Hot Water List
Menu

A. O. Smith GUR 40 4**

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

  • Gas storage water heater
  • 6 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

A. O. Smith GUR 40 4**: advertised and certified
A. O. Smith 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 A. O. Smith Read Oct 5, 2026
Size 38 gal 38 gal storage volume A. O. Smith Read Oct 5, 2026
UEF 0.64 0.64 A. O. Smith Read Oct 5, 2026
UEF up to 0.64 0.64 A. O. Smith Read Oct 5, 2026
First-hour rating 83 gal 83 gal A. O. Smith Read Oct 5, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
G12-UT4040NVR 4**380.648377%High
G6-UT4040NL 4**380.648377%High
G9-UT4040NVR 4**380.648377%High
GUR 40 4**380.648377%High
HUR 40 4**380.648377%High
XUR 40 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. Its tank holds 38 gallons, so reheating adds 45 gallons during the first hour. Among 763 gas storage models, 242 have a higher first-hour rating. Among gas storage models, the median first-hour rating is 78 gallons.

On Oct 26, 2026, this heater was not listed as ENERGY STAR certified. In tests, 64% of the energy went to hot water, so its UEF is 0.64. In the test, daily hot water use was set to high (its draw pattern). Of 434 gas storage models with the same draw pattern, 255 have a higher UEF and 95 a lower one. For its type and draw pattern, the UEF runs from 0.61 to 0.90. The water took in 77% of the energy used to reheat it (its recovery efficiency).

All 6 of its model numbers carry the same certified figures. All of its test figures are shared by 9 other basic models. Besides this brand, 4 brands list one or more of them. For the full group, see the A. O. Smith G9-UT4040NVR 5**.

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.