A Smart Kettle might make sense
Turn it on via phone. Tells you how much water is in it and ETA for when it will be hot.
When it's boiling it turns itself off then tells you via phone.
It reminds you 5 minutes later that you still have not used the water and asks if you want to re-boil.
But most of this Smart House stuff is crap. I'd rather they got on with developing the flying car we're supposed to all have sometime before 2000.