In , Stephen wrote:


What prevents the element from boiling the water if it is left on
forever? Did I read that they have a thermal cut out and that if
triggered they have to be sent back to the manufacturers to be reset
or have I misunderstood?


I'm pretty sure ours have proper thermostats inside them. I can hear
them clicking on and off while they're switched on, once the rail has
got up to temperature.

--
Roger Morton