MARATHON MRG105245
MARATHON MRG105245 is in the DOE listing as of Oct 26, 2026.
It has a certified storage volume of 101 gallons, a certified UEF of 0.90, and a certified first-hour rating of 83 gallons of hot water.
- Grid-enabled water heater
- 2 listed models
ENERGY STAR certification does not cover this type of water heater.
Certified figures
- Storage volume
- 101gallons
- UEF
- 0.90Uniform energy factor
- First-hour rating
- 83gallonsHot water in the first hour
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Change your hourCertified figures by listed model
| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| MRG105238 | 101 | 0.90 | 83 | 98% | High |
| MRG105245 | 101 | 0.90 | 83 | 98% | High |
UEF is the uniform energy factor. A dash means the model has no such figure.
It delivers 83 gallons of hot water in the test's first hour. Of 21 grid-enabled models, 12 give more hot water in the first hour. The median grid-enabled model gives 85 gallons in the first hour of the test.
In tests, 90% of the energy it uses ends up as hot water (UEF 0.90). Its test ran at the high level of daily hot water use. Of 21 grid-enabled models with the same draw pattern, 15 have a higher UEF. A UEF of 0.92 is the median for its type and draw pattern. When it reheats water in the test, 98% of the energy it uses ends up in the water.
It is sold as MRG105238 and MRG105245. There is one more basic model with the same test figures. That one carries the Ruud brand name.
Also listed as
They carry every figure in the table above.
Not covered
- Advertised figures. We have none on file for this model.