DoesTheMath

AMERICAN STANDARD WATER HEATERS ENS30T-* vs Lennox WHES030L45TN240S****: which uses less energy?

At the low draw pattern the Lennox WHES030L45TN240S**** uses 2,413 kWh a year and the AMERICAN STANDARD WATER HEATERS ENS30T-* 2,439 — 26 kWh (1%) less, about 262 kWh over ten years. Both are filed as an electric tank, so the comparison holds. Enter your ZIP below to price the difference.

Side by side

Compared within one class only: models filed as an electric tank at the low draw pattern.

Filed and computed figures
AMERICAN STANDARD WATER HEATERS ENS30T-* Lennox WHES030L45TN240S****
UEF (Uniform Energy Factor) 0.92 0.93 (better)
Energy use per year (kWh) 2,439 2,413 (better)
First hour rating (gal) 41 40
Rated storage volume (gal) 27 27
Installed cost range $1,461–$1,577 $1,467–$1,793
ENERGY STAR certified not matched not matched
DOE CCD · 2026-09-19

What it costs to run

AMERICAN STANDARD WATER HEATERS ENS30T-*: 2,439 kWh a year Lennox WHES030L45TN240S****: 2,413 kWh a year

AMERICAN STANDARD WATER HEATERS ENS30T-* — 2,439 kWh a year Lennox WHES030L45TN240S**** — 2,413 kWh a year

Lennox WHES030L45TN240S**** is 26 kWh a year lower than AMERICAN STANDARD WATER HEATERS ENS30T-*.

DOE CCD · 2026-09-19

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Reliability

Not published: Reliability, failure rates and each model’s actual warranty term.

The registries these figures come from certify energy performance under a federal test; none of them records how long a unit lasts or how often it fails, so this page does not rank the two on reliability.

What is here instead:

  • The filed efficiency, capacity and tank size of both models, side by side below.
  • The actual warranty term is printed in each model’s documentation, not in any registry.

Which should you pick?

  • Pick the Lennox WHES030L45TN240S**** if running cost matters most: it uses 26 kWh less a year on the same test.
  • Pick the AMERICAN STANDARD WATER HEATERS ENS30T-* if you need more hot water in your busiest hour: it lists a first hour rating of 41 gallons against 40.
  • Neither if your household's busiest hour needs more than 41 gallons of hot water — neither lists more. Check whether a 30-gallon heater is enough.

Each model on its own

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