The hot water here in Hoofddorp is cold water heated by gas. Maybe that is why sinks in most WCs only have one tap, a cold one. I had trained my self not to turn on the hot water tap unless I really wanted hot water but since I came from Iceland I find my self using the hot water tap by the kitchen sink without realizing until the water turns hot. This is of course waste of energy, energy costs money, and good Netherlanders don't spend money unless absolutely necessary.