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Lochinvar GDV-50 3**

Lochinvar GDV-50 3** is in the DOE listing as of Oct 26, 2026.

  • Gas storage water heater
  • 3 listed models

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

Its figures are also listed under A. O. Smith GDV-50 3**.

Storage volume
48gallons
UEF
0.66Uniform energy factor
First-hour rating
77gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

Lochinvar GDV-50 3**: advertised and certified
Lochinvar GDV-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 0.66, certified 0.66. UEF: advertised 0.66, certified 0.66 (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 0.66 Certified 0.66 UEF · advertised up to Advertised 0.66 Certified 0.66
FigureAdvertisedCertifiedAdvertiserRead
Size 50 gal, nominal size 48 gal storage volume Lochinvar Read Oct 5, 2026
Size 48 gal 48 gal storage volume Lochinvar Read Oct 5, 2026
UEF 0.66 0.66 Lochinvar Read Oct 5, 2026
UEF up to 0.66 0.66 Lochinvar Read Oct 5, 2026
First-hour rating 77 gal 77 gal Lochinvar Read Oct 5, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
GBL05040 3*1480.667779%High
GBL05040ST 3*1480.667779%High
GBN05040 3**480.667779%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 77 gallons of hot water in the test's first hour. That is 29 gallons more than its tank holds, since it reheats during the hour. Of 763 gas storage models, 418 give more hot water in the first hour. Among gas storage models, the median first-hour rating is 78 gallons.

As of Oct 26, 2026, it was not listed as ENERGY STAR certified. In tests, 66% of the energy it uses ends up as hot water (UEF 0.66). Its test simulated a day of high hot water use (its draw pattern). Among 434 gas storage models on its draw pattern, 213 have a higher UEF. On its draw pattern, its UEF is also the median gas storage UEF. The water took in 79% of the energy used to reheat it (its recovery efficiency).

Its 3 model numbers are GBL05040 3*1, GBL05040ST 3*1, and GBN05040 3**. There are 4 more basic models with the same test figures. They are listed under 4 other brands, one each. For the full group, see the A. O. Smith GDV-50 3** 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.