The water consumption of the dishwasher

An energy-saving label was introduced for dishwashers at the end of 1990. However, at that time the focus was only on electricity consumption. The water consumption remained in the dark for a long time. Since 2011, the new energy-saving label has contained significantly more information, including, of course, water consumption.

Information on water consumption has only recently become mandatory

Indeed, it is surprising why no information on real water consumption has been given for dishwashers for so long. After all, the impact is as high as the water consumption of a washing machine. Even if we do not know why the water consumption had not been taken into account so far, at least reasons were given as to why labeling has also been mandatory since 2011.

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The data on the energy-saving label for dishwashers

Today, the energy-saving label must contain the following data (since 2011):

  • Energy demand (electricity) as an energy efficiency class
  • Energy requirement per year in kWh with an average of 280 wash cycles
  • Water consumption per year in liters with an average of 280 wash cycles
  • Drying efficiency classes
  • Washing capacity (number of place settings)
  • Volume of the dishwasher in dB (A) sound power

Almost halved water consumption in just 10 years

The energy consumption of household electrical equipment has been optimized in the last few years (example inverter technology) that the power requirement of all commercially available dishwashers today is below 1 kWh per rinse. This finally has the water consumption in the focus. This is quite worth noting, considering that water consumption has fallen by about 40 percent in the last 10 years.

Hand rins today under optimal conditions no longer cheaper

This means that modern dishwashers used 10 years ago after all around 25 liters of water per cleaning point. Today's values are between 6.5 l and 15 l. Thus, at least the continuous burner question is answered, whether dishwasher dishwashing or rinsing is more economical. The latest generations of dishwashers are equipped with inverter technology, which couples the energy requirement to the actual requirement.

Remember: the consumption values are voluntary information

The situation is similar with the water consumption of dishwashers. Modern devices measure the load and adjust the water requirement accordingly. However, you cannot rely solely on the water consumption according to the energy-saving label. The information is provided voluntarily by the dishwasher manufacturers.

Manufacturers may specify the best values regardless of the program

This goes hand in hand with the right to specify the most efficient values for individual wash programs. This means that not all of these specified consumption and efficiency values have to be adhered to in one and the same wash program. However, numerous dishwashers have been tested for consumption by Stiftung Warentest.

These programs are the most efficient way to wash

The water consumption and energy efficiency are within the values that we have already stated here. However, the results regarding the program selection options are interesting. Short programs require up to a third more energy and water, while energy-saving and energy programs actually help save a lot here. But washing the dishes takes significantly less time.

Tips & Tricks You can also save water. The dishes are usually collected in the dishwasher for days before they are switched on. This means that leftovers dry out. This in turn means that individual parts have to be washed several times to get them sparkling clean. Since the water consumption is about as high as a hand wash today, clearly rinsing the dirty dishes before putting them in the dishwasher is not a real option.

They only increase the water consumption permanently. Instead, you should switch off the dishwasher for half an hour or a full hour after the dishes have been "washed up" for the first time (i.e. after a few minutes). You can soak dried-on food residues so that they can be easily removed for the dishwasher when you switch it on again without increasing water consumption or the energy required.

When it comes to water consumption and energy requirements of washing machines, there is no longer any difference to hand washing. However, machine washing has a higher environmental impact, especially where the water is extremely hard. Information about this can be found under the salt for the dishwasher.