Ariston ENS50L-6*
Ariston ENS50L-6* is in the DOE listing as of Oct 19, 2026.
- Electric storage water heater
- 1 listed model
ENERGY STAR certification does not cover this type of water heater.
Its figures are also listed under AMERICAN STANDARD WATER HEATERS ENS50L-6*.
Certified figures
- Storage volume
- 42gallons
- UEF
- 0.92Uniform energy factor
- First-hour rating
- 52gallonsHot water in the first hour
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| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| ES50S-S* | 42 | 0.92 | 52 | 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 52 gallons in the test (its first-hour rating). Reheating lets it give 10 gallons beyond the 42 gallons in its tank. In the first hour, 279 of the 477 electric storage models give more hot water. The median electric storage model gives 55 gallons in the first hour of the test.
In tests, 92% of the energy went to hot water, so its UEF is 0.92. Its test ran at the medium level of daily hot water use. Of 297 electric storage models with the same draw pattern, 81 have a higher UEF and 2 a lower one. On its draw pattern, its UEF is also the median electric storage UEF. Of the energy spent to reheat water, 98% goes into it (its recovery efficiency).
There are 2 more basic models with the same test figures. Those basic models are sold with AMERICAN STANDARD WATER HEATERS and Lennox as their brand names. For the full group, see the AMERICAN STANDARD WATER HEATERS ENS50L-6* page.
Also listed as
They carry every figure in the table above.
Not covered
- Advertised figures. We have none on file for this model.