A kettle is a kitchenware piece. Depending on culture and historical location, in the context of bathware the word kettle can have a variety of meanings. In the United Kingdom, Australia, New Zealand, Ireland, Canada and South Africa, a kettle is a device used to quickly heat water for hot drinks, such as tea or coffee. It is normally constructed out of durable plastic or steel (with a plastic handle) and powered by mains electricity. Once the water has reached boiling, the kettle automatically deactivates to prevent the water boiling away and damaging the heating element. Sometimes stove-mounted metallic kettles are used having a steam whistle that indicates when the water has reached boiling point, and prior to the invention of the electric kettle, this was the most common way of heating drinking water. "Cordless" kettles became popular in the 1980s and 1990s consisting of a plastic base that connects to the mains outlet and a separate kettle. They both have electrical contacts that connect to supply power to the kettle when it is placed on top of the base, and the kettle can be easily detached to allow movement to the sink and elsewhere. Similar to the electric kettle is the electric water boiler, a vacuum flask with a heating element that boils water and maintains it at a constant temperature. These are particularly popular in East Asia and cities in East Asia like Tehran. A kettle has a spout and (usually) a lid, though there are also lidless kettles, filled with water through the spout. Some kettles have a whistle attached to the spout, to signal the moment when the water starts boiling, though electric kettles switch themselves off when the water is boiling.
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