Running cost for the Sub-Zero DEU2450B*/ADA/*
The Sub-Zero DEU2450B*/ADA/* is certified by ENERGY STAR at 215 kWh a year, one of the cheaper models in its category to run among refrigerators currently certified.
That $40 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 refrigerator
Against the category average of 386 kWh/yr, this model uses 44.3% less, ranking 591 of 4,704 refrigerators tracked here for running cost. That average is drawn from all 4,704 refrigerators ENERGY STAR currently certifies, not an outside number, a $32/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 Sub-Zero DEU2450B*/ADA/*: Professional Series PS-CRF939US-IN ($40/yr, 215 kWh/yr), then TCL TRM31S4AW ($40/yr, 215 kWh/yr).
Comparing Sub-Zero's own models
Ranked 6 of Sub-Zero's 26 certified refrigerators, this sits between the DEU2450R/ADA/* ($30/yr, the brand's cheapest) and the CL4850S/S/* ($140/yr, its priciest).
Cost over its typical lifespan
13 years is NAHB's typical service life for this category; at $40/year, the Sub-Zero DEU2450B*/ADA/* adds up to about $525 in electricity over that span.
Is it worth replacing?
Efficient as certified refrigerators go, $40/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
$40/year to run is the predictable cost of the Sub-Zero DEU2450B*/ADA/*; a protection plan covers the unpredictable one, a repair bill.
Where this number comes from
Two sourced numbers, nothing modeled: ENERGY STAR's certified kWh/yr for this exact model, and EIA's published state electricity rate. The full Refrigerator category page shows all 4,704 refrigerators ranked by cost; the state-rate guide covers the half of this number that isn't the appliance.