Ariston ENS30T-*
Ariston ENS30T-* is in the DOE listing as of Oct 19, 2026.
- Electric storage water heater
- 2 listed models
ENERGY STAR certification does not cover this type of water heater.
Its figures are also listed under AMERICAN STANDARD WATER HEATERS ENS30T-*.
Certified figures
- Storage volume
- 27gallons
- UEF
- 0.92Uniform energy factor
- First-hour rating
- 41gallonsHot water in the first hour
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| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| ES30M* | 27 | 0.92 | 41 | 98% | Low |
| LCE30M* | 27 | 0.92 | 41 | 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 41 gallons of hot water in the test's first hour. Reheating lets it give 14 gallons beyond the 27 gallons in its tank. Among 477 electric storage models, 429 have a higher first-hour rating. Among electric storage models, the median first-hour rating is 55 gallons.
In tests, 92% of the energy went to hot water, so its UEF is 0.92. Its test simulated a day of low hot water use (its draw pattern). Among 157 electric storage models on its draw pattern, 12 have a higher UEF. For its type and draw pattern, its UEF sits at the median. When it reheats water in the test, 98% of the energy it uses ends up in the water.
It is sold as ES30M* and LCE30M*. Its test figures match those of 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 ENS30T-*.
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.