Large Capacity Large 1.5L capacity can make up to 6 drinks at a time. One Cup Boil To allow you to boil only one cup at once if you choose, thereby saving you energy. Easy View Water Window Dual water window so you can easily view how much water is in your kettle, from either side. Limescale Filter Removable limescale filter so you can be sure you have a quality hot drink, free of limescale.