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Lochinvar GUR 40 4**

Lochinvar GUR 40 4** is in the DOE listing as of Oct 26, 2026.

  • Gas storage water heater
  • 2 listed models

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

Its figures are also listed under A. O. Smith G9-UT4040NVR 5**.

Storage volume
38gallons
UEF
0.64Uniform energy factor
First-hour rating
83gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

Lochinvar GUR 40 4**: advertised and certified
Lochinvar GUR 40 4**: 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 0.64, certified 0.64. UEF: advertised 0.64, certified 0.64 (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 0.64 Certified 0.64 UEF · advertised up to Advertised 0.64 Certified 0.64
FigureAdvertisedCertifiedAdvertiserRead
Size 40 gal, nominal size 38 gal storage volume Lochinvar Read Oct 5, 2026
Size 38 gal 38 gal storage volume Lochinvar Read Oct 5, 2026
UEF 0.64 0.64 Lochinvar Read Oct 5, 2026
UEF up to 0.64 0.64 Lochinvar Read Oct 5, 2026
First-hour rating 83 gal 83 gal Lochinvar Read Oct 5, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
UTN040 40-8R(T) 4**380.648377%High
UTN040 40R 4**380.648377%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. Starting full, it gives 83 gallons of hot water in its first hour of use. That is 45 gallons more than its tank holds, since it reheats during the hour. Of 763 gas storage models, 242 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, 64% of the energy it uses ends up as hot water (UEF 0.64). In the test, daily hot water use was set to high (its draw pattern). Among 434 gas storage models on its draw pattern, 255 have a higher UEF. For its type and draw pattern, the UEF runs from 0.61 to 0.90. When it reheats water in the test, 77% of the energy it uses ends up in the water.

It is sold as UTN040 40-8R(T) 4** and UTN040 40R 4**. All of its test figures are shared by 9 other basic models. Between them, those basic models carry 4 other brand names. For the full group, see the A. O. Smith G9-UT4040NVR 5** page.

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.