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American GUC-30 4**

American GUC-30 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 GUC-30 4**.

Storage volume
29gallons
UEF
0.59Uniform energy factor
First-hour rating
62gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

American GUC-30 4**: advertised and certified
American GUC-30 4**: advertised and certified Size: advertised 30 gal, certified 29 gal (advertised nominal size, certified storage volume). Size: advertised 29 gal, certified 29 gal (certified storage volume). UEF: advertised 0.59, certified 0.59. First-hour rating: advertised 62 gal, certified 62 gal. Size · advertised nominal size, certified storage volume Advertised 30 gal Certified 29 gal Size · certified storage volume Advertised 29 gal Certified 29 gal UEF Advertised 0.59 Certified 0.59 First-hour rating Advertised 62 gal Certified 62 gal
FigureAdvertisedCertifiedAdvertiserRead
Size 30 gal, nominal size 29 gal storage volume American Read Oct 5, 2026
Size 29 gal 29 gal storage volume American Read Oct 5, 2026
UEF 0.59 0.59 American Read Oct 5, 2026
First-hour rating 62 gal 62 gal American Read Oct 5, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
GU101 30T30 4**290.596279%Medium
GU6130T30 4**290.596279%Medium

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

It holds 29 gallons in the test, 1 gallon less than its 30-gallon sold size. Over one hour from a full tank, it gave 62 gallons in the test (its first-hour rating). That is 33 gallons more than its tank holds, since it reheats during the hour. Among 763 gas storage models, 671 have a higher first-hour rating. The median gas storage model gives 78 gallons in the first hour of the test.

As of Oct 26, 2026, it was not listed as ENERGY STAR certified. In tests, 59% of the energy went to hot water, so its UEF is 0.59. Its test ran at the medium level of daily hot water use. Its UEF is lower than that of 185 of the 288 gas storage models with its draw pattern. For its type and draw pattern, the median UEF is 0.60. When it reheats water in the test, 79% of the energy it uses ends up in the water.

It is sold as GU101 30T30 4** and GU6130T30 4**. Its test figures match those of 4 other basic models. They are listed under 4 other brands, one each. For the full group, see the A. O. Smith GUC-30 4**.

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.