"Smart kettle" covers three quite different things, and they get sold as one. Temperature control, app connectivity and keep-warm are separate features with separate price tags, and most kitchens only genuinely benefit from one of them.
Here is what each does, what it costs you, and the honest test for whether it earns its place.
The three things people mean
1. Variable temperature control
The kettle heats to a temperature you choose rather than always to boiling. Usually a set of presets between about 40°C and 100°C.
This is the one worth having, if you drink the right things. Boiling water genuinely damages delicate teas and over-extracts some coffee:
- Green tea wants about 70 to 80°C. Boiling water makes it bitter and grassy, which is why a lot of people think they dislike green tea.
- White tea wants about 75 to 85°C.
- Oolong sits around 85 to 95°C.
- Pour over and filter coffee want roughly 92 to 96°C, just off the boil.
- Black tea, builder's tea, instant coffee, anything with a teabag and milk want a full 100°C rolling boil.
If everything you make is in that last line, temperature control does nothing for you at all.
2. App connectivity
The kettle joins your wifi and you start it from your phone.
The pitch is boiling the kettle from bed. The catch is that you still have to have filled it the night before, and water that has sat overnight in a warm kitchen is not what most people want in their first cup. In practice most owners use the app for a fortnight and then go back to the switch.
It also adds a failure mode a kettle has never had: a firmware update, an app that stops being supported, a router change that orphans the device.
3. Keep-warm
The kettle holds the water at temperature for 20 to 60 minutes after boiling.
Genuinely useful if you make several drinks across a morning, because you skip the reboil each time. The cost is that it is drawing power to hold that heat, so it only saves energy if you would otherwise have boiled again. Leave it holding all morning for one extra cup and you have spent more, not less.
What it costs
A good conventional kettle and a smart one do exactly the same core job. The premium buys you the features above, not a better boil. Nothing about being smart makes a kettle faster, quieter or more efficient at heating water, and a smart kettle scales up in hard water exactly like any other, so you will still be descaling it on the same schedule.
The honest test
Three questions. If you answer no to all three, a smart kettle is money spent on a feature you will not use.
- Do you drink green, white or oolong tea, or make pour over coffee? If yes, temperature control is a real upgrade and the only feature here that changes the drink in your cup.
- Do you make three or more separate drinks across a morning, at least an hour apart? If yes, keep-warm may save you reboils.
- Will you genuinely use your phone to start a kettle you have already filled? Be honest. Most people will not.
The cheaper way to get most of it
If the only yes is the first one, you do not necessarily need a smart kettle. Boil normally and let the water stand: roughly 3 minutes off the boil in an open mug lands near 80°C, and 1 minute lands near 90°C. Not precise, but free, and plenty for most green tea.
What matters far more than any of this for the average household is not overfilling, which is worth about £57 a year, and that is a feature of the water window rather than the electronics.
Where we stand
The Toastley 1.7L kettle is not a smart kettle. It boils and switches itself off. We would rather say that plainly than stretch the word: it has 2200W rapid boil, a concealed element, a washable filter and a water window you can read, and no temperature presets, no app and no keep-warm.
If you drink a lot of green tea, buy something with temperature control. If you drink builder's tea, you would be paying for a screen. The rest of what makes a kettle good to live with is in our guide to choosing one.
Common questions
Is a smart kettle worth it?
Only if you drink tea or coffee that wants water below boiling, or you make several drinks spread across a morning. For standard black tea and instant coffee it adds cost without changing the result.
What temperature should green tea be?
Around 70 to 80°C. Boiling water scalds the leaves and makes it bitter.
Do smart kettles use more electricity?
Boiling costs the same. Keep-warm does use extra power to hold the temperature, so it only saves energy if it prevents a reboil you would otherwise have done.
Can you get water off the boil without a smart kettle?
Yes. Boil as normal and wait. About a minute in an open mug gets you near 90°C and about three minutes near 80°C.