Buying guide
How to Choose an Energy-Efficient Dishwasher
A data-driven guide to picking a dishwasher that sips power and water, using real ENERGY STAR running costs and the specs that actually move your bill.
The short answer
Buy a full-size ENERGY STAR dishwasher with a soil sensor, size it to your household so you can run full loads, and plan to skip the heated-dry cycle. Across the 709 ENERGY STAR dishwashers in our database, annual running cost ranges from about $15 to $45, with a median of $44 at the US average electricity rate of $0.1856 per kWh (EIA). That tight spread is the real headline: once a machine earns the ENERGY STAR label, how you run it matters as much as which one you pick.
Everything below is grounded in the public dishwasher efficiency data, and you can plug any model's kWh into the running-cost calculator to see your own number at your local rate.
Why the running-cost range is so narrow
People expect a huge gap between an efficient dishwasher and a wasteful one. In practice, modern qualified machines are bunched together. The most efficient full-size units in our data draw around 202 kWh a year (roughly $37), while the least efficient ENERGY STAR full-size models draw about 240 kWh (roughly $45). That is a difference of about $7 a year, or a little over $70 across a ten-year life.
For context, the federal reference point for a standard-size dishwasher is 307 kWh per year, which would cost about $57. So the meaningful savings come from moving off an old or non-qualified machine to any ENERGY STAR model, not from agonizing over which qualified model is a few kWh better. If your current dishwasher is a decade old or you still hand-wash, that is where the real money is. See our full cost to run a dishwasher breakdown for the year-over-year math.
Place settings: match capacity to how you actually cook
Capacity is measured in place settings, and the catalog runs from tiny 2-setting countertop units up to 18-setting giants. The median is 14, and the most common sizes are 12, 15, and 16 settings. This is the spec most buyers get wrong, in both directions.
Oversize the machine and you will run it half-empty, which wastes water and energy per dish. Undersize it and you run two cycles where one would do, which is worse. A standard 24-inch, 14-to-16-setting model fits most families of three or four. Couples and small kitchens can look at compact 8-to-12-setting units, and the smallest countertop models (like the 2-setting Loch L1126 at just 80 kWh a year) suit apartments where a full built-in will not fit. Do not treat a small machine as automatically greener: its per-dish efficiency is often worse, it just uses less total energy because it holds less.
Soil sensors and heated dry: the specs that earn their keep
Two features do most of the real-world work.
Soil sensors read how dirty the water is and shorten the cycle or cut a rinse when the load is lighter. On a machine you run five or six times a week with mixed loads, a good sensor trims water and heating on the majority of cycles that are not actually filthy. It is worth prioritizing, and nearly every mid-range and up model now includes one.
Heated dry is the single biggest habit-level lever you control. A heated-dry element can add a meaningful chunk of energy to each cycle, and it is entirely optional. Choosing air dry, or opening the door at the end to let dishes finish on their own, sidesteps it. Machines that use a condensation or fan-assisted dry, or that come with a rinse-aid-driven drying system, get you dry dishes without the resistive heat. If two models are otherwise close, pick the one whose default cycle does not force heated dry.
Water heating deserves a mention too, because the electricity number on the label does not capture the hot water your dishwasher pulls from your tank. A dishwasher with an internal booster heater and a good sensor uses less hot water overall, which quietly lowers the part of the cost that does not show up in the kWh figure.
What the real numbers look like
Here is how full-size ENERGY STAR dishwashers actually stack up at $0.1856 per kWh, using real models from the data:
| Tier | Example model | Place settings | kWh/yr | Est. annual cost |
|---|---|---|---|---|
| Most efficient full-size | Fisher & Paykel DD24DTX6I1 | 14 | 202 | ~$37 |
| Very efficient | Asko DBI563 | 14 | 205 | ~$38 |
| Median qualified | Midea MDT24P3C | 16 | 229 | ~$43 |
| Least efficient ENERGY STAR | Amana ADFS2524R | 12 | 240 | ~$45 |
Notice that a larger 16-setting machine can beat a smaller 12-setting one on annual cost. Capacity and efficiency are not the same axis, which is exactly why you should size for your loads first, then compare kWh among the models that fit.
A quick buying checklist
- Confirm the ENERGY STAR label. It is the difference that matters, worth roughly $13 a year versus a non-qualified standard machine.
- Size to your household. 14 to 16 settings for a family, 8 to 12 for a couple, countertop only if a built-in will not fit.
- Insist on a soil sensor. It saves water and energy on the light loads that make up most cycles.
- Check the drying method. Favor air, condensation, or fan-assisted dry over a resistive heated-dry default.
- Look up the exact kWh. Two similar-looking models can differ by 30 to 40 kWh a year. Run the number through the calculator at your own rate before you decide.
The honest takeaway: no ENERGY STAR dishwasher on the market is going to blow up your electric bill, and none will slash it either. Pick the right size, get a soil sensor, skip heated dry, and run full loads. Do that and you will land near the efficient end of the range no matter which qualified model ends up in your kitchen.