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State PESX-40 1**

State PESX-40 1** is in the DOE listing as of Oct 19, 2026.

  • Electric storage water heater
  • 1 listed model

ENERGY STAR certification does not cover this type of water heater.

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

Storage volume
37gallons
UEF
0.92Uniform energy factor
First-hour rating
66gallonsHot water in the first hour
See it among every electric storage model

Advertised and certified figures

State PESX-40 1**: advertised and certified
State PESX-40 1**: advertised and certified Size: advertised 40 gal, certified 37 gal (advertised nominal size, certified storage volume). Size: advertised 37 gal, certified 37 gal (certified storage volume). UEF: advertised 0.92, certified 0.92. First-hour rating: advertised 66 gal, certified 66 gal. Size · advertised nominal size, certified storage volume Advertised 40 gal Certified 37 gal Size · certified storage volume Advertised 37 gal Certified 37 gal UEF Advertised 0.92 Certified 0.92 First-hour rating Advertised 66 gal Certified 66 gal
FigureAdvertisedCertifiedAdvertiserRead
Size 40 gal, nominal size 37 gal storage volume State Read Oct 5, 2026
Size 37 gal 37 gal storage volume State Read Oct 5, 2026
UEF 0.92 0.92 State Read Oct 5, 2026
First-hour rating 66 gal 66 gal State Read Oct 5, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
EEX-40-DXRS 1**370.926698%Medium

UEF is the uniform energy factor. A dash means the model has no such figure.

It holds 37 gallons in the test, 3 gallons less than its 40-gallon sold size. Starting full, it gives 66 gallons of hot water in its first hour of use. That is 29 gallons more than its tank holds, since it reheats during the hour. Among 477 electric storage models, 59 have a higher first-hour rating. The median electric storage model gives 55 gallons in its first hour.

In tests, 92% of the energy went to hot water, so its UEF is 0.92. In the test, daily hot water use was set to medium (its draw pattern). Of 297 electric storage models with the same draw pattern, 81 have a higher UEF. Its UEF is the median for its type and draw pattern. Of the energy spent to reheat water, 98% goes into it (its recovery efficiency).

All of its test figures are shared by 3 other basic models. The A. O. Smith, American, and RELIANCE WATER HEATERS brands list one or more of them. For the full group, see the A. O. Smith PESX-40 1** page.

Also listed as

They carry every figure in the table above.

Updated Oct 19, 2026 · Methodology

Not covered

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