When our facility was built, on-demand hot water was incorporated into the sinks, with the tiny little water heater unit housed in a locked cabinet unerneath the sink. It has a separate spigot from which they can get either boiling hot water or very hot water. These have worked very well, but over the years some have broken and not been replaced. I suspect that our maintenance folks didn't like to mess with them. In their place, we have hot water pots like yours, which bring a whole rash of problems. I recommend going with an on-demand under the cabinet unit, other than needing ocassional maintenance, it eliminates problems with tampering and can't be used as a weapon.
Lt. Sharon Willits
Sedgwick County Detention Facility
Wichita, KS 67031
(316) 383-7279