Model
Thermador T18ID900LP
Rank #334 means 333 of the 622 freezer models we track cost less to run each year; the 14th efficiency percentile means it uses less energy for its size than 14% of those models.
What does the Thermador T18ID900LP cost to run per year?
At $79 a year to run, the Thermador T18ID900LP sits close to the middle of its class on cost, ranking #334 of 622 freezer models we track. It uses 13% less energy than the U.S. federal standard model in its class, which would cost about $89/yr to run, a saving of roughly $10 a year. Its 14th size-adjusted efficiency percentile is well below the class median, worth weighing against the raw cost figure above. At 7.8 cu ft, it is a small freezer for the class, which runs 1.1 to 23 cu ft; 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 Miele F 2472 Vi at $79/yr runs a little cheaper and the Thermador T18ID900RP at $79/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 T18ID900LP's $79/yr adds up to roughly $1106 in electricity alone, before purchase price or repairs.
Also sold as: Thermador T18ID900RP, Thermador T18ID905LP.
By the numbers
The Thermador T18ID900LP 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 $79/yr, here is what the Thermador T18ID900LP 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 T18ID900LP costs about $790. That is roughly $100 less than a standard model in its class, which would run closer to $890 over the same ten years.
How the Thermador T18ID900LP compares
The freezer class we track runs from $25 to $120 a year. At $79/yr, it runs about $4 a year above the class median of $75, and it is about $54 a year more than the cheapest freezer to run at $25. Against the US federal standard model for its class at about $89/yr, the Thermador T18ID900LP uses 13% less energy.
What drives its running cost
At 7.8 cu ft, the Thermador T18ID900LP is a small freezer for its class, which spans 1.1 to 23 cu ft with a median of 13.8 cu ft, less capacity to service is usually the first reason a running-cost figure lands on the low side, before efficiency even enters the picture.
- Interior volume. Cubic feet of frozen storage is the first lever behind a freezer's running cost, ahead of insulation or defrost type.
- Insulation and defrost type. Two freezers of the same size can differ meaningfully on running cost based on insulation quality and whether they run an automatic-defrost heater.
- Chest vs upright design. Chest freezers open from the top, so cold air, which sinks, stays inside when the lid opens; upright freezers lose more cold air per door opening for a similar capacity.
Common questions
Is the Thermador T18ID900LP cheap to run?
It is about average. At $79 a year it ranks #334 of 622 freezer models we track, close to the middle of its class on running cost.
How much does the Thermador T18ID900LP cost per month?
Roughly $6.62/mo, spreading the $79/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 428 kWh from ENERGY STAR and multiply it by the US average residential electricity rate of $0.1856/kWh, giving about $79 a year. It is an electricity-only estimate and does not include purchase price, water, or installation.
How efficient is the Thermador T18ID900LP for its size?
14th percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 333 | Miele F 2472 Vi7.8 cu ft | $79 |
| 332 | Miele F 2471 Vi7.8 cu ft | $79 |
| 331 | Miele F 2471 SF7.8 cu ft | $79 |
| 330 | Miele F 2461 Vi7.8 cu ft | $79 |
| 329 | Frigidaire FFUE2024A*20 cu ft | $79 |
Source
ES_0031649_T18ID900LP_03082017044344_70122368View certified freezer listingsENERGY STAR data as of July 2026Thermador and T18ID900LP 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.