A glass kettle will transfer heat very quickly when boiling water. As a result, consumers should always be aware of how hot a kettle can be when heating up. The best kettles of any material will whistle when they reach a boiling point. This allows the user to know that their water is sufficiently heated up, and is also a nice sound to hear emanating from one's kitchen. Some glass kettles will not have the necessary accoutrements to make a whistle - these devices should be considered more ornamental. Each kettle should have a removable lid as well, to help facilitate the flow of water into the device. This means there will be no spillage when filling or pouring from the kettle. The handle of the kettle should also be sturdy. It should preferably not be made of glass, or metal, if it does not have a rubber covering. This is to ensure the kettle will not burn any user's hand.
There are two main types of glass kettles. Some resemble the sort of kettle seen on a coffee pot, although they are usually larger and more sturdy. These types can be used with most types of ovens or in the microwave to heat up. They are usually simply designed, and can be made in a variety of different shapes and sizes. Tea infusers are often sold as an attachment, for drinkers of the beverage. There are also electric glass kettles, which have different selling points. The main use of these kettles is that they can be filled with water then plugged in, and the electricity will produce heat in the kettle system. The water will eventually heat up, and the kettle may whistle, light up, or do nothing, depending on the manufacturer. These kettles are somewhat more expensive than non-electric counterparts, because they require wiring to use. Many of them cannot be used without the plug-in function, as they will not heat water when on a stove or in a microwave. Still, they do allow for more speed and convenience than their manual counterparts.
Picking a glass kettle does not have to be an all-day task. If a buyer has an idea in mind for price, they can simply browse websites or go to a store to pick out which is right for them. Once one knows whether they want electric or non-electric, the decision becomes much easier.