I have a machine which has cold/warm/hot because it doesn't heat water by itself, it just takes whatever hot water there exists in the house (and "warm" means 50% hot water and 50% cold).
I still think anyone who grew up with such a machine would be able to graduate to a numerical temp knob without having a visceral reaction over the numbers every time they do laundry.
I still think anyone who grew up with such a machine would be able to graduate to a numerical temp knob without having a visceral reaction over the numbers every time they do laundry.