Smeg STU2FABBL2: running cost
At 224 kWh/yr, the Smeg STU2FABBL2's ENERGY STAR certification puts it about average for its category to run against every other certified dishwasher.
That $42 is priced at 18.8¢/kWh, the average of all 51 state rates this site tracks. Your own state's rate is one click away.
Efficient, or not, for a dishwasher
Against the category average of 232 kWh/yr, this model uses 3.4% less, ranking 102 of 737 dishwashers tracked here for running cost. That average is drawn from all 737 dishwashers ENERGY STAR currently certifies, not an outside number, a $2/year gap from this model at the national rate. Full sourcing is in the sourcing notes.
Right next to it on the list
A rank or two either side of the Smeg STU2FABBL2: Fisher&Paykel DW24UNT2X2 ($42/yr, 224 kWh/yr), then Beko BDDDT48340**** ($42/yr, 225 kWh/yr).
Comparing Smeg's own models
Ranked 2 of Smeg's 9 certified dishwashers, this sits between the DW8630 ($41/yr, the brand's cheapest) and the STU8623 ($45/yr, its priciest).
What this adds up to over time
9 years is NAHB's typical service life for this category; at $42/year, the Smeg STU2FABBL2 adds up to about $379 in electricity over that span.
Is it worth replacing?
Efficient as certified dishwashers go, $42/year is a reasonable baseline if you're comparing what else is on the market.
Worth comparing a few current certified models before deciding.
If you're keeping it
$42/year to run is the predictable cost of the Smeg STU2FABBL2; a protection plan covers the unpredictable one, a repair bill.
Where this number comes from
Nothing here is estimated from a nameplate wattage; the 224 kWh/yr is ENERGY STAR's own certified figure for this model. Ranked 102 of 737, the Smeg STU2FABBL2 sits in the middle of the dishwasher category, see the guide to why your state changes this number for the other half of the math.