Model
Marathon MFF184SS
Rank #575 means 574 of the 1,000 refrigerator models we track cost less to run each year; the 89th efficiency percentile means it uses less energy for its size than 89% of those models.
What does the Marathon MFF184SS cost to run per year?
Among the 1,000 refrigerator models we track, the Marathon MFF184SS's $68/yr running cost ranks it #575, close to dead center. It uses 10% less energy than the U.S. federal standard model in its class, which would cost about $76/yr to run, a saving of roughly $8 a year. Size-adjusted, this model beats 89% of refrigerator models we track on efficiency, one of the stronger results in its class. This class has no published efficiency-factor figure beyond annual kWh itself, so at 18.1 cu ft (the class spans 1.2 to 31.7), size is the clearest lever we can point to for this model's running cost.
Immediately around it on the leaderboard, the Hisense RT180N3S*EH at $68/yr runs a little cheaper and the Sh SH513-WW at $68/yr runs a little more, a sense of how tightly models are packed at this point in the ranking. A refrigerator typically stays in service for somewhere around 12 years; over that span, the Marathon MFF184SS's $68/yr adds up to roughly $816 in electricity alone, before purchase price or repairs.
Also sold as: Hisense RT180N3S*EH.
By the numbers
The Marathon MFF184SS 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 $68/yr, here is what the Marathon MFF184SS adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Marathon MFF184SS costs about $680. That is roughly $80 less than a standard model in its class, which would run closer to $760 over the same ten years.
How the Marathon MFF184SS compares
The refrigerator class we track runs from $8 to $149 a year. At $68/yr, it runs about $4 a year above the class median of $64, and it is about $60 a year more than the cheapest refrigerator to run at $8. Against the US federal standard model for its class at about $76/yr, the Marathon MFF184SS uses 10% less energy.
What drives its running cost
At 18.1 cu ft, the Marathon MFF184SS is a large refrigerator for its class, which spans 1.2 to 31.7 cu ft with a median of 12.6 cu ft, and larger refrigerator models generally cost more to run than smaller ones in the same class, simply because there is more to keep cold, spin, heat, or light.
- Interior volume. More cubic feet of cold air to maintain generally means a bigger compressor and a higher running-cost figure, even among efficient models.
- Counter depth vs standard depth. Standard-depth models generally offer more interior volume per unit of width than counter-depth models, a tradeoff between built-in looks and cubic feet.
- Compressor technology. How a compressor cycles, full on/off versus a variable-speed inverter design, is one of the biggest hidden differences behind two fridges with similar cubic feet but different running costs.
- Placement and ventilation. Ventilation clearance around the back and top matters more than most owners expect; a fridge starved of airflow runs its compressor longer to hold the same temperature.
Common questions
Is the Marathon MFF184SS cheap to run?
Roughly, yes. Its $68/yr figure is close to the class median, ranking #575 of 1,000, neither a bargain nor a splurge on running cost.
How much does the Marathon MFF184SS cost per month?
About $5.68 a month, which is the $68 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: 367 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $68 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Marathon MFF184SS for its size?
89th percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 575 | Hisense RT180N3S*EH18.1 cu ft | $68 |
| 574 | Commercial Cool CCR1800GW18.2 cu ft | $68 |
| 573 | Wood'S WFF180W18.2 cu ft | $68 |
| 572 | Lg LT18SO000S17.9 cu ft | $68 |
| 571 | Frigidaire FRTE1835AB18.2 cu ft | $68 |
Source
ES_1137295_MFF184SS_04282026110246_80297847View certified refrigerator listingsENERGY STAR data as of July 2026Marathon and MFF184SS 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.