Our approximately 6 month old hot water cylinder has started boiling more often than it should. i.e. it will boil and then stop and then five minutes later, boil again.
As it is under warranty, we rang the place of purchase who then contacted a plumber. The plumber then rang my partner and he told her that it could be leak, but I am suspecting a thermostat problem.

If there is anyone here clued up on HW cylinders, why would the cylinder be boiling often, especially when there is no filling of it going on, as you can tell the difference in filling and boiling.