I love this thing! I have two issues- one being that my son keeps turning the heat up when I'm not around lol.
The only real issue is that the button does tend to stick, so that the water does not turn off reliably. I have been able to pop it or pry it up. I have tried to lubricate it. Our water has lots of minerals and I am wondering if that is the cause. It is not a big deal. Just don't stick your hand in the water while you are trying to turn it off!