not done it yet
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Depends. First on the kettle size, secondly on how filled it might be - and to an extent, of the tariff charge and kettle construction.
Electricity can be free (some suppliers even pay the customer to use electricity, at times). There are also different night-time and day-time rates - some being variable depending on time of use. Cost per unit can, therefore vary between better than free up to about 35p/ unit.
That means that a large kettle, full of water, could cost as much as 7p to bring it to the boil. My typical usage (with ~250ml of water in my small 1kW kettle) will consume just over 0.5p worth of leccy at 17p/unit in the ~1min 50 seconds it takes to come fully to the boil. That is about 115kJ required including the water equivalent of the kettle and sundry thermal losses while heating.
When I want a hot drink, I don’t use a huge kettle, full of water for one mug of near boiling water.
Any domestic PV generation would, of course, very much reduce the small kettle heating cost.
