What a dishwasher running cost actually looks like right now
Your supplier is quietly hoping you never do this sum. From 1 October the price cap electricity rate is 26.32p per kWh for a direct debit customer, and a typical dishwasher running cost draws somewhere between 0.7 and 1.5 kWh a cycle depending on the programme.
Do the maths and the dishwasher running cost lands at roughly 20p to 40p a cycle. Run it once a day and that is somewhere around £6 to £12 a month, before water, detergent and salt.
That is not a shock bill. It is a fairly small, fairly steady cost. The real question is not whether to own one, but how to stop it creeping toward the top end of that range without you noticing.
One thing worth knowing while you do this sum: that 26.32p carries no VAT. The government suspended VAT on domestic electricity in Great Britain from 1 October 2026 to 31 March 2027. From 1 April 2027 the 5% rate returns, so the same cycle will cost a little more from spring without your machine or your habits changing at all. Northern Ireland stays at 5% throughout.
Is it cheaper to run a dishwasher than washing up by hand?
For a full load, yes. A modern dishwasher on a normal or eco cycle generally uses less hot water and less energy than washing the same amount of crockery by hand under a running tap.
The catch is the word “full”. Run a dishwasher that’s only ever half full and you can easily spend more than you would scraping plates at the sink. The saving only shows up once the machine is doing a proper job’s worth of washing, so a household of one or two should watch this more closely than a family of five filling the machine most days anyway.
So the honest answer is a bit less exciting than the headline: dishwashers usually win on cost, but only for people who wait until the machine is actually full before pressing start.
Does eco mode really cut the running cost?
Yes, and by more than most people expect. Eco mode washes at a lower temperature for longer, which sounds like it should cost more but actually uses less electricity overall, because heating water is the single biggest cost in any cycle.
A standard cycle might use close to 1.5 kWh, roughly 39p at the current rate. The same load on eco mode can often use nearer 0.7 to 1 kWh, about 18p to 26p, roughly halving the electricity share of the cycle for a wash that takes longer but needs no extra attention from you.
The trade off is time, not effort. An eco cycle can run for three hours or more. If you are not in a rush for clean plates, that is a fair swap.
Three checks that decide your dishwasher running cost
Three habits separate a cheap dishwasher from an expensive one, and none of them involve buying a new machine or switching supplier.
Key takeaways
- Wait for a genuinely full load. A half full dishwasher run daily is the single biggest driver of a high dishwasher running cost.
- Default to eco mode unless plates are visibly greasy. It is slower, not weaker, and roughly halves the electricity used per cycle.
- Skip the heated dry setting and let the door pop open instead. Heated dry adds to the cycle for very little benefit.
- Descale roughly every one to three months in hard water areas. A machine full of limescale works harder, longer, and costs more to run.
- Check the rating label on your model. A newer A rated dishwasher can use noticeably less energy per cycle than an older one doing the same job.
Running it for less: timing and off peak rates
If you are on an Economy 7 or similar off-peak tariff, shifting the dishwasher to run overnight can trim the electricity side further, since of peak rates sit well below the standard unit price.
Most dishwashers have a delay start button for exactly this. Load it after dinner, set it for the off peak window, and let it finish while you are asleep rather than running on full price daytime electricity.
This will not suit everyone, and it is not a saving that changes anyone’s life on its own. But stacked with eco mode and full loads, it is another small lever on the same dial, and one that costs nothing to try tonight.
On a flat rate tariff, moving the wash later saves nothing. It just shifts the noise and the warm exhaust air to a time when everyone is winding down rather than mid dinner.
How the dishwasher compares to your other appliances
A dishwasher sits in the middle of the pack. It costs less per use than a tumble dryer and is broadly comparable to a washing machine on a warm wash, because in both cases almost all the energy goes on heating water rather than on turning the drum.
If you want the full picture rather than one appliance at a time, our appliance running costs guide ranks the worst offenders in a typical UK home, our washing machine running cost guide covers the appliance most often run alongside it, and our tumble dryer guide covers the one that actually costs real money.
None of these numbers are exact for your kitchen. Your machine’s age, your water hardness and your usual cycle all move the figure, and an older machine with a failing seal or a struggling heating element can quietly cost more than its age alone would suggest. Treat every price here as a rough guide.
Frequently asked questions about dishwasher running costs
- How much does it cost to run a dishwasher once a day?
- Roughly 20p to 40p a cycle at the current price cap rate of 26.32p per kWh, which works out at around £6 to £12 a month depending on the programme and how full the machine is.
- Will my running costs change in April?
- Slightly. VAT on domestic electricity in Great Britain is zero from 1 October 2026 to 31 March 2027, then returns to 5%, so the same cycle costs a little more from 1 April 2027 even if nothing else changes.
- Is eco mode always the cheapest setting?
- Almost always, yes. It uses less energy per cycle than a standard or intensive wash, though it takes longer to finish.
- Does a dishwasher use a lot of water compared to hand washing?
- A cycle run with a full load typically uses less water than washing the same amount by hand under a running tap, which is part of why the overall cost tends to come out lower.
- Should I rinse plates before loading the dishwasher?
- A quick scrape of food scraps is enough. Pre rinsing under a hot tap adds water and energy use without meaningfully improving the wash.
- Does an old dishwasher cost more to run than a new one?
- Usually. Older machines tend to lack modern eco programmes and can use noticeably more energy per cycle than a newer A rated model doing the same job.
None of this requires a new machine or a new supplier, just a slightly different button pressed most nights. If your bills feel high for other reasons too, it is worth checking whether you are still on the best deal available rather than a default tariff quietly renewing itself.
Sources
- Ofgem, Energy price cap unit rates and standing charges. The 26.32p per kWh electricity unit rate for direct debit customers from 1 October 2026, and the note that it carries no VAT during the suspension.
- GOV.UK, Temporary zero rate of VAT in Great Britain for domestic electricity. The 1 October 2026 to 31 March 2027 window, and that Northern Ireland remains at 5%.
Checked 28 September 2026. Appliance energy use varies by model, so the per cycle figures are an estimate based on typical consumption.
