This Enamel Whistling Kettle is made by Austria by Riess & Co. It has the traditional rounded shape, but has been specifically designed with a large base, so that the water heats up with the minimum amount of energy. It is actually more energy-efficient than an electric kettle. The kettle gives out a loud whistle when the water boils.
It is finished in white enamel and costs £46.40 from Manufactum.