DoesTheMath

AMERICAN STANDARD WATER HEATERS GN50T2-3-* vs ARISTON GSN50T1-3-*: which uses less energy?

At the high draw pattern the AMERICAN STANDARD WATER HEATERS GN50T2-3-* uses 256 therms a year and the ARISTON GSN50T1-3-* 260 — 4 therms (2%) less, about 39 therms over ten years. Both are filed as a gas tank, so the comparison holds. Enter your ZIP below to price the difference.

Side by side

Compared within one class only: models filed as a gas tank at the high draw pattern.

Filed and computed figures
AMERICAN STANDARD WATER HEATERS GN50T2-3-* ARISTON GSN50T1-3-*
UEF (Uniform Energy Factor) 0.66 (better) 0.65
Energy use per year (therms) 256 (better) 260
First hour rating (gal) 86 86
Rated storage volume (gal) 47 47
Installed cost range $1,892–$3,395 $1,834–$3,245
ENERGY STAR certified not matched not matched
DOE CCD · 2026-09-19

What it costs to run

AMERICAN STANDARD WATER HEATERS GN50T2-3-*: 256 therms a year ARISTON GSN50T1-3-*: 260 therms a year

AMERICAN STANDARD WATER HEATERS GN50T2-3-* — 256 therms a year ARISTON GSN50T1-3-* — 260 therms a year

AMERICAN STANDARD WATER HEATERS GN50T2-3-* is 4 therms a year lower than ARISTON GSN50T1-3-*.

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 AMERICAN STANDARD WATER HEATERS GN50T2-3-* if running cost matters most: it uses 4 therms less a year on the same test.
  • Pick the ARISTON GSN50T1-3-* if it is the one you can get installed sooner or for less — on the filed figures it has no advantage over the AMERICAN STANDARD WATER HEATERS GN50T2-3-*.
  • Neither if your household's busiest hour needs more than 86 gallons of hot water — neither lists more. Check whether a 50-gallon heater is enough.

Each model on its own

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