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RELIANCE WATER HEATERS GCBL-40 4**

RELIANCE WATER HEATERS 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

RELIANCE WATER HEATERS GCBL-40 4**: advertised and certified
RELIANCE WATER HEATERS 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. First-hour rating: advertised 68 gal, certified 68 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 0.57 Certified 0.57 First-hour rating Advertised 68 gal Certified 68 gal
FigureAdvertisedCertifiedAdvertiserRead
Size 40 gal, nominal size 38 gal storage volume RELIANCE WATER HEATERS Read Oct 4, 2026
Size 38 gal 38 gal storage volume RELIANCE WATER HEATERS Read Oct 4, 2026
UEF 0.57 0.57 RELIANCE WATER HEATERS Read Oct 4, 2026
First-hour rating 68 gal 68 gal RELIANCE WATER HEATERS Read Oct 4, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
6-40-NBRBS 4**380.576875%Medium
6-40-PBRBS 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. Over one hour from a full tank, it gave 68 gallons in the test (its first-hour rating). Its tank holds 38 gallons, so reheating adds 30 gallons during the first hour. In the first hour, 529 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 the test, 43% of its energy does not reach the hot water (UEF 0.57). Its test ran at the medium level of daily hot water use. Its UEF is lower than that of 277 of the 288 gas storage models with its draw pattern. On its draw pattern, the median gas storage UEF is 0.60. When it reheats water in the test, 75% of the energy it uses ends up in the water.

Its 2 model numbers are 6-40-NBRBS 4** and 6-40-PBRBS 4*1. There are 5 more basic models with the same test figures. They are listed under 5 other brands, one each. For the full group, see the A. O. Smith GCBL-40 4** page.

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.