At Fort Worden, I heated water the old-fashioned way. I filled the pot, flipped the top down and waited for the whistle. Ingenious ... but not foolproof. For instance, you could (and I did) forget to close the contraption. I quickly learned — no top, no whistle.
You could also (theoretically) leave the kettle on until the water vaporized and the pot was singed. But for that you would have to ignore the whistle, which is mighty difficult to do.
I'm glad to be back with my electric teakettle. But the whistling version is fun, too ... maybe the original smart appliance?