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Having entered the homes of thousands of people around the world during the 1970s, the dishwasher is now one of the world's most widely used home appliances. Dishwashers work by spraying utensils, cutlery and crockery with hot water (typically reaching somewhere between 55 and 75 degrees Celsius). The majority of dishwashers feature a variety of settings, allowing the user to adjust the water temperature for more delicate items. The water is mixed with a household detergent and circulated around the machine via a pump, which sends the water to a series of rotating spray arms to blast the items with the mixture of hot water and detergent, thus cleaning the dishes. Once the wash has been complete, the water/detergent mix is drained, and more hot water is pumped in, in order to rinse the dishes. Some dishwashers feature a heating element which dries the dishes via hot air. Types of dishwasher There are a number of different dishwasher designs available to suit the spatial and personal requirements of the user. Some dishwashers, known as integrated dishwashers, are specifically designed to be built-in or retrofitted into a kitchen, taking the place of a cupboard and matching the kitchen surrounds in order to remain aesthetically neutral. Slimline dishwashers are ideal space-saving devices for those with little room to spare in the kitchen, and are particularly useful in smaller studio apartments. Table-top dishwashers feature an opening at the top surface of the unit, whereby the dishes are loaded from the top of the device. These can also be used to space-saving effect.