Model
Thermador T18IF900SP
Rank #320 means 319 of the 622 freezer models we track cost less to run each year; the 21st efficiency percentile means it uses less energy for its size than 21% of those models.
What does the Thermador T18IF900SP cost to run per year?
The Thermador T18IF900SP holds rank #320 of 622 on running cost, at about $78 a year, an unremarkable but typical figure for the class. It uses 17% less energy than the U.S. federal standard model in its class, which would cost about $92/yr to run, a saving of roughly $14 a year. Capacity-normalized, it ranks ahead of just 21% of freezer models we track, a soft spot worth weighing against the dollar figure. This class has no published efficiency-factor figure beyond annual kWh itself, so at 8.6 cu ft (the class spans 1.1 to 23), size is the clearest lever we can point to for this model's running cost.
Immediately around it on the leaderboard, the Miele F 2411 Vi at $78/yr runs a little cheaper and the Thermador T18IF901SP at $78/yr runs a little more, a sense of how tightly models are packed at this point in the ranking. A freezer typically stays in service for somewhere around 14 years; over that span, the Thermador T18IF900SP's $78/yr adds up to roughly $1092 in electricity alone, before purchase price or repairs.
Also sold as: Bosch B18IF900SP.
By the numbers
The Thermador T18IF900SP 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 $78/yr, here is what the Thermador T18IF900SP adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Thermador T18IF900SP costs about $780. That is roughly $140 less than a standard model in its class, which would run closer to $920 over the same ten years.
How the Thermador T18IF900SP compares
The freezer class we track runs from $25 to $120 a year. At $78/yr, it runs about $3 a year above the class median of $75, and it is about $53 a year more than the cheapest freezer to run at $25. Against the US federal standard model for its class at about $92/yr, the Thermador T18IF900SP uses 17% less energy.
What drives its running cost
At 8.6 cu ft, the Thermador T18IF900SP is a small freezer for its class, which spans 1.1 to 23 cu ft with a median of 13.8 cu ft, at the small end of the class, capacity itself is doing a lot of the work to keep that figure down, separate from how efficient the unit actually is.
- Interior volume. As with refrigerators, more cubic feet of frozen storage generally means a bigger compressor and a higher annual energy figure.
- Insulation and defrost type. Better-insulated cabinets lose less cold to the surrounding room, and frost-free (automatic-defrost) freezers run a periodic heating element that a manual-defrost model does not.
- Chest vs upright design. Door orientation affects how much cold air escapes per opening: top-opening chest designs generally hold cold better than front-opening upright ones.
Common questions
Is the Thermador T18IF900SP cheap to run?
Roughly, yes. Its $78/yr figure is close to the class median, ranking #320 of 622, neither a bargain nor a splurge on running cost.
How much does the Thermador T18IF900SP cost per month?
About $6.47 a month, which is the $78 annual estimate spread across twelve months at the US average rate of $0.1856/kWh. Your own bill scales with your local electricity rate and how heavily you use it.
How is this running-cost figure calculated?
The formula is annual kWh times price per kWh: 418 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $78 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Thermador T18IF900SP for its size?
21st percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 324 | Miele F 2411 Vi8.6 cu ft | $78 |
| 323 | Miele F 2411 SF8.6 cu ft | $78 |
| 322 | Liebherr MF 246111.5 cu ft | $78 |
| 321 | Gaggenau RF4117048.6 cu ft | $78 |
| 320 | Bosch B18IF900SP8.6 cu ft | $78 |
Source
ES_0031649_T18IF900SP_03082017044344_70122368View certified freezer listingsENERGY STAR data as of July 2026Thermador and T18IF900SP 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.