Model
Smeg STU8623
Rank #323 means 322 of the 709 dishwasher models we track cost less to run each year; the 47th efficiency percentile means it uses less energy for its size than 47% of those models.
What does the Smeg STU8623 cost to run per year?
At $44 a year to run, the Smeg STU8623 sits close to the middle of its class on cost, ranking #323 of 709 dishwasher models we track. It uses 22.1% less energy than the U.S. federal standard model in its class, which would cost about $57/yr to run, a saving of roughly $13 a year. Its 47th size-adjusted efficiency percentile is unremarkable, close to what a typical model in the class scores. At 13 place settings, it is a mid-size 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 Samsung DW80R995*** at $44/yr runs a little cheaper and the Viking VDWU524WSSS at $44/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 STU8623's $44/yr adds up to roughly $396 in electricity alone, before purchase price or repairs.
Also sold as: Bosch SGE53C56UC.
By the numbers
The Smeg STU8623 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 $44/yr, here is what the Smeg STU8623 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 STU8623 costs about $440. That is roughly $130 less than a standard model in its class, which would run closer to $570 over the same ten years.
How the Smeg STU8623 compares
The dishwasher class we track runs from $15 to $45 a year. At $44/yr, it sits right on the class median of $44, and it is about $29 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 STU8623 uses 22.1% less energy.
What drives its running cost
At 13 place settings, the Smeg STU8623 is a mid-size dishwasher for its class, which spans 2 to 18 place settings with a median of 14 place settings, putting it squarely in the middle of the class on the size lever that drives most of the cost.
- 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 STU8623 cheap to run?
It is about average. At $44 a year it ranks #323 of 709 dishwasher models we track, close to the middle of its class on running cost.
How much does the Smeg STU8623 cost per month?
Roughly $3.7/mo, spreading the $44/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 239 kWh from ENERGY STAR and multiply it by the US average residential electricity rate of $0.1856/kWh, giving about $44 a year. It is an electricity-only estimate and does not include purchase price, water, or installation.
How efficient is the Smeg STU8623 for its size?
47th percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
Source
ES_92281_STU8623_02272024152902_6504327View certified dishwasher listingsENERGY STAR data as of July 2026Smeg and STU8623 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.