Some kettles let you choose a temperature. Others show a temperature. A few do both, and the difference is easy to miss when shopping from a photograph.
For green tea, I would begin with the amount of water you usually need and the temperatures on your tea packets. Those two details narrow the choice more usefully than a long list of preset names.

Five features to check before buying
| Feature | Question to ask |
|---|---|
| Temperature range | Can it reach the temperatures your teas actually use, or only a few fixed presets? |
| Minimum fill | How much water must be inside for safe operation? Check the manual, not just the maximum capacity. |
| Pour and grip | Can you hold it comfortably and pour into your smallest pot without splashing? |
| Display | Does the number mean the target temperature or the current water temperature? |
| Cleaning | Can you reach inside, and are the maker's descaling instructions straightforward? |
A gooseneck gives a controlled stream, but it is not a requirement for green tea. A well-behaved ordinary spout may fill your teapot perfectly well. Try the grip in a shop if you can, especially if a full kettle feels heavy.
Does keep-warm mean “boil, then cool”?
No. A hold function maintains a selected temperature; it does not by itself promise a cooling cycle or an alert when boiled water cools. If that particular sequence matters to you, look for it explicitly in the manual.
For example, Bonavita describes heat-and-hold and adjustable temperature for its variable-temperature model. Those features are not the same claim as “automatically boil, cool and beep.” This is an example of reading specifications, not a recommendation to buy that model.
A small-batch check
If you need 150 ml for a small pot and a kettle's manual requires at least 500 ml, you must heat at least 500 ml. The example numbers are illustrative; check the actual model. Never underfill to make the arithmetic work.
A tiny gaiwan for green tea and a family teapot create very different demands. For several little infusions, think about how much water remains after each pour before turning the kettle on again.
Do you need to replace your ordinary kettle?
Not necessarily. A suitable kitchen thermometer can help you check water as it cools. If you prefer fewer gadgets, see brewing green tea without a thermometer, remembering that a fixed waiting time cannot guarantee an exact temperature.
Start with safe drinking water and follow any local water advisories independently of your tea recipe. For flavor questions, tap, filtered and bottled water for green tea is the more useful place to begin. A new kettle cannot answer every water problem.
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