Summit ADADW18B: running cost
The Summit ADADW18B is certified by ENERGY STAR at 234 kWh a year, about average for its category to run among dishwashers currently certified.
That $44 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
The category average is 232 kWh/yr; this model runs 0.9% above it, ranking 254 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 $0/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 Summit ADADW18B: SPT SD-9254W ($44/yr, 234 kWh/yr), then Summit ADADW18NT ($44/yr, 234 kWh/yr).
Comparing Summit's own models
Ranked 2 of Summit's 33 certified dishwashers, this sits between the DW18SS4 ($41/yr, the brand's cheapest) and the LDW24WA ($44/yr, its priciest).
Summit ADADW18B over 9 years
NAHB's Study of Life Expectancy of Home Components puts a typical dishwasher's service life at 9 years; run the Summit ADADW18B that long and it costs about $396 in electricity, on top of whatever it cost to buy.
Is it worth replacing?
Efficient as certified dishwashers go, $44/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
A dishwasher like the Summit ADADW18B is a real household expense whether or not it needs replacing yet; a protection plan is one way to budget for a repair rather than a full replacement.
Where this number comes from
Nothing here is estimated from a nameplate wattage; the 234 kWh/yr is ENERGY STAR's own certified figure for this model. The full Dishwasher category page shows all 737 dishwashers ranked by cost; the state-rate guide covers the half of this number that isn't the appliance.