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A. O. Smith GPVNT-40 1**

A. O. Smith GPVNT-40 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 0.73, and a certified first-hour rating of 91 gallons of hot water.

Its advertised UEF of 0.73 from A. O. Smith matches the certified 0.73 (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
0.73Uniform energy factor
First-hour rating
91gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

A. O. Smith GPVNT-40 1**: advertised and certified
A. O. Smith GPVNT-40 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 0.73, certified 0.73. UEF: advertised 0.73, certified 0.73 (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 0.73 Certified 0.73 UEF · advertised up to Advertised 0.73 Certified 0.73
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 0.73 0.73 A. O. Smith Read Oct 5, 2026
UEF up to 0.73 0.73 A. O. Smith Read Oct 5, 2026
UEF 0.72 0.73 A. O. Smith Read Oct 5, 2026
First-hour rating 91 gal 91 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-UPT4042NV 1**380.739178%High
GPVNT-40 1**380.739178%High

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 91 gallons in the test (its first-hour rating). Reheating lets it give 53 gallons beyond the 38 gallons in its tank. In the first hour, 120 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, 73% of the energy it uses ends up as hot water (UEF 0.73). Its test simulated a day of high hot water use (its draw pattern). Of 434 gas storage models with the same draw pattern, 54 have a higher UEF. On its draw pattern, the median gas storage UEF is 0.66. Of the energy spent to reheat water, 78% goes into it (its recovery efficiency).

It is the basic model for G6-UPT4042NV 1** and GPVNT-40 1**. Its test figures match those of 4 other basic models. Each of the 4 other brands lists one of them.

It may qualify for 2 rebate programs.

Also listed as

They carry every figure in the table above.

Rebates

ProgramStateStatusProgram page
Xcel Energy MINNESOTA RESIDENTIAL ENERGY EFFICIENCY PROGRAMS (gas storage, gas tankless) MN May qualify Its own page
Avista Home and small commercial: HVAC and water heating incentives (gas storage) WA May qualify Its own page

Programs change their terms. Check the program's own page before you buy.

Updated Oct 26, 2026 · Methodology

Not covered

  • Changes to an advertised figure after the date beside it.