The whistle sound produced by a whistling teapot is based on the same mechanism as that of an organ pipe or flute. The length of the spout determines the pitch of the sound; a shorter spout produces a higher pitch and a longer spout makes a lower pitched whistle.

Stainless steel is the safest material for a tea kettle. It is non-aluminum and rust-resistant. This type of tea kettle is popular in many venues, including restaurants and hotels. Look for a whistle that sounds like a tin can when the tea is ready. It should last a long time. Made in the USA is a good indicator of value.

Choosing a whistling kettle can be a daunting task. Not only do you need to consider the size, but also the material it is made from. Many of the best options are manually operated and have a capacity of one to three liters. The best whistling tea kettles are made of stainless steel or aluminum alloy and feature ergonomic handles that are safe for elderly people or children to hold.