Recalculated What are the benefits of eco mode on dishwashers & co.

How can eco mode be more energy efficient with significantly longer running times? We explain the physics and how much electricity you can actually save.

At first glance, eco mode seems absurd. Three to four hours of washing time hardly seems compatible with the promise of lower energy costs. However, the energy consumption of a household appliance is not measured by the running time alone, but by the physical processes inside.

Attention fire hazardThese devices should never be connected to an extension cable

The decisive factor is the temperature. Heating the water is the biggest energy factor. Whether laundry is washed at 90 or 30 degrees makes a massive difference to electricity consumption. High spin speeds also drive up consumption, as do oversized appliances or poorly utilized drums.

Added to this is technical progress. Modern appliances with a high energy efficiency class consume significantly less electricity than older models. Nevertheless, temperature remains the dominant lever. And this is precisely where eco programs come in.

How eco mode actually works

Contrary to popular belief, eco programs do not simply wash more slowly, but in a strategically different way. They heat less water, more slowly and often not up to the maximum temperature indicated on the display. Instead, the cleaning performance is achieved over time. Longer soaking phases replace high heat.

This explains why longer operation does not automatically consume more electricity. The heating element runs less frequently and for shorter periods, and this is where the greatest savings are made.

Caution, electricity trapThese 3 devices need continuous current

Practical tests confirm this effect. A standard dishwasher consumes around 1.05 kilowatt hours of electricity in a one-hour standard program at 65 degrees. In the Eco program, consumption drops to 0.73 kilowatt hours, despite a significantly longer running time.

The difference is even clearer for washing machines. A cotton program at 40 degrees and 1,400 revolutions requires around 1.11 kilowatt hours. In eco mode, it is only 0.54 kilowatt hours - less than half.

Televisions in economy mode - a different compromise

Not every eco mode works on the same principle. In televisions, for example, electricity is saved primarily by reducing screen brightness, lowering contrast and deactivating image optimization. Functions such as HDR, which ensure intense colors and high dynamics, are turned down.

The effect is visible. The picture quality suffers significantly in bright rooms, but less so in darker surroundings. Energy efficiency comes at the price of a noticeable loss of comfort. This is in contrast to washing and rinsing programs, where the result usually remains the same.

What actually pays off financially

With an electricity price of around 28 centimes per kilowatt hour, a standard wash cycle costs around 30 centimes. In the Eco program, the costs are reduced by around half. With lower water consumption at the same time. The picture is similar for washing machines. A standard wash cycle costs around 19 centimes, the eco wash cycle around 10 centimes.

The amounts seem small, but add up over the year. In multi-person households or with frequent use, there is a measurable difference on the electricity bill.

However, as efficient as the physics of eco mode is, it is also important to consider the longevity of the appliance. Service technicians repeatedly warn that the massively longer running times put more strain on mechanical components such as bearings, seals and pumps. Anyone who washes exclusively in eco mode also risks the formation of biofilms (germ deposits), as the low temperatures do not completely dissolve grease and bacteria.