At our school, they were always turned on, but never used - always seemed like a waste of water. This was 15 years ago and an all boys school. Part of the problem, at least, is the shower area was just a cold concrete area with some overhead showers at a pre-set temperature.
At our school PE was always seen as a bit of a bonus/treat. If somebody had misbehaved, you'd all go off to a spare classroom and learn some theory on sport or something, so you got no exercise. I hated PE anyway, I was no good at football or rugby or any of the "winter" PE sports, I only liked athletics, basketball and tennis in the summer and tended to exert as little effort as possible and was never challenged on it.
At our school PE was always seen as a bit of a bonus/treat. If somebody had misbehaved, you'd all go off to a spare classroom and learn some theory on sport or something, so you got no exercise. I hated PE anyway, I was no good at football or rugby or any of the "winter" PE sports, I only liked athletics, basketball and tennis in the summer and tended to exert as little effort as possible and was never challenged on it.