In the majority of modern kitchens there will probably be a dishwasher either a free-standing type or more commonly an integrated model but if you are concerned about the economy of using a dishwasher compared to good old-fashioned washing up how do the two methods of doing the dishes compare?
The answer to this question very much depends on the size of the family that are using this appliance. For people living alone with only a small amount of dish washing to do then probably if they own a dishwasher it would not need to be run more than twice a week. This would mean that dirty plates and bowls would be sitting unwashed for few days which is not ideal. A larger family would usually fill the dishwasher in a day so this would not be an issue.
Heating hot water to wash up by hand uses energy and may be wasteful whereas a dishwasher run on economy mode will only heat the amount of water that it needs. Modern dishwashers have an energy rating ranging from A+++ to D so when buying a new appliance, it is important to choose one with the highest energy rating possible meaning that it is the most efficient in terms of energy use and water consumption.