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We like Instant Nescafe' coffee so I have to heat water in the kettle to make it. I know it is beginning to boil when I hear that high pitched shrill whistle. The water needs to boil a little more to get it really hot so to soften the noise, I stick a toothpick in the whistle hole. After reducing the heat, I remove the toothpick and put it aside to use next time.
Smart! I got rid of mine because it was too irritating. I should've done this. :)
Attosa, you will have to try it again. I love my whistling kettle.