The overall Which? test score is made up of the following star ratings, all determined by our rigorous lab tests.
How we test single use
We test how quickly and evenly microwaves heat in microwave mode and we record how much water is lost from the food during cooking. This is the overall score for microwaves heating one dish, from cold, in microwave mode.
How we test speed of heating
We test how quickly the microwaves can heat up when cooking in microwave mode.
How we test evenness of heating
We check for hot and cold spots in food to make sure it's evenly cooked.
How we test quality of food
We test how much water is lost from food when heating in microwave mode.
How we test continuous use
This is the overall score for microwave heating when the microwave has previously been in use and has warmed up. We test how quickly and evenly microwaves heat in microwave mode and we record how much water is lost from the food during cooking.
How we test manual defrost
How evenly the microwaves defrost minced meat on a manual setting.
How we test auto defrost
How well the microwave defrosts using its automatic defrost program.
How we test steaming
How well the microwave steams a meal of fish, potatoes and veg.
How we test grilling toast
How widely and evenly the grill browns slices of white, crustless bread.
How we test ease of use
This includes setting the clock, opening and closing the door, loading and unloading the oven, using the power and time controls, reading the display, cleaning, and the instructions and information provided by the manufacturer.
How we test cleaning
How easy it is to clean inside the microwave and the exterior casing.
How we test quietness
We test how noisy each microwave is in microwave heating and defrosting mode.
How we test energy consumption single use
How much energy is used by the microwave to heat food when it is only used once.
How we test energy consumption repeated use
How much energy is used by the microwave to heat food when it is being used in quick succession.
