> If they're not meant to stay on how come most of them have clocks? Specifically so that the machine is not on until a set time. If you wanted the heating pa

> If they're not meant to stay on how come most of them have clocks? Specifically so that the machine is not on until a set time. If you wanted the heating pad to be perpetually on, there would be no need for a clock. The clock is so that you can have it start brewing later.