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AMERICAN STANDARD WATER HEATERS GN40T1-3-*

AMERICAN STANDARD WATER HEATERS GN40T1-3-* is in the DOE listing as of Oct 26, 2026.

It has a labeled size of 40 gallons, a certified storage volume of 38 gallons, a certified UEF of 0.59, and a certified first-hour rating of 68 gallons of hot water.

Its advertised UEF of 0.59 from AMERICAN STANDARD WATER HEATERS matches the certified 0.59 (Read Oct 5, 2026).

  • Gas storage water heater
  • 1 listed model

Not listed as ENERGY STAR certified on Oct 26, 2026.

Storage volume
38gallons
UEF
0.59Uniform energy factor
First-hour rating
68gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

AMERICAN STANDARD WATER HEATERS GN40T1-3-*: advertised and certified
AMERICAN STANDARD WATER HEATERS GN40T1-3-*: advertised and certified Size: advertised 40 gal, certified 38 gal (advertised nominal size, certified storage volume). Size: advertised 38 gal, certified 38 gal (certified storage volume). UEF: advertised 0.59, certified 0.59. First-hour rating: advertised 68 gal, certified 68 gal. Size · advertised nominal size, certified storage volume Advertised 40 gal Certified 38 gal Size · certified storage volume Advertised 38 gal Certified 38 gal UEF Advertised 0.59 Certified 0.59 First-hour rating Advertised 68 gal Certified 68 gal
FigureAdvertisedCertifiedAdvertiserRead
Size 40 gal, nominal size 38 gal storage volume AMERICAN STANDARD WATER HEATERS Read Oct 5, 2026
Size 38 gal 38 gal storage volume AMERICAN STANDARD WATER HEATERS Read Oct 5, 2026
UEF 0.59 0.59 AMERICAN STANDARD WATER HEATERS Read Oct 5, 2026
First-hour rating 68 gal 68 gal AMERICAN STANDARD WATER HEATERS Read Oct 5, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
GN40T1-3-*380.596874%Medium

UEF is the uniform energy factor. A dash means the model has no such figure.

It holds 38 gallons in the test, 2 gallons less than its 40-gallon sold size. Starting full, it gives 68 gallons of hot water in its first hour of use. Its tank holds 38 gallons, so reheating adds 30 gallons during the first hour. In the first hour, 529 of the 763 gas storage models give more hot water. The median gas storage model gives 78 gallons in its first hour.

As of Oct 26, 2026, it was not listed as ENERGY STAR certified. In tests, 59% of the energy it uses ends up as hot water (UEF 0.59). The daily hot water use in the test, called its draw pattern, was medium. Of 288 gas storage models with the same draw pattern, 185 have a higher UEF and 58 a lower one. On its draw pattern, the median gas storage UEF is 0.60. The water took in 74% 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 Ariston and Lennox as their brand names.

Also listed as

They carry every figure in the table above.

Updated Oct 26, 2026 · Methodology

Not covered

  • Changes to an advertised figure after the date beside it.