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A. O. Smith GCBL-30R 4**

A. O. Smith GCBL-30R 4** is in the DOE listing as of Oct 26, 2026.

It has a labeled size of 30 gallons, a certified storage volume of 29 gallons, a certified UEF of 0.60, and a certified first-hour rating of 65 gallons of hot water.

Its advertised UEF of 0.60 from A. O. Smith matches the certified 0.60 (Read Oct 4, 2026).

  • Gas storage water heater
  • 2 listed models

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

Storage volume
29gallons
UEF
0.60Uniform energy factor
First-hour rating
65gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

A. O. Smith GCBL-30R 4**: advertised and certified
A. O. Smith GCBL-30R 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 0.60, certified 0.60. UEF: advertised 0.60, certified 0.60 (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 0.60 Certified 0.60 UEF · advertised up to Advertised 0.60 Certified 0.60
FigureAdvertisedCertifiedAdvertiserRead
Size 30 gal, nominal size 29 gal storage volume A. O. Smith Read Oct 4, 2026
Size 29 gal 29 gal storage volume A. O. Smith Read Oct 4, 2026
UEF 0.60 0.60 A. O. Smith Read Oct 4, 2026
UEF up to 0.60 0.60 A. O. Smith Read Oct 4, 2026
First-hour rating 65 gal 65 gal A. O. Smith Read Oct 4, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
GCBL-30R 4**290.606575%Medium
GCBL-30R 4*1290.606575%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 65 gallons in the test (its first-hour rating). That is 36 gallons more than its tank holds, since it reheats during the hour. Among 763 gas storage models, 600 have a higher first-hour rating. Among gas storage models, the median first-hour rating is 78 gallons.

On Oct 26, 2026, this heater was not listed as ENERGY STAR certified. In tests, 60% of the energy it uses ends up as hot water (UEF 0.60). Its test simulated a day of medium hot water use (its draw pattern). Its UEF is lower than that of 88 of the 288 gas storage models with its draw pattern. On its draw pattern, its UEF is also the median gas storage UEF. The water took in 75% of the energy used to reheat it (its recovery efficiency).

It is the basic model for GCBL-30R 4** and GCBL-30R 4*1. There are 4 more basic models with the same test figures. They are listed under 4 other brands, one each.

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.