In Eco mode a dishwasher uses 0.5-0.9 kWh and 6-12 litres per cycle, less than hand washing. The real numbers, annual cost and how to keep it low.
On the Eco program, a modern dishwasher consumes on average 0.45-0.9 kWh and 6-12 liters of water per cycle. In practice, a full wash costs around 12-18 cents in energy alone. The fact that surprises almost everyone is another one: with those 6-12 liters the dishwasher washes an entire load, while washing the same dishes by hand under running water often requires 40 to 80.
As with the washing machine, the heavy part of consumption is the water heating. That's why the program and the fill level matter more than the energy class on the label. Let's look at the real numbers, what makes them go up and how to keep them low without giving up clean plates.
In brief: what you'll find in this guide
The short answer
An Eco cycle on an efficient dishwasher consumes approximately 0.5-0.8 kWh and less than 10 liters of water. With a reference price of €0.25 per kWh, that's about 15 cents of energy per wash. Intensive programs and high-temperature quick cycles consume more. The practical rule: fill it up and use Eco, and it becomes one of the most economical appliances in the kitchen.
How much each program consumes
How is consumption measured today? The European energy label, updated in 2021, shows the value in kWh per 100 cycles of the Eco program, along with water per cycle and the number of place settings (the table places the machine can wash in one load). For single wash consumption just divide by one hundred. However, not all programs consume the same way.
| Program | Characteristics | Indicative consumption per cycle |
|---|---|---|
| Eco (label reference) | low temperature, long duration (2-4 hours) | 0.5-0.9 kWh, 6-12 liters |
| Auto / Normal | adapts temperature and duration to soil level | 0.9-1.4 kWh, 10-15 liters |
| Intensive | high temperature, for pots and stubborn soiling | 1.4-2.5 kWh, 14-18 liters |
| Quick | fast but hot, for lightly soiled dishes | 0.8-1.3 kWh, 10-14 liters |
The quick program paradox repeats here too: it runs short, but to clean quickly it raises the temperature, so it's almost never the most economical. The true savings program is Eco, which extends the time precisely to lower the heat.
Water: the true advantage of the dishwasher
Here's the most editorially useful data point to know. A modern dishwasher in Eco mode uses between 6 and 12 liters for a full load. Washing the same number of dishes by hand under running water easily reaches 40-80 liters, because the tap runs for a long time. The dishwasher, in short, doesn't waste water: it recirculates it through spray jets, heating only a small amount.
This also changes how you think about consumption: the cost of water per cycle is almost negligible, while energy to heat it matters. The advantage is greatest when the machine is full. Capacity in place settings, therefore, should be chosen based on the number of people and habits: we discuss this in the guide on dishwashers 45 or 60 cm and, more generally, in how to choose a dishwasher.
How much a cycle costs (and how much in a year)
At €0.25 per kWh, the cost of energy alone for an Eco cycle is around 15 cents. On an annual basis it depends on how often you use it.
| Frequency of use | Cycles per year | Estimated energy cost |
|---|---|---|
| Couple, moderate use | around 180 (Eco) | around €30-35 |
| Family, daily use | around 300 (Eco) | around €45-55 |
| Intensive use, hot programs | around 350 (mixed) | over €100 |
The range is wide precisely because the program chosen matters more than anything else. Those who almost always use Eco at full load stay in the lower range; those who alternate between intensive and hot quick cycles approach the upper range.
Why the Eco program is almost always worth it
The Eco cycle works below 50 degrees and compensates with more time. It reduces energy compared to hot programs while maintaining excellent results on normal dirt, which is the case for most household loads. The long duration may seem off-putting, but you don't need to stand by the machine: just start it in the evening. It's also the program on which the energy rating is calculated, so it's the one that makes the dishwasher as efficient as the label promises.
The exceptions are pots with dried-on stains or very greasy dirt: there intensive makes sense. For everything else, Eco is the default choice.
What increases consumption
Using hot programs out of habit. Intensive and quick cycles at high temperature easily double the consumption compared to Eco.
Running it half empty. Half load doesn't halve consumption: it's worth waiting to fill it up.
Pre-rinsing by hand under running water. It defeats the machine's water savings. Just remove solid residue, don't rinse everything.
Neglected salt and rinse aid. Without proper water softening, the machine performs worse and sometimes extends cycles. It also affects results and, over time, your glasses: we discuss this in why the dishwasher leaves glasses cloudy.
Dirty filter. A clogged filter reduces washing efficiency and forces you to repeat cycles.
How to reduce expenses
Eco as standard program, reserving intensive only for difficult pots and pans.
Always at full load: it's the rule that makes every dish more economical.
No hand rinsing: just remove the large residues and load.
Off-peak tariff: if you have it, start the dishwasher in the evening or at the weekend with delayed start.
Regular maintenance: clean filter, salt and rinse aid at the right level, water hardness check.
The Portos choice
The dishwasher has an undeserved bad reputation for consumption. Used as it should be, that is full and on Eco, it's more economical and uses less water than hand washing. The difference between a modest bill and an inflated one doesn't come down to the model, but to the habit of always pressing the same button. Before thinking about a new appliance to save money, try using only Eco at full load for a month: in most cases that's all you need.
Frequently asked questions
Find answers to the most common questions about consumption, the Eco program and comparison with hand washing in the dedicated section at the bottom of the page.
The calculation on two real models: 0.849 kWh per cycle versus 0.543 amounts to €25.16 difference per year at five cycles a week, and €173.88 higher price that pays back in 6.9 years. The complete calculation, with three usage scenarios, is in the comparison between Bosch SMV4HVX03E and SMH6YCX02E.
Sources
European Commission, energy label for dishwashers in force from 1 March 2021 (consumption in kWh per 100 cycles, water per cycle, place settings, on the Eco program).
ENEA, Department for Energy Efficiency Unit, section on energy label for appliances.
ARERA, reference values for electricity prices for the domestic market, 2026.
