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Lochinvar GCBL-40 4**

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

  • Gas storage water heater
  • 4 listed models

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

Its figures are also listed under A. O. Smith GCBL-40 4**.

Storage volume
38gallons
UEF
0.57Uniform energy factor
First-hour rating
68gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

Lochinvar GCBL-40 4**: advertised and certified
Lochinvar GCBL-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 0.57, certified 0.57. UEF: advertised 0.57, certified 0.57 (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 0.57 Certified 0.57 UEF · advertised up to Advertised 0.57 Certified 0.57
FigureAdvertisedCertifiedAdvertiserRead
Size 40 gal, nominal size 38 gal storage volume Lochinvar Read Oct 4, 2026
Size 38 gal 38 gal storage volume Lochinvar Read Oct 4, 2026
UEF 0.57 0.57 Lochinvar Read Oct 4, 2026
UEF up to 0.57 0.57 Lochinvar Read Oct 4, 2026
First-hour rating 78 gal 68 gal Lochinvar Read Oct 4, 2026
First-hour rating 68 gal 68 gal Lochinvar Read Oct 4, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
GSL04040B 4*1380.576875%Medium
GSN04040B 4**380.576875%Medium
GSN04040BT 4**380.576875%Medium
GSN04040BTM 4**380.576875%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. Over one hour from a full tank, it gave 68 gallons in the test (its first-hour rating). Its tank holds 38 gallons, so reheating adds 30 gallons during the first hour. Among 763 gas storage models, 529 have a higher first-hour rating. Among gas storage models, the median first-hour rating is 78 gallons.

As of Oct 26, 2026, it was not listed as ENERGY STAR certified. In tests, 57% of the energy went to hot water, so its UEF is 0.57. In the test, daily hot water use was set to medium (its draw pattern). Its UEF is lower than that of 277 of the 288 gas storage models with its draw pattern. A UEF of 0.60 is the median for its type and draw pattern. Of the energy spent to reheat water, 75% goes into it (its recovery efficiency).

It is sold under 4 model numbers in all. Its test figures match those of 5 other basic models. They are listed under 5 other brands, one each. You can find the whole group on the page for the A. O. Smith GCBL-40 4**.

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.