into a jug is the best way to heat a baby's bottle. This would be suitable if it was formula but if it is cow's milk why not just heat the milk in a saucepan and pour it into the bottle. As long as we are not heating any baby's bottles in the microwave itself, I think all ways would be just as energy efficient.

And of course safety should always rule over efficiency!

Microwave a cup of water and dip the bottle into it.

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