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Lennox WHGS040T40NANE****

Lennox WHGS040T40NANE**** 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 AMERICAN STANDARD WATER HEATERS GN40T2-3-*.

Storage volume
38gallons
UEF
0.60Uniform energy factor
First-hour rating
73gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

Lennox WHGS040T40NANE****: advertised and certified
Lennox WHGS040T40NANE****: advertised and certified Size: advertised 40 gal, certified 38 gal (advertised nominal size, certified storage volume). UEF: advertised 0.60, certified 0.60. First-hour rating: advertised 73 gal, certified 73 gal. Size · advertised nominal size, certified storage volume Advertised 40 gal Certified 38 gal UEF Advertised 0.60 Certified 0.60 First-hour rating Advertised 73 gal Certified 73 gal
FigureAdvertisedCertifiedAdvertiserRead
Size 40 gal, nominal size 38 gal storage volume Lennox Read Oct 5, 2026
UEF 0.60 0.60 Lennox Read Oct 5, 2026
First-hour rating 73 gal 73 gal Lennox Read Oct 5, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
WHGS040T40NANE****380.607376%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. Starting full, it gives 73 gallons of hot water in its first hour of use. Reheating lets it give 35 gallons beyond the 38 gallons in its tank. Of 763 gas storage models, 477 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 tests, 60% of the energy it uses ends up as hot water (UEF 0.60). In the test, daily hot water use was set to medium (its draw pattern). Among 288 gas storage models on its draw pattern, 88 have a higher UEF. Its UEF is the median for its type and draw pattern. Of the energy spent to reheat water, 76% goes into it (its recovery efficiency).

There are 2 more basic models with the same test figures. The AMERICAN STANDARD WATER HEATERS and Ariston brands list one or more of them. You can find the whole group on the page for the AMERICAN STANDARD WATER HEATERS GN40T2-3-*.

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.