Microwaves are a useful kitchen extra, whether you want to defrost some chicken, make a speedy baked potato or heat up yesterday's leftovers.
Do your research before you buy though. We’ve found price and power aren’t always reliable indicators of cooking or defrosting ability – some microwaves might frazzle the edges of your frozen chicken, leaving the middle solid. And some models might be too small to fit your crockery inside.
The best microwaves we've tested heat and defrost evenly, and are simple to use and easy to keep clean. Some even double up as a mini oven, grilling or baking food as well as microwaving it.
Watch our video to help you decide which type of microwave is right for you.
There are three types of microwave:
Sometimes called 'solo' microwaves, these basic microwaves are great for simple tasks such as warming up soup, heating ready meals or quickly defrosting food.
They tend to be cheap and compact so can be a good option if you just want to complete simple heating tasks more quickly than is possible in a conventional oven. But they don't brown food, so they're unable to compete with ovens on jobs such as grilling or roasting meat.
Grill microwaves can perform all the normal duties you'd expect from a standard microwave, such as defrosting ready meals and reheating leftovers, and the grill function can also brown food.
You can use the grill and microwave cooking functions separately or combine them, for example to brown the top of a shepherd’s pie while microwaving it. They usually come with a metal rack to bring food closer to the grill.
Combination microwaves tend to be the most expensive type of microwave – but they're also the most flexible. The grill and convection heating (fanned hot air) functions mean they can cook and brown your food, often much more quickly than a conventional oven.
For each type of microwave you can either buy a freestanding or built-in model.
Freestanding models sit on your countertop, whereas built-in microwaves slot seamlessly into your kitchen units, for example above your oven. Built-in microwaves are much more expensive than freestanding models.
Don't assume you need to pay the earth to get a decent microwave.
Budget microwaves costing less than £50, from the likes of Tesco and Asda, will be pretty basic. They tend to be on the small size, and are likely to be microwave-only (solo) microwaves with limited settings.
This makes them very easy to use, but you won’t usually get much in the way of auto cook or defrost programs (see features to look out for, below).
As you'd expect, typically the more you pay the greater the range of features and accessories.
Look for a microwave with a selection of auto programs (to automatically set the weight and time for specific foods), digital displays and easy-to-use push-button or touch panel controls.
Some models at this price will come with other extras such as delayed start and multi-stage cooking (to automatically switch between heating modes such as defrosting and heating).
Cheaper grill and combination microwaves are available for around £100.
Features to look for include self-cleaning catalytic linings and pull-down, oven-style doors, which make it easier to unload very hot dishes. Accessories you might find useful include 'crisper' plates and steamer accessories.
Models at the pricier end of the spectrum are likely to be built-in models.
If not, they should have stand-out features, such as one-touch sensor cooking, which works out what's needed for you – all you need to do is put your food in and press the start button – or a built-in steamer.
Despite their relatively straightforward purpose, microwaves can vary considerably in terms of the features and accessories they offer.
Here are some of the key features to look out for.
Flatbed microwaves do away with a traditional turntable. They use a different technology to distribute the microwaves and heat evenly.
The big advantage of a flatbed microwave is you get extra cooking space, as you can squeeze in bulky or oblong containers without having to leave room for them to rotate.
There are also fewer places for cooking grime to collect. On average, you will pay more for a flatbed microwave, though.
Microwaves come in all sizes, ranging from small, compact models to large, bulkier machines that’ll take up much more space on your counter.
Basic microwaves tend to be the smallest; some combis measure almost twice the size of the smallest solo (microwave-only) and grill microwaves we’ve tested.
Arguably more important than external size is internal capacity – we've found microwaves of the same size can vary massively in terms of usable space.
While manufacturers do generally state the internal capacity, this doesn't actually tell you what size dishes you'll be able to get inside. For every microwave we test, we measure the widest plate that you can fit through the door without tilting it.
Combis usually have a much bigger capacity than standard microwaves. The average combi can fit a 35cm-wide dish inside, compared with 29cm for a typical solo microwave.
All microwaves require some clearance space around them to allow air to ventilate, but the amount of space needed varies between models. So consider where yours will be placed and check this before you buy.
Half the microwaves we’ve tested need at least 30cm above them but we’ve also found plenty that only need between 10cm and 20cm.
Many also need 10cm to 20cm space at the back and sides. However, if you’re short on counter space it’s worth looking around a bit as we’ve found some that only need a 5cm gap around them, or don’t need any.
You can check clearance space for specific models by finding the user manual online or contacting the manufacturer directly.
Our tests have shown that power isn’t a good indicator of microwave performance. We've found 700W microwaves that can cook food as well and quickly as 1,000W microwaves.
For the past 15 years, microwaves have been labelled according to their heating category – A is the least powerful, E the most. This gives consumers a rough guide to how powerful their microwave is and how long to heat food for.
We test the performance of microwaves against their power ratings, and have found they’re not always accurate – differences of 5% to 10% are commonplace. Use our to check how accurate energy labels are, and always make sure your food is hot enough to eat before tucking in.
Every year we survey thousands of Which? members who own a microwave to find out what they think of the brands they’ve bought and which brands have encountered the most problems.
We’ve looked at the big brands including Panasonic and Samsung, as well as cheaper brands such as Daewoo, Tesco and Argos, to see which brands are the most reliable and the most popular.