How to save energy – is it worth buying a dishwasher?

How to save energy at home: dishwasher

By investing in a dishwasher, you will gain a lot – you will save money and time.

You will be able to save a lot of water as well as the energy needed to heat it. Using a dishwasher will wash three times more dishes with the same amount of water than if you did it by hand. And you’ll use half the energy!

The dishwasher also saves you time because you can wash less often, but use 100% of the dishwasher capacity. When buying a dishwasher, it’s also worth paying attention to whether it has a short, economical program.

Dishwasher capabilities are invaluable, it will wash 140 dishes using 15 litres of water and 1.05 kWh of electricity. If you wash the same amount of dishes by hand, water consumption will be 40 litres and electricity 5.0 kWh.

When using a dishwasher, it should be fully charged to maximise the use of energy. Do not rinse the dishes before putting them in the dishwasher, just remove the larger food residue. This is a way to avoid the additional costs associated with water and energy consumption.

If the dishes are normally dirty, use the 50 degrees C programme. Compared to a 60 degree program, you will save up to 30% energy. If the dish is very dirty or needs to be washed quickly, it is worth to use the short or economical program. However, from time to time (at regular intervals) you should use the 60 degrees program, this will help to self-clean the dishwasher and prevent unpleasant odours.

It is also worth (for economic reasons) considering buying a large dishwasher. A large dishwasher (60 cm wide) uses less energy than a small one. That’s why it’s better to buy a large dishwasher, which we’ll use less often.

When buying a dishwasher, pay particular attention to the energy label.

You will find there:

Energy efficiency class (modern dishwashers have triple A (AAA) on the label;
Cleaning efficiency;
Drying efficiency;
Water consumption;
Noise level during washing. (quiet appliances have values of about 50dB, very quiet work “whisper” at values below 45dB).

Power and water consumption of old and new dishwashers

Power consumption

Old dishwasher

1 person
240 kWh
2 persons
350 kWh
4 persons
610 kWh

New dishwasher (class AAA)

1 person
80 kWh
2 persons
105 kWh
4 persons
190 kWh

Possible energy savings

1 person
160 kWh
2 persons
245 kWh
4 persons
420 kWh

Water consumption

Old dishwasher

1 person
4 m3
2 persons
6 m3
4 persons
11 m3

New dishwasher (class AAA)

1 person
2 m3
2 persons
3 m3
4 persons
5 m3

Possible water saving

1 person
2 m3
2 persons
3 m3
4 persons
6 m3

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