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A. O. Smith GDVNL-40L 1**

A. O. Smith GDVNL-40L 1** is in the DOE listing as of Oct 26, 2026.

It has a labeled size of 40 gallons, a certified storage volume of 38 gallons, a certified UEF of 0.61, and a certified first-hour rating of 64 gallons of hot water.

Its advertised UEF of 0.61 from A. O. Smith matches the certified 0.61 (Read Oct 5, 2026).

  • Gas storage water heater
  • 2 listed models

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

Storage volume
38gallons
UEF
0.61Uniform energy factor
First-hour rating
64gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

A. O. Smith GDVNL-40L 1**: advertised and certified
A. O. Smith GDVNL-40L 1**: 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 0.61, certified 0.61. UEF: advertised 0.61, certified 0.61 (advertised up to). 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 0.61 Certified 0.61 UEF · advertised up to Advertised 0.61 Certified 0.61
FigureAdvertisedCertifiedAdvertiserRead
Size 40 gal, nominal size 38 gal storage volume A. O. Smith Read Oct 5, 2026
Size 38 gal 38 gal storage volume A. O. Smith Read Oct 5, 2026
UEF 0.61 0.61 A. O. Smith Read Oct 5, 2026
UEF up to 0.61 0.61 A. O. Smith Read Oct 5, 2026
First-hour rating 64 gal 64 gal A. O. Smith Read Oct 5, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
G6-UDS4036NV 1**380.616474%Medium
GDVNL-40L 1**380.616474%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 64 gallons in the test (its first-hour rating). Its tank holds 38 gallons, so reheating adds 26 gallons during the first hour. Of 763 gas storage models, 629 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 tests, 61% of the energy it uses ends up as hot water (UEF 0.61). Its test ran at the medium level of daily hot water use. Its UEF is lower than that of 72 of the 288 gas storage models with its draw pattern. A UEF of 0.60 is the median for its type and draw pattern. When it reheats water in the test, 74% of the energy it uses ends up in the water.

Its 2 model numbers are G6-UDS4036NV 1** and GDVNL-40L 1**. There are 3 more basic models with the same test figures. The American, RELIANCE WATER HEATERS, and State brands list one or more of them.

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.