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RELIANCE WATER HEATERS GCG-50 4**

RELIANCE WATER HEATERS GCG-50 4** is in the DOE listing as of Oct 26, 2026.

  • Gas storage water heater
  • 5 listed models

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

Its figures are also listed under A. O. Smith GCG-50 4**.

Storage volume
48gallons
UEF
0.62Uniform energy factor
First-hour rating
81gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

RELIANCE WATER HEATERS GCG-50 4**: advertised and certified
RELIANCE WATER HEATERS GCG-50 4**: advertised and certified Size: advertised 50 gal, certified 48 gal (advertised nominal size, certified storage volume). Size: advertised 48 gal, certified 48 gal (certified storage volume). UEF: advertised 0.62, certified 0.62. First-hour rating: advertised 81 gal, certified 81 gal. Size · advertised nominal size, certified storage volume Advertised 50 gal Certified 48 gal Size · certified storage volume Advertised 48 gal Certified 48 gal UEF Advertised 0.62 Certified 0.62 First-hour rating Advertised 81 gal Certified 81 gal
FigureAdvertisedCertifiedAdvertiserRead
Size 50 gal, nominal size 48 gal storage volume RELIANCE WATER HEATERS Read Oct 4, 2026
Size 48 gal 48 gal storage volume RELIANCE WATER HEATERS Read Oct 4, 2026
UEF 0.62 0.62 RELIANCE WATER HEATERS Read Oct 4, 2026
First-hour rating 81 gal 81 gal RELIANCE WATER HEATERS Read Oct 4, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
6-50-NBRT 4**480.628179%High
6-50-PBRT 4*1480.628179%High
9-50-NBRT 4**480.628179%High
9-50-NKRT 4**480.628179%High
9-50-PKRT 4*1480.628179%High

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

It holds 48 gallons in the test, 2 gallons less than its 50-gallon sold size. It delivers 81 gallons of hot water in the test's first hour. That is 33 gallons more than its tank holds, since it reheats during the hour. In the first hour, 295 of the 763 gas storage models give more hot water. 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, 62% of the energy it uses ends up as hot water (UEF 0.62). Its test ran at the high level of daily hot water use. Of 434 gas storage models with the same draw pattern, 386 have a higher UEF and 15 a lower one. For its type and draw pattern, the median UEF is 0.66. When it reheats water in the test, 79% of the energy it uses ends up in the water.

All 5 of its model numbers carry the same certified figures. Its test figures match those of 5 other basic models. Each of them is listed under a different brand. You can find the whole group on the page for the A. O. Smith GCG-50 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.