Best energy efficient kettles for 2025: save money on your electricity bills

Our guide to the best energy-efficient kettles will help you to avoid a wasteful boiler with our Best Buy recommendations and expert buying advice.

To be energy efficient, a kettle should have a low minimum fill, ideally 300ml or less, so you only boil the water you actually need for a single cup.

It should also switch off immediately after boiling. Our tests reveal that some kettles overboil terribly, continuing for up to 30 seconds more than they need to and is a waste of energy.

To see all the kettles we recommend, see our kettle reviews.

Best energy efficient kettles for 2025

Here are our picks of the top energy-efficient kettles from our tests.

Which? members can log in to see our pick of the best energy-efficient kettles. If you're not a member, join Which? to unlock the results of our rigorous testing.

Energy-efficient kettles by type

• Energy-efficient glass kettles
• Energy-efficient metal kettles
• Energy-efficient plastic kettles

Energy efficient kettles by price

• Energy-efficient kettles under £20
• Energy-efficient kettles under £30
• Energy-efficient kettles under £40
• Energy-efficient kettles under £50

Why you can trust our kettle reviews

We never take samples from brands. We buy every single kettle we test – that means no 'free samples'.

Our independent lab puts each kettle through a series of rigorous tests to find out how well it performs. To ensure impartiality and comparability, the kettles are acclimated to the ambient conditions overnight before testing starts.   

Testing checks for things such as energy consumption, how quickly the kettle boils and how long it takes to switch off once the water reaches 100°C. We also look at whether you can boil just one cup of water, as well as how easy it is to use, clean and descale.

These unbiased tests root out the kettles that are quick to boil, easy to use and don't waste energy. These are our Best Buys.

Read more about how we test kettles.

Where to buy an energy efficient kettle

Don't land yourself in hot water by buying the wrong kettle. Here are some retailers than stock those that we've found to be energy efficient.

• Amazon stocks thousands of kettles, so be sure to check our reviews before you buy. Brands include Breville, Haden and Russell Hobbs. Orders of £35 or more of eligible items qualify for free delivery in the UK. Or if you're an Amazon Prime member, standard delivery is free no matter what your kettle costs.
• AO lists energy-efficient models predominantly by Morphy Richards, Russell Hobbs and Smeg, with prices starting from under £30 and going up to almost £200. Delivery and availability varies by your location, so check before you order.
• Robert Dyas has stores primarily in the south of England or you can order online. Free delivery is available for orders over £30 to most of the UK mainland when you use the code FREEDEL30 at checkout. Otherwise, standard delivery costs £3.95 for orders under £30. This excludes delivery to the Scottish Isles, Isle of Man, Isles of Scilly and Isle of Wight.
• Very offers kettles from brands including Ninja, Philips and Russell Hobbs. Standard Click & Collect delivery is free on orders of £30 or more (£3 charge for orders under £30). Standard delivery costs £3.99.
• Wayfair stocks models from KitchenAid, Russell Hobbs and Tower, but read our reviews before you commit. Shipping varies depending on the size of your order and where you live. Delivery is free on orders over £500.
  
  Delivery prices and terms may change.

Can you buy an eco-friendly kettle?

Unlike some larger appliances such as dishwashers and washing machines, only a small portion of a kettle's environmental impact comes from day-to-day use. You can make a big difference by opting for a kettle that will last you a long time before it needs replacing.

If you want to make a sustainable choice, buy a kettle that boils quickly and has a low minimum fill. This means you don't waste energy boiling water you don't end up using, which is better for the planet and your pocket. 

Sadly, just because a kettle is 'sustainable' doesn't necessarily mean it's a good all-around model. But that's where Which? Eco Buy kettles come in. 

To become an Eco Buy, a kettle must:

• Score at least 65% in our tests
• Achieve five stars for speed of boiling
• Have a minimum fill of 275ml or less
• Have an overboil time of less than five seconds
• Come from a brand that achieves a good longevity rating in our annual reliability survey.

Fewer than 10% of the kettles we test are sustainable enough to be Eco Buys.

To find the most sustainable models, head to our kettle reviews and use the Eco Buy filter. 

Do fast kettles use more energy?

It's a common misconception that if a kettle boils faster, it must use more energy. However, we've found that isn't the case. 

In fact, most of our Eco Buys have the recommendation because of their speedy boiling. If a kettle is able to reach a boil in around three minutes, it will use far less energy than one that takes four or five minutes.

But while we have tested kettles that can boil a litre of water in less than two minutes 30 seconds, we've also come across models that take almost four minutes, so there could be a big difference between two products sitting next to each other on a shelf.

If you're looking to cut down your energy bills, you're better off choosing a fast kettle as it will likely save you money in the long run. 

Do note that just because a kettle scored well in the speed element of our tests, doesn't necessarily mean it's a good all-round model. Some of the fastest we've reviewed and rated are nearly Don't Buys, as they scored poorly on our tests, so be sure to read our full reviews before making your final decision.

To find a super-fast boiler, use the 'Speed' filter on our kettle reviews.

What temperature does water boil at?

We were all taught in school that water boils at 100 degrees Celsius, and while this is true for the most part, it can actually depend on where you are in the country.

For example, if you live at sea level (or very close to it) your kettle will boil at almost exactly 100°C. However, if you were to boil it on top of Ben Nevis, for example, it would boil at 95.6°C.

This is less to do with elevation and more to do with atmospheric pressure. At more than 1,345 metres above sea level, Ben Nevis is the highest point in the UK. When you're at an altitude, the atmospheric pressure is lower, which means that water doesn't have to reach such a high temperature in order to boil.

So if you were ever to pop a thermometer in your kettle and find that it doesn't quite reach 100°C before switching off, not to worry; it's likely just related to where you live.

If you like the idea of boiling hot water at the touch of a button, see our guide to the best boiling water taps.

How to save money when using your kettle

To avoid wasting energy by following these quick tips.

• Boil only the amount of water you need Boiling a litre of water often uses more than twice the energy it takes to boil the minimum amount.
• Descale your kettle regularly If it’s full of limescale, it uses more energy to boil the same amount of water.
• Choose a kettle with a low minimum fill This means you won’t waste energy by boiling more water than you need.

Find out more about how much your appliances cost to run.