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State GPDNL-40 1**

State GPDNL-40 1** is in the DOE listing as of Oct 26, 2026.

  • Gas storage water heater
  • 1 listed model

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

Its figures are also listed under A. O. Smith GPDNL-40 1**.

Storage volume
38gallons
UEF
0.70Uniform energy factor
First-hour rating
75gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

State GPDNL-40 1**: advertised and certified
State GPDNL-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 0.70, certified 0.70. UEF: advertised 0.70, certified 0.70 (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 0.70 Certified 0.70 UEF · advertised up to Advertised 0.70 Certified 0.70
FigureAdvertisedCertifiedAdvertiserRead
Size 40 gal, nominal size 38 gal storage volume State Read Oct 5, 2026
Size 38 gal 38 gal storage volume State Read Oct 5, 2026
UEF 0.70 0.70 State Read Oct 5, 2026
UEF up to 0.70 0.70 State Read Oct 5, 2026
First-hour rating 75 gal 75 gal State Read Oct 5, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
GS6-40-UBPDS 1**380.707577%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. It delivers 75 gallons of hot water in the test's first hour. That is 37 gallons more than its tank holds, since it reheats during the hour. Of 763 gas storage models, 443 give more hot water in the first hour. The median gas storage model gives 78 gallons in its first hour.

As of Oct 26, 2026, it was not listed as ENERGY STAR certified. In the test, 30% of its energy does not reach the hot water (UEF 0.70). In the test, daily hot water use was set to high (its draw pattern). Of 434 gas storage models with the same draw pattern, 111 have a higher UEF and 283 a lower one. On its draw pattern, the median gas storage UEF is 0.66. The water took in 77% of the energy used to reheat it (its recovery efficiency).

Its test figures match those of 3 other basic models. Of those, one or more are under the A. O. Smith, American, and Lochinvar brands. For the full group, see the A. O. Smith GPDNL-40 1**.

In 2 states, 2 rebate programs may accept it.

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.