PetSafe Drinkwell® Original Pet Fountain
I have one Drinkwell along with 3 cats. I have found the noise from my fountain is due to the components vibrating. I could push down on the top lid for example, walk away, and stop the vibrations. However, the pump does do some humming. And as far as attracting cats to drink more; my 3 cats seem to like a fresh bowl of water with a couple of ice cubes in the dish. But I have one of my cats that will lay next to the Drinkwell Fountain and will drink fresh water when the pump is not plugged in.