Standard 24-inch dishwashers with ENERGY STAR certification use 3–5 gallons of water and 1.2–1.8 kWh per cycle, saving $35–$50 annually over older models.
The energy efficiency of 24-inch dishwashers comes down to three numbers: how many gallons of water each cycle draws, how many kilowatt-hours it consumes, and what your local electricity rate is. Modern units use far less of both than older machines did, and a few simple habits squeeze even more out of every load. At the average U.S. electricity rate of roughly $0.15 per kWh, each load on an efficient model costs between $0.18 and $0.27 in electricity alone.
How Much Energy Does a 24-Inch Dishwasher Actually Use?
Power draw for a standard 24-inch residential dishwasher ranges from 1,200 to 2,400 watts per cycle, with most modern units averaging around 1,800 watts. That works out to 1.2 to 1.8 kilowatt-hours for a one-hour cycle, according to energy data from Sustainability SE. The electricity cost per load depends on your local rate, but the water side of the equation has shifted more dramatically. Older dishwashers could use up to 27 gallons per cycle.
Noise has also improved alongside efficiency. High-efficiency models from brands like Bosch maintain a quiet 44 dBA rating while running, thanks to better insulation and self-cleaning filters that eliminate the need for manual filter maintenance.
24-Inch Dishwasher Energy Efficiency: The Specifications That Matter
The table below stacks the real-world specs of a standard 24-inch dishwasher against an ENERGY STAR certified model. These figures draw from manufacturer documentation, ENERGY STAR’s certification database, and independent testing.
| Specification | Standard 24-Inch Model | ENERGY STAR 24-Inch Model |
|---|---|---|
| Energy use per cycle | 1.8 kWh (1,200–2,400 watt range) | 1.2–1.8 kWh |
| Water use per cycle | Up to 27 gallons (older units) | 3–5 gallons |
| Annual energy cost | ~$80–$100 | ~$50–$65 |
| Annual water saved | — | 3,870 gallons vs. non-certified |
| Noise level (typical) | 45–55 dBA | From 44 dBA (Bosch class) |
| Capacity | 8+ place settings | 8+ place settings |
| Savings vs. standard model | — | 12% energy, 30% water |
How to Verify a Dishwasher’s Energy Rating
The fastest way to confirm efficiency is to spot the blue ENERGY STAR label on the product page or the unit itself. In Canada, the mandatory EnerGuide label displays annual energy consumption in kWh per year — a lower number means better efficiency, per Natural Resources Canada’s official guidance.
ENERGY STAR also runs a searchable product finder that lets you compare certified models by water use, energy consumption, and capacity. For a closer look at the most efficient 24-inch units available today, our roundup of the best 24-inch dishwashers ranks the top contenders by efficiency rating, noise level, and real-world value.
Energy-Saving Habits That Cut Your Utility Bill
Even the most efficient dishwasher wastes power if it runs half-empty or with the wrong settings. The five habits below, compiled from utility-company guidance and ENERGY STAR recommendations, deliver the biggest returns for the smallest effort.
| Action | Energy Impact | Best Use |
|---|---|---|
| Run only full loads | Eliminates half-empty cycle waste | Every load |
| Skip pre-rinsing | Saves water and the energy to heat it | Modern detergents handle soil |
| Use air dry / no-heat setting | Cuts drying energy by 100% | Overnight or non-urgent loads |
| Delay start to off-peak hours | Lowers cost on Time-of-Use rate plans | TOU electricity customers |
| Use soil-level sensors | Adjusts cycle to actual load | Mixed soil levels |
Save On Energy’s dishwasher buying guide provides extra detail on how each habit translates to annual savings. Combined, those two changes can knock $30–$50 off the annual utility bill on an already efficient model.
What Dishwasher Habits Waste the Most Energy?
Three common routines silently undo the efficiency gains of a modern 24-inch dishwasher. Running partial loads is the biggest offender — a half-empty cycle uses nearly the same energy as a full one. Pre-rinsing dishes under hot running water wastes both water and the energy used to heat it, and modern detergent formulations are designed to dissolve food particles without that step. Ignoring the settings panel also costs money: many households leave the heat-dry default on when the no-heat air dry setting would save power without damaging dishes.
Material safety matters too. Putting wood, cast iron, insulated mugs, or delicate crystal in the dishwasher can damage both the items and the machine, leading to repair or replacement costs that erase any efficiency savings. Stick to dishwasher-safe materials and check the manufacturer’s guide when in doubt.
What to Look For in an Efficient 24-Inch Dishwasher
Three features separate a genuinely efficient 24-inch dishwasher from an average one: ENERGY STAR certification (the “Most Efficient” tier is even better), a per-cycle energy use at or below 1.5 kWh, and water consumption under 4 gallons per load. Brands like Bosch, LG, Samsung, Whirlpool, and GE all offer models that hit these targets. The upfront price premium for an ENERGY STAR model typically pays for itself within two to three years through lower utility bills. For households with Time-of-Use electricity rates, combining an efficient machine with overnight delay-start scheduling can push those annual savings even higher.
FAQs
How many kWh does a dishwasher use per month?
A 24-inch dishwasher running five full cycles per week at 1.5 kWh per cycle uses about 30 kWh per month. At the average U.S. electricity rate, that adds roughly $4.50 to $5.00 to the monthly utility bill — less with an ENERGY STAR model and air-dry settings enabled.
Is it cheaper to run a dishwasher at night?
If your utility provider offers Time-of-Use (TOU) electricity rates, running the dishwasher during off-peak hours — typically late evening or overnight — can cut the per-cycle energy cost by 20–40 percent. Check your electric bill for your provider’s specific TOU rate periods.
Does pre-rinsing dishes save energy in the dishwasher?
Pre-rinsing under hot running water wastes both water and the energy used to heat it. Modern dishwashers and detergent formulations handle food residue without pre-rinsing, so skipping that step saves resources without affecting how clean the dishes come out.
What’s the difference between ENERGY STAR and “Most Efficient”?
ENERGY STAR certification means the model meets the U.S. EPA’s efficiency criteria. The “Most Efficient” tier recognizes the top-performing units within that group — typically the 10–15 percent of models that deliver the best energy and water savings in their category.
How long do energy-efficient dishwashers last?
Most 24-inch dishwashers from major brands have a lifespan of 9 to 12 years with regular maintenance. ENERGY STAR models use the same mechanical components as standard models, so the efficiency upgrade does not reduce longevity.
References & Sources
- Save On Energy. “Buying Guide: Energy-efficient dishwashers.” Covers optimal usage steps, ENERGY STAR savings data, and water use comparisons.
- Natural Resources Canada. “Appliances — EnerGuide.” Official documentation on the EnerGuide label and annual kWh ratings.
- ENERGY STAR. “Certified Dishwashers Product Finder.” Searchable database of certified models with efficiency specifications.
- Consumer Reports. “24-Inch Dishwashers Ratings.” Testing data on 24-inch models current as of January 2026.