In Reply to: My mother did that at my house once and posted by Charliebalibear on Sunday, 18. October 2015 at 07:28 Bali Time:
many of the cheapies have no thermostat or cut out device.
If they are turned on and forgotten, the water will boil away and the plastic casing will just collapse or catch alight.
If anyone really needs, perhaps better to get one with some sort of protective device at a slightly higher price.