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A. O. Smith GDVT-50 3**

A. O. Smith GDVT-50 3** is in the DOE listing as of Oct 26, 2026.

It has a labeled size of 50 gallons, a certified storage volume of 48 gallons, a certified UEF of 0.65, and a certified first-hour rating of 82 gallons of hot water.

Its advertised UEF of 0.65 from A. O. Smith matches the certified 0.65 (Read Oct 5, 2026).

  • Gas storage water heater
  • 4 listed models

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

Storage volume
48gallons
UEF
0.65Uniform energy factor
First-hour rating
82gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

A. O. Smith GDVT-50 3**: advertised and certified
A. O. Smith GDVT-50 3**: 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 0.65, certified 0.65. UEF: advertised 0.65, certified 0.65 (advertised up to). 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 0.65 Certified 0.65 UEF · advertised up to Advertised 0.65 Certified 0.65
FigureAdvertisedCertifiedAdvertiserRead
Size 50 gal, nominal size 48 gal storage volume A. O. Smith Read Oct 5, 2026
Size 48 gal 48 gal storage volume A. O. Smith Read Oct 5, 2026
UEF 0.65 0.65 A. O. Smith Read Oct 5, 2026
UEF up to 0.65 0.65 A. O. Smith Read Oct 5, 2026
First-hour rating 83 gal 82 gal A. O. Smith Read Oct 5, 2026
First-hour rating 82 gal 82 gal A. O. Smith Read Oct 5, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
GDVT-50 3**480.658279%High
GDVT-50 3*1480.658279%High
GDVT-50L 3**480.658279%High
GDVT-50L 3*1480.658279%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. Starting full, it gives 82 gallons of hot water in its first hour of use. That is 34 gallons more than its tank holds, since it reheats during the hour. Of 763 gas storage models, 280 give more hot water in the first hour. The median gas storage model gives 78 gallons in the first hour of the test.

On Oct 26, 2026, this heater was not listed as ENERGY STAR certified. In the test, 35% of its energy does not reach the hot water (UEF 0.65). In the test, daily hot water use was set to high (its draw pattern). Of 434 gas storage models with the same draw pattern, 225 have a higher UEF and 179 a lower one. A UEF of 0.66 is the median for its type and draw pattern. The water took in 79% of the energy used to reheat it (its recovery efficiency).

All 4 of its model numbers carry the same certified figures. Its test figures match those of 3 other basic models. Of those, one or more are under the American, Lochinvar, and State brands.

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.