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Lochinvar ENT-40 1**

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

  • Electric storage water heater
  • 2 listed models

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

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

Storage volume
36gallons
UEF
0.92Uniform energy factor
First-hour rating
53gallonsHot water in the first hour
See it among every electric storage model

Advertised and certified figures

Lochinvar ENT-40 1**: advertised and certified
Lochinvar ENT-40 1**: advertised and certified Size: advertised 40 gal, certified 36 gal (advertised nominal size, certified storage volume). Size: advertised 36 gal, certified 36 gal (certified storage volume). UEF: advertised 0.95, certified 0.92. UEF: advertised 0.92, certified 0.92. Size · advertised nominal size, certified storage volume Advertised 40 gal Certified 36 gal Size · certified storage volume Advertised 36 gal Certified 36 gal UEF Advertised 0.95 Certified 0.92 UEF Advertised 0.92 Certified 0.92
FigureAdvertisedCertifiedAdvertiserRead
Size 40 gal, nominal size 36 gal storage volume Lochinvar Read Oct 4, 2026
Size 36 gal 36 gal storage volume Lochinvar Read Oct 4, 2026
UEF 0.95 0.92 Lochinvar Read Oct 4, 2026
UEF 0.92 0.92 Lochinvar Read Oct 4, 2026
First-hour rating 53 gal 53 gal Lochinvar Read Oct 4, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
LET-40 1**360.925398%Medium
LET-40-8 1**360.925398%Medium

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

It holds 36 gallons in the test, 4 gallons less than its 40-gallon sold size. Starting full, it gives 53 gallons of hot water in its first hour of use. That is 17 gallons more than its tank holds, since it reheats during the hour. In the first hour, 265 of the 477 electric storage models give more hot water. Among electric storage models, the median first-hour rating is 55 gallons.

In tests, 92% of the energy it uses ends up as hot water (UEF 0.92). Its test simulated a day of medium hot water use (its draw pattern). Of 297 electric storage models with the same draw pattern, 81 have a higher UEF and 2 a lower one. 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).

It is the basic model for LET-40 1** and LET-40-8 1**. Its test figures match those of 7 other basic models. Each of the 7 other brands lists one of them. For the full group, see the A. O. Smith ENT-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.