I'm not sure if he just can't drink from a running tap and prefers the water to run off his nose, or if he just likes water running on his head. Even with a full tub of water he still chooses the water on his head!
Poor guy! He's thirsty. He just ahsn't learned that if you tip your head sideways you can lap the water without getting your head all wet. Aya's figured this out...