Most dishwasher buying guides are effectively rebranded spec sheets. They list everything - place settings, number of programs, the branded name of the washing technology - without telling you which of those numbers actually affects your life after the machine is installed.
The real decision comes down to seven specifications. Here's what each one means in practice, and what the sensible targets are.
1. Place settings, not litres
Dishwasher capacity is measured in place settings - a complete dinner setting of plate, side plate, cup, saucer, and cutlery for one person. It's a more useful measure than volume because it reflects how the machine is actually loaded in real life.
The useful thing about that definition is that it's countable. One person eating one meal generates one place setting. A household of four that runs the machine once a day is loading roughly four settings per meal, plus whatever cookware came with it - which is why cookware, not people, is usually what fills a dishwasher.
Against that, here's what the market offers. The 223 full-size dishwashers we list hold a median 15 place settings. That covers most households comfortably. The eight 450mm slimline models we list hold 9 to 11 - worth considering if bench space is tight, since you save 150mm of horizontal run.
Above about 14, pay attention to rack design rather than the headline number. A machine rated at 15 place settings with a rigid upper rack often takes less real-world loading than a 13 with good adjustable racks. The number assumes a laboratory arrangement of matching crockery; your kitchen has a stockpot.
2. WELS water rating
The WELS (Water Efficiency Labelling and Standards) scheme rates dishwashers for water efficiency on a star scale, separately from the energy label.
Here is what those stars are worth in litres, across the 209 machines we list that state a figure. The catalogue runs 5.7 to 13.8 litres per cycle, with a median of 11.2. By rating: models at 3 to 4 stars use a median 13.5 litres; at 4.5 to 5 stars, 11.7; at 5.5 to 6 stars, 11.0.
Read that carefully, because it's a smaller gap than the label implies. Moving from a 5-star machine to a 6-star one saves well under a litre a cycle - run daily, a couple of hundred litres a year. The bigger spread is between the thirstiest and most frugal machines on the whole list - 5.7 litres against 13.8 - not between adjacent star ratings. Compare the litre figure on the models you're choosing between, not their stars.
Water use and energy use do move together - more water means more water to heat - so a water-efficient dishwasher is usually an energy-efficient one too.
3. Energy star rating
Australian dishwashers carry a separate energy rating, and the useful number sits behind it: kilowatt-hours per cycle, which the label derives from an assumed 280 washes a year.
Across the 229 machines we list that state a per-cycle figure, that works out at a median $57 a year to run, at the ~30c/kWh Australian average. The full range is about $26 to $96. Check your own tariff - it's printed on your bill, and it's the number that decides what you actually pay.
By star band, the medians run: 2.5 to 3.4 stars, 219 kWh/year; 3.5 to 4.4 stars, 198; 4.5 stars and up, 158. So the gap between a mid-rated machine and a top-rated one is roughly $12 a year at the average rate. Real over a decade, and smaller than the label's presentation suggests.
The label assumes a cold-water inlet and the eco cycle under test conditions. Most dishwashers connect to cold and heat internally, which is what the label reflects. But consider: the eco cycle is the one most households don't use daily, so your real consumption will sit above the label figure.
4 stars or above is a sensible minimum. Below that you're paying more to run a machine you've already paid for - though as the numbers above show, not by much.
4. Noise level (dBA)
If your kitchen and living space are open-plan - which describes most modern Australian homes - dishwasher noise matters more than it used to. You'll run the machine after dinner while people are nearby, while watching something, or while a child is sleeping in an adjacent room.
The machines we list run 38 to 52dBA, with a median of 45. That's the whole spread - there is no 60dBA dishwasher on the market here, so the decision is between quiet and quieter rather than between quiet and loud.
Price tracks it, but loosely. Sorting the 116 models that state both a price and a noise figure, the cheapest third average 47dBA and the dearest third 43dBA - about four decibels for the whole price range of the category. Only 12 of the 244 models stating a figure reach 50dBA or above.
Four decibels is audible when you're standing next to the machine and marginal from the next room. If your kitchen opens onto where you sit in the evening, it's worth paying for; if the dishwasher is behind a door, it isn't. That's a judgement about your house, not about the machine, and no spec sheet can make it for you.
5. Half-load function
A half-load cycle uses less water and energy than a full one for roughly half the rack space. We don't hold per-cycle figures for half-load programs, so we can't tell you how much less - check the model's own documentation if it matters to you.
The logic is simple enough without a number. If you regularly run the machine half-full, a dedicated half-load program uses less than running a full cycle on half a load. If you wait until it's full, the function is irrelevant and shouldn't influence the purchase. Budget models often don't include it.
6. Adjustable upper rack
This is the feature that sounds minor but affects every load you run. An upper rack that adjusts height on the fly - no tools, one hand - lets you fit tall wine glasses on the top rack when needed, and load deep pots into the lower rack at the same time. A fixed upper rack forces a constant compromise: when it suits your glassware, it doesn't suit your cookware, and vice versa.
The adjustment mechanism matters as much as whether the feature exists. Some racks adjust via a lever or button on the side; others require lifting the whole rack and re-slotting it. Test it in store - a rack that technically adjusts but requires two hands and some effort will rarely get used.
A third rack - a shallow top tray for cutlery and small utensils - frees up the main rack considerably. It lets you lay spatulas, ladles, and small prep bowls flat, which cleans better than standing them in a cutlery basket. It's a convenience feature, but it's a genuinely useful one if you cook regularly.
7. Drying method
Heated drying uses a heating element in the base of the machine to evaporate remaining moisture after the wash. It works, but it runs hot enough to warp or fog plastic containers over time, and it uses meaningful energy for the drying phase alone.
Condensation drying uses residual heat from the final rinse to evaporate moisture, which then condenses on the cooler steel walls and drains away. No additional energy use. Results are good for crockery, glass and stainless steel; plastic items often come out damp, because plastic holds less heat and so doesn't drive the water off itself.
This is the dominant method here - 168 of the 253 dishwashers we list use condensation drying, active or passive - and for a household washing mostly crockery and glassware it's adequate.
Zeolite drying uses a mineral that absorbs moisture and releases heat as it does, drying the load without a heating element running. Only 4 of the models we list use it. The mechanism is genuinely different, but at four models it's a feature you'd be choosing a specific machine for, not a category to shop in.
What you can safely ignore
Number of wash programs. You will use two or three: a standard cycle, an eco cycle, and occasionally an intensive wash for heavily soiled loads. A machine with 12 programs doesn't wash better than one with four. Program count is not a quality signal.
Branded technology names. "EcoPerfect," "SteamZone," "ActiveWater" - marketing labels for what are usually standard functions (eco cycle, steam pre-wash, sensor-adjusted water use). Identify the underlying function you want and check the specification for it directly.
Interior lighting. Useful for loading in a dim under-bench cavity. Functionally irrelevant to cleaning performance.
Self-cleaning filters vs manual filters. A manual filter needs lifting out and rinsing periodically; a self-cleaning grinder filter doesn't, at the cost of more noise. Either is fine. It isn't a trade-off worth reordering a shortlist over.
Once you know which specs matter for your household, take our dishwasher quiz to find the models in our catalogue that match your requirements.
If the form isn't settled yet, our guide to which dishwasher your kitchen can take weighs freestanding, built-in, slimline and drawers against the gap you have. That guide is about what fits; this one is about what to buy.
Our dishwashers buying guide has the wider view.