When doing the dishes by hand in the kitchen sink, with our single faucet tap expelling hot water from the mixer, my wife decides to fill the electric kettle to boil water for a coffee or pot of tea or whatever.
She insists on running the tap until cold water comes out then proceeds to fill the kettle.
Then I have to run the tap again to get hot to come out so I can finish the dishes.
I tell her that shes wasting heat energy and water by doing this.
She claims that there is a valid reason to use cold water for the kettle.
Whos right?