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You'll always save time with an electric kettle — it's likely to be better-insulated, have a lid, and the heating element is in contact with the water. It will still take 4-5 minutes though, even with a powerful kettle.

In case you're not familiar with them, we're discussing something like [1], or, to show these are very widespread commodity appliances, [2], which costs $7 including tax.

[1] http://www.amazon.co.uk/Andrew-James-Cordless-Indicator-Warr...

[2] http://www.argos.co.uk/static/Product/partNumber/9016710.htm