Simplex kettles are manufactured to the highest standards combining the virtues and traditions of Victorian design and elegance with the innovations of modern technology. Simplex still follows the original 1903 mission statement, "to manufacture by hand, the highest quality kettles, consistently and without doubt produce the finest craftsmanship available."
When the lid is correctly fitted, which takes time to learn, and snapped in firmly, the kettle will whistle. If you have steam escaping from around the lid, then it is not correctly in place. You should be able to lift the kettle by the lid when it is in place. The kettles, when new, always whistle loudest with the whistle hole in the cap facing the spout. When you shake the kettle you should hear a ball rattle in the spout. Fill to the water line, fit the cap correctly, and the kettle will boil and whistle.
8-1/2" diameter x 10" H, with a 2 quart capacity