Hot Water List
Menu

A. O. Smith GUR-50 4**

A. O. Smith GUR-50 4** is in the DOE listing as of Oct 26, 2026.

It has a labeled size of 50 gallons, a certified storage volume of 48 gallons, a certified UEF of 0.64, and a certified first-hour rating of 84 gallons of hot water.

Its advertised UEF of 0.64 from A. O. Smith matches the certified 0.64 (Read Oct 5, 2026).

  • Gas storage water heater
  • 5 listed models

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

Storage volume
48gallons
UEF
0.64Uniform energy factor
First-hour rating
84gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

A. O. Smith GUR-50 4**: advertised and certified
A. O. Smith GUR-50 4**: advertised and certified Size: advertised 50 gal, certified 48 gal (advertised nominal size, certified storage volume). Size: advertised 48 gal, certified 48 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 50 gal Certified 48 gal Size · certified storage volume Advertised 48 gal Certified 48 gal UEF Advertised 0.64 Certified 0.64 UEF · advertised up to Advertised 0.64 Certified 0.64
FigureAdvertisedCertifiedAdvertiserRead
Size 50 gal, nominal size 48 gal storage volume A. O. Smith Read Oct 5, 2026
Size 48 gal 48 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 84 gal 84 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-UT5040NVR 4**480.648477%High
G9-UT5040NVR 4**480.648477%High
GUR-50 4**480.648477%High
HUR-50 4**480.648477%High
XUR 50 4**480.648477%High

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

It holds 48 gallons in the test, 2 gallons less than its 50-gallon sold size. Starting full, it gives 84 gallons of hot water in its first hour of use. Reheating lets it give 36 gallons beyond the 48 gallons in its tank. In the first hour, 209 of the 763 gas storage models give more hot water. Among gas storage models, the median first-hour rating is 78 gallons.

It was not listed as ENERGY STAR certified on Oct 26, 2026. 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). Its UEF is lower than that of 255 of the 434 gas storage models with its draw pattern. For its type and draw pattern, the median UEF is 0.66. When it reheats water in the test, 77% of the energy it uses ends up in the water.

It is sold under 5 model numbers in all. Its test figures match those of 4 other basic models. They are listed under 4 other brands, one each.

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.