Ariston ENS40H-DR***
Ariston ENS40H-DR*** 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 ENS40H-DR***.
Certified figures
- Storage volume
- 36gallons
- UEF
- 0.92Uniform energy factor
- First-hour rating
- 58gallonsHot water in the first hour
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| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| ESDR40T-* | 36 | 0.92 | 58 | 98% | Medium |
UEF is the uniform energy factor. A dash means the model has no such figure.
It holds 36 gallons in the test, 4 gallons less than its 40-gallon sold size. It delivers 58 gallons of hot water in the test's first hour. That is 22 gallons more than its tank holds, since it reheats during the hour. Among 477 electric storage models, 168 have a higher first-hour rating. Among electric storage models, the median first-hour rating is 55 gallons.
In the test, 8% of its energy does not reach the hot water (UEF 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. For its type and draw pattern, its UEF sits at the median. The water took in 98% of the energy used to reheat it (its recovery efficiency).
All of its test figures are shared by 3 other basic models. Of those, one or more are under the AMERICAN STANDARD WATER HEATERS, GE, and Lennox brands. For the full group, see the AMERICAN STANDARD WATER HEATERS ENS40H-DR***.
Also listed as
They carry every figure in the table above.
- Every Ariston basic model
- Every 40-gallon electric storage water heater
- Every electric storage water heater
Not covered
- Advertised figures. We have none on file for this model.