There are a variety of features to consider when buying a stainless steel kettle. You want to make sure that you're buying a model that is built to last. For instance, you may not want to buy one that is made of lightweight plastic. A high-quality stainless steel kettle should be durable and lightweight. You should also choose a stainless steel kettle that comes with a lifetime warranty. A whistling kettle can be a great addition to your kitchen, but it's important to choose one that's safe to use and won't leach chemicals into your water. You can check out the quality of a whistling kettle by looking for its whistle and the volume of the sound. You might want to buy one that's louder, as loud whistles are often safer for the elderly and people with children. If you're not sure, you can also try a whistling kettle demo. A Whistle kettle is a kettle that produces sound when you force air through it. The sound that is produced is a combination of two different types of sounds. The first is a sonic pulse caused by the steam. This wave produces a sound called Helmholtz resonance, which produces the first tone, and the second is a rippled column of turbulence, which produces the final tone.