Ariston ENS30LU-*
Ariston ENS30LU-* 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 ENS30LU-*.
Certified figures
- Storage volume
- 27gallons
- UEF
- 0.93Uniform energy factor
- First-hour rating
- 40gallonsHot water in the first hour
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| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| ES30S* | 27 | 0.93 | 40 | 98% | Low |
UEF is the uniform energy factor. A dash means the model has no such figure.
It holds 27 gallons in the test, 3 gallons less than its 30-gallon sold size. It delivers 40 gallons of hot water in the test's first hour. Its tank holds 27 gallons, so reheating adds 13 gallons during the first hour. Among 477 electric storage models, 444 have a higher first-hour rating. Among electric storage models, the median first-hour rating is 55 gallons.
In tests, 93% of the energy it uses ends up as hot water (UEF 0.93). Its test ran at the low level of daily hot water use. Its UEF is lower than that of 2 of the 157 electric storage models with its draw pattern. For its type and draw pattern, the median UEF is 0.92. The water took in 98% of the energy used to reheat it (its recovery efficiency).
All of its test figures are shared by 2 other basic models. Those basic models are sold with AMERICAN STANDARD WATER HEATERS and Lennox as their brand names. You can find the whole group on the page for the AMERICAN STANDARD WATER HEATERS ENS30LU-*.
Also listed as
They carry every figure in the table above.
- Every Ariston basic model
- Every 30-gallon electric storage water heater
- Every electric storage water heater
Not covered
- Advertised figures. We have none on file for this model.