Model
Smeg STU1822
Rank #198 means 197 of the 709 dishwasher models we track cost less to run each year; the 10th efficiency percentile means it uses less energy for its size than 10% of those models.
What does the Smeg STU1822 cost to run per year?
At $43 a year to run, the Smeg STU1822 runs cheaper than most models in its class, ranking #198 of 709 dishwasher models we track. It uses 23.8% less energy than the U.S. federal standard model in its class, which would cost about $57/yr to run, a saving of roughly $14 a year. Once capacity is factored in, its efficiency percentile of 10 is among the lowest in its class. At 8 place settings, it is a small dishwasher for the class, which runs 2 to 18 place settings; size and efficiency are the two levers behind the figure above, and this dataset does not carry a separate efficiency-factor column for this class.
Immediately around it on the leaderboard, the Smeg DW8601X at $43/yr runs a little cheaper and the Spt SD-9254SS at $43/yr runs a little more, a sense of how tightly models are packed at this point in the ranking. A dishwasher typically stays in service for somewhere around 9 years; over that span, the Smeg STU1822's $43/yr adds up to roughly $387 in electricity alone, before purchase price or repairs.
Also sold as: Edgestar BIDW1802**.
By the numbers
The Smeg STU1822 normalized against its whole class, so each figure means something.
What it costs you over time
Running cost is an every-year number, so it compounds. At $43/yr, here is what the Smeg STU1822 adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Smeg STU1822 costs about $430. That is roughly $140 less than a standard model in its class, which would run closer to $570 over the same ten years.
How the Smeg STU1822 compares
The dishwasher class we track runs from $15 to $45 a year. At $43/yr, it runs about $1 a year cheaper than the class median of $44, and it is about $28 a year more than the cheapest dishwasher to run at $15. Against the US federal standard model for its class at about $57/yr, the Smeg STU1822 uses 23.8% less energy.
What drives its running cost
At 8 place settings, the Smeg STU1822 is a small dishwasher for its class, which spans 2 to 18 place settings with a median of 14 place settings, less capacity to service is usually the first reason a running-cost figure lands on the low side, before efficiency even enters the picture.
- Place-setting capacity. A larger dishwasher heats more water per cycle, so bigger capacity generally means a higher annual energy figure, independent of how efficient the unit is.
- Water heating. The booster heater that brings water up to sanitizing temperature is usually the single largest electrical load in a dishwasher's cycle.
- Cycle length and drying method. Cycle selection, eco versus heavy, air-dry versus heated-dry, moves real running cost more than most owners realize for a given capacity.
Common questions
Is the Smeg STU1822 cheap to run?
Yes, relatively. At $43 a year it ranks #198 of 709 dishwasher models we track, in the cheaper part of its class to run.
How much does the Smeg STU1822 cost per month?
Roughly $3.62/mo, spreading the $43/yr estimate evenly across twelve months at $0.1856/kWh. Actual monthly bills swing with your rate and usage pattern.
How is this running-cost figure calculated?
We take the model's published annual energy use of 234 kWh from ENERGY STAR and multiply it by the US average residential electricity rate of $0.1856/kWh, giving about $43 a year. It is an electricity-only estimate and does not include purchase price, water, or installation.
How efficient is the Smeg STU1822 for its size?
10th percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
Source
ES_92281_STU1822_090820241911548_8072810View certified dishwasher listingsENERGY STAR data as of July 2026Smeg and STU1822 are used here for identification only and are not endorsements. Figures are computed by WattWise Labs from public ENERGY STAR data, not measured in our own lab.