By law manufacturers must disclose the energy efficiency of their appliances, rated A to G. These are usually displayed prominently in showrooms. The better the rating, the more energy efficient the appliance is - good for both the environment and your pocket.

Consider which accessories might be beneficial. Many models can be supplied with a draining basket, chopping board and strainer bowls. A drainer extension can be useful for sinks without a drainer where worktop space is limited in a small kitchen.

A concealed heating element reduces the risk of lightweight plastic items such as children's drinking cups melting onto it after becoming dislodged mid-cycle. Limescale build-up is also prevented. Some manufacturers now produce models with the concealed heating element coiled around the water inlet pipe for further energy efficiency.