AMERICAN STANDARD WATER HEATERS ENS40LUB 240V-3500W vs VAUGHN ME-40: which uses less energy?

At the low draw pattern the AMERICAN STANDARD WATER HEATERS ENS40LUB 240V-3500W and the VAUGHN ME-40 use the same energy, 2,439 kWh a year each, on the same federal test. Both are filed as an electric tank, so the comparison holds; what separates them is below. Enter your ZIP to price either one on your own rate.

Side by side

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

Filed and computed figures
Figure	AMERICAN STANDARD WATER HEATERS ENS40LUB 240V-3500W	VAUGHN ME-40
UEF (Uniform Energy Factor)	0.92	0.92
Energy use per year (kWh)	2,439	2,439
First hour rating (gal)	39	46
Rated storage volume (gal)	36	37
Installed cost range	$1,591–$1,802	$1,605–$1,828
ENERGY STAR certified	not matched	not matched

DOE CCD · 2026-09-19

What it costs to run

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 AMERICAN STANDARD WATER HEATERS ENS40LUB 240V-3500W if its price or availability suits you — on energy the two are level.
Pick the VAUGHN ME-40 if you need more hot water in your busiest hour: it lists a first hour rating of 46 gallons against 39.
Neither if your household's busiest hour needs more than 46 gallons of hot water — neither lists more. Check whether a 40-gallon heater is enough.

Each model on its own

AMERICAN STANDARD WATER HEATERS ENS40LUB 240V-3500W

Its filed figures, class position and running cost on your ZIP.
VAUGHN ME-40

Its filed figures, class position and running cost on your ZIP.