A slimline dishwasher is 45cm wide instead of 60cm. That's the whole difference on paper, and it sounds minor.
In practice it changes how the machine fits into your week, and there's one thing about slimline dishwashers that almost nobody mentions until after you've bought one.
The thing nobody tells you: they aren't cheaper
Most people assume a smaller appliance costs less. Look at what we actually stock:
- Montpellier MDWBI4553 45cm integrated — 10 place settings — £369
- Montpellier MDWBI6053 60cm integrated — 12 place settings — £369
Same brand, same finish, same price. The narrow one gives you two fewer place settings for exactly the same money.
It gets starker. The Candy CI3E53E0W-80 full-size integrated is £319 for 13 place settings — £50 less than the 45cm Montpellier, for 30% more capacity.
This isn't a pricing quirk on our side. Slimline models sell in lower volumes, so they rarely carry the discounts full-size machines do. Buying slimline is a space decision, not a money decision. If someone tells you a slimline will save you cash, they haven't checked.
What a "place setting" actually is
The capacity figure is measured to a standard, and the standard is more generous than your kitchen.
One place setting is a dinner plate, a side plate, a bowl, a cup and saucer, a glass, and cutlery for one person. It assumes ordinary domestic crockery and no large items.
What it does not account for: mixing bowls, roasting tins, baking trays, casserole dishes, chopping boards, a large pan. Those are the things that fill a dishwasher in real life, and they eat disproportionately into a 45cm basket.
A rough working rule: knock two to three place settings off the quoted figure to get what you'll actually load on a normal day.
The numbers, honestly
| Width | Typical capacity | Realistic daily load |
| 45cm slimline | 9–10 place settings | 1–2 people, or 3 at a push |
| 60cm full size | 12–14 place settings | 4–5 people comfortably |
The consequence of getting this wrong is running the machine twice a day instead of once. Two half-full cycles use considerably more water and electricity than one full cycle, so an undersized dishwasher is more expensive to run as well as more annoying to live with.
When a slimline is genuinely the right buy
You physically don't have 60cm. This is the honest reason, and it's a good one. Galley kitchens, flats, and older properties where the run is already tight. 15cm of worktop is 15cm.
The alternative is losing a cupboard, and a cupboard you use every day may be worth more to you than three extra place settings.
There are one or two of you. A couple who cook most nights will fill a 45cm machine in about a day. That's exactly right — a dishwasher should run daily when full.
It's a second dishwasher. Uncommon in UK homes but it happens in larger kitchens and utility rooms.
It's a rental or a holiday let. Lower occupancy, smaller loads, and the space usually matters more than the capacity.
When people regret it
Families of four or more. This is the main one. A 45cm machine with four people in the house means running it every evening and hand-washing the overflow — which rather defeats the purpose.
You entertain. Six people for dinner produces well over ten place settings once serving dishes and glasses are counted.
You batch cook. Roasting tins and big pans are the exact items a slimline basket handles worst.
You chose it purely on price. See above — there's no saving to be had.
Integrated or freestanding at 45cm
Both exist and the choice works the same as at 60cm, with one caveat: slimline freestanding machines are noticeably cheaper than slimline integrated ones, because there's no furniture door to hang.
The White Knight AT45FSDW at £238.99 and the SIA 45cm freestanding at £290 are the accessible end.
If it has to disappear behind a cabinet door, the Montpellier MDWBI4553 at £369 is the sensible option, and the Smeg 45cm Slimline Fully Integrated at £550 is the step up on build and quietness.
Remember the furniture door is supplied by your kitchen, not by us — our integrated appliances guide covers hinge types and housing sizes properly.
Before you commit to 45cm, measure again
People buy slimline because they think they don't have room, and a surprising number of them do.
Measure the gap at the narrowest point, floor to worktop, including any skirting or pipework at the back. A 60cm dishwasher needs roughly 600mm of width and about 570mm of depth. If you have 600mm, buy the full-size machine — it's cheaper and it holds more.
Our measuring guide has the full checklist, including delivery access, which catches people out more often than the aperture does.
Our picks
If you need slimline and want to spend the least: White Knight AT45FSDW, £238.99.
Best slimline integrated: Montpellier MDWBI4553, £369.
Best slimline overall: Smeg 45cm Slimline Fully Integrated, £550.
If you actually have 60cm: the Candy CI3E53E0W-80 at £319 is more machine for less money, or the Montpellier MDWBI6064 at £429 for 14 place settings.
Frequently asked questions
Is a slimline dishwasher cheaper to run?
Per cycle, slightly — less water and a smaller load to heat. But if the smaller capacity makes you run it twice as often, you end up using more. Cost per item washed is what matters, and on that measure full-size usually wins.
Can I fit a 45cm dishwasher in a 60cm gap?
Physically yes, but you'll have a 15cm gap to fill with a panel or a filler strip, and it looks like what it is. If you have 60cm, use it.
How many people can a 45cm dishwasher realistically serve?
One to three, running it daily. Four or more and you'll be running two cycles or hand-washing the difference.
Do slimline dishwashers have the same programmes?
Generally yes. Eco, intensive, quick wash and half load appear across both sizes. You're losing capacity, not features.
Are slimline dishwashers noisier?
Not inherently, but the cheapest models in any size tend to be the loudest, and the slimline range skews cheaper. If noise matters — an open-plan kitchen, for instance — check the decibel figure rather than assuming. Our guide to appliance noise ratings explains what the numbers mean.
Is a 45cm dishwasher better than no dishwasher?
Yes, comfortably. A slimline that runs daily beats hand-washing on both water use and time. The question is only whether you could have fitted a bigger one.
Still unsure? Send us your measurements and how many you cook for and we'll tell you straight which size you need.
