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State GUC-30 4**

State 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

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

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
GS X 30 ORUT 4**290.596279%Medium
GS6-30-ORUT 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). Its tank holds 29 gallons, so reheating adds 33 gallons during the first hour. Of 763 gas storage models, 671 give more hot water in the first hour. Among gas storage models, the median first-hour rating is 78 gallons.

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). Its test simulated a day of medium hot water use (its draw pattern). Of 288 gas storage models with the same draw pattern, 185 have a higher UEF. For its type and draw pattern, the median UEF is 0.60. The water took in 79% of the energy used to reheat it (its recovery efficiency).

Its 2 model numbers are GS X 30 ORUT 4** and GS6-30-ORUT 4**. There are 4 more basic models with the same test figures. Each of the 4 other brands lists one of them. 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.