Enamel-on-Steel Loop Teakettle 1.8 quart,. The kettle's smooth, flat base features an aluminum core for efficient heat conduction and solid contact with the burner. The bottom is safe for use with ceramic, glass, and induction stovetops. You will know when the water is boiling once the harmonious whistle sounds its two notes. In addition, the kettle offers a spring-loaded, stay-open flipper that keeps your fingers away from the steam.