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State GCBL-40 4**

State GCBL-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 GCBL-40 4**.

Storage volume
38gallons
UEF
0.57Uniform energy factor
First-hour rating
68gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

State GCBL-40 4**: advertised and certified
State GCBL-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 0.57, certified 0.57. UEF: advertised 0.57, certified 0.57 (advertised up to). 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 0.57 Certified 0.57 UEF · advertised up to Advertised 0.57 Certified 0.57
FigureAdvertisedCertifiedAdvertiserRead
Size 40 gal, nominal size 38 gal storage volume State Read Oct 4, 2026
Size 38 gal 38 gal storage volume State Read Oct 4, 2026
UEF 0.57 0.57 State Read Oct 4, 2026
UEF up to 0.57 0.57 State Read Oct 4, 2026
First-hour rating 68 gal 68 gal State Read Oct 4, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
GS6-40-BRBS 4**380.576875%Medium
GS6-40-BRBS 4*1380.576875%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. That is 30 gallons more than its tank holds, since it reheats during the hour. Among 763 gas storage models, 529 have a higher first-hour rating. The median gas storage model gives 78 gallons in its first hour.

On Oct 26, 2026, this heater was not listed as ENERGY STAR certified. In the test, 43% of its energy does not reach the hot water (UEF 0.57). The daily hot water use in the test, called its draw pattern, was medium. Among 288 gas storage models on its draw pattern, 277 have a higher UEF. For its type and draw pattern, the median UEF is 0.60. When it reheats water in the test, 75% of the energy it uses ends up in the water.

It is the basic model for GS6-40-BRBS 4** and GS6-40-BRBS 4*1. Its test figures match those of 5 other basic models. Each of the 5 other brands lists one of them. You can find the whole group on the page for the A. O. Smith GCBL-40 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.