Amazon shoppers like a kettle that keeps water hot for 30 minutes and saves energy. The Ninja Perfect Temperature kettle is on sale, reduced from £99.99 to £59. It comes in a sleek matte black color and has a digital display.

The Ninja kettle has a base with a digital display that shows the temperature. It has six pre-set temperatures from 60°C to 100°C that can be selected with a button.

The kettle has a 1.7L capacity, which is enough for seven cups of tea or coffee. It boils in under 50 seconds, which is faster than most kettles.

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The kettle has a function that keeps the water temperature for up to 30 minutes. This is great for people who need a hot water top-up or want to make a second drink without re-boiling.

Other smart kettles are available, like Lakeland's Digital Double-Walled Kettle for £44.99 and Bosch's Styline Variable Temperature Kettle for £60. These kettles have temperature adjustment systems and keep warm functions.

The Ninja Perfect Temperature Kettle has six pre-set temperatures from 60°C to 100°C.

The limited-time deal on the Ninja kettle is a good one, especially with £40 off. Users have given it rave reviews, praising it as 'one of the best' with a 4.6-star rating.

One user left a five-star review, saying Ninja products are always good. They bought the kettle after seeing it in action and don't regret it.

The user has had the kettle for a month and likes it. It boils quickly, within seconds or a couple of minutes, depending on the water amount.

The user likes the temperature selector, especially for making matcha at 80°C. The kettle holds the temperature for up to 30 minutes, which is perfect for getting distracted.

Another user likes the kettle, saying it heats water fast and has good temperature control. It's perfect for making coffee, tea, or anything that needs a specific heat level.

The user likes the build quality, which feels premium. The stainless steel design looks great, and the handle is comfortable. The display is clear, and the controls are easy to use.

The user also likes how quiet the kettle is, saying it's powerful but doesn't sound like a jet engine. The keep-warm function is a great bonus, especially when multitasking.

Some users were disappointed with the kettle's longevity, saying it leaked after a few years. One user said the temperature sensor stopped working after 13 months.

Most users are impressed, saying the kettle boils in seconds and helps save money. One user said it's great for saving power, as it can heat water to a set temperature without boiling.

The user likes the kettle, saying it saves money by reducing boil time. If the kettle is used throughout the day, the saved minutes add up to save money.