MARATHON MR40245 C
MARATHON MR40245 C is in the DOE listing as of Oct 26, 2026.
It has a certified storage volume of 38 gallons, a certified UEF of 0.92, and a certified first-hour rating of 51 gallons of hot water.
- Electric storage water heater
- 1 listed model
ENERGY STAR certification does not cover this type of water heater.
Certified figures
- Storage volume
- 38gallons
- UEF
- 0.92Uniform energy factor
- First-hour rating
- 51gallonsHot 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 |
|---|---|---|---|---|---|
| MR40245 C | 38 | 0.92 | 51 | 98% | Medium |
UEF is the uniform energy factor. A dash means the model has no such figure.
Over one hour from a full tank, it gave 51 gallons in the test (its first-hour rating). Reheating lets it give 13 gallons beyond the 38 gallons in its tank. Of 477 electric storage models, 286 give more hot water in the first hour. The median electric storage model gives 55 gallons in the first hour of the test.
In tests, 92% of the energy it uses ends up as hot water (UEF 0.92). In the test, daily hot water use was set to medium (its draw pattern). Its UEF is lower than that of 81 of the 297 electric storage models with its draw pattern. On its draw pattern, its UEF is also the median electric storage UEF. When it reheats water in the test, 98% of the energy it uses ends up in the water.
Not covered
- Advertised figures. We have none on file for this model.