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American GUR 40 4**

American GUR 40 4** is in the DOE listing as of Oct 26, 2026.

  • Gas storage water heater
  • 2 listed models

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

Its figures are also listed under A. O. Smith G9-UT4040NVR 5**.

Storage volume
38gallons
UEF
0.64Uniform energy factor
First-hour rating
83gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

American GUR 40 4**: advertised and certified
American GUR 40 4**: 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 0.64, certified 0.64. First-hour rating: advertised 83 gal, certified 83 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 0.64 Certified 0.64 First-hour rating Advertised 83 gal Certified 83 gal
FigureAdvertisedCertifiedAdvertiserRead
Size 40 gal, nominal size 38 gal storage volume American Read Oct 5, 2026
Size 38 gal 38 gal storage volume American Read Oct 5, 2026
UEF 0.64 0.64 American Read Oct 5, 2026
First-hour rating 83 gal 83 gal American Read Oct 5, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
GU62 40T40R 4**380.648377%High
GU82 40T40R 4**380.648377%High

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. Over one hour from a full tank, it gave 83 gallons in the test (its first-hour rating). Its tank holds 38 gallons, so reheating adds 45 gallons during the first hour. In the first hour, 242 of the 763 gas storage models give more hot water. The median gas storage model gives 78 gallons in its first hour.

It was not listed as ENERGY STAR certified on Oct 26, 2026. In tests, 64% of the energy it uses ends up as hot water (UEF 0.64). Its test simulated a day of high hot water use (its draw pattern). Its UEF is lower than that of 255 of the 434 gas storage models with its draw pattern. A UEF of 0.66 is the median for its type and draw pattern. When it reheats water in the test, 77% of the energy it uses ends up in the water.

It is the basic model for GU62 40T40R 4** and GU82 40T40R 4**. All of its test figures are shared by 9 other basic models. Besides this brand, 4 brands list one or more of them. You can find the whole group on the page for the A. O. Smith G9-UT4040NVR 5**.

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.