More than 80% of households have a kettle in the UK, I would say 99%. That doesn't count businesses, shops or other places that will certainly also have a kettle.
We do love our tea.
We do love our tea.
Boy they got a lot of stick for that.
Another good use is dual-core boiling. When I need boiling water for cooking, I put some water in a pot and turn on the stove. But I also put water in my 2 kW electric kettle and will have boilng water within a few minutes.
But these days my kettle is almost solely used as a stand-by "tea making device" :)