When choosing a whistling tea kettle, you should keep a few things in mind. Not all models come with pre-packaged filters, and these can be difficult to find at your local grocery store. Another thing to keep in mind is that a whistling tea kettle's filter isn't interchangeable with those used in other types of infusers.

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.