Hi Ethel.
Unless you can get rid of the calcium bicarbonate in your water supply (by using some form of 'water softening', which is not the same as 'filtering'), any kettle will suffer from limescale. However the limescale will be concentrated around the hottest points of the kettle. With an electric kettle, that means around the element (which can lead to early failure of the kettle). With a hob kettle the limescale forms mainly on the base of the kettle, which slightly impairs the heating efficiency but doesn't result in any drastic failure.
If you want to stick to using an electric kettle, the simplest and cheapest solution is to buy cheap kettles. A 'Value' cordless jug kettle, from Tesco, will cost you less than a fiver, and it will do the job just as well as a �70 stainless steel model.
Chris