jug

When cooking, boil water in the jug first, then transfer to the pot on the stove.

The jug is more efficient in heating up the water as it is enclosed and designed for the job,

To cut down on the expensive boiling of the jug/kettle, why not measure out the number of cups you need (plus a bit extra to cover the heating element) by actually pouring the cup(s) into the jug.

don't boil 2 liters of water when you only want 1 cup of tea. Jugs are big power users.

The electric jug is one of the "high user" electric appliances in the home and is very widely used.

Pour left over boiling water when making a cuppa into a thermos. The next time you or someone in your household wants a cuppa, just make it from the still hot water.