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Lochinvar GUC-30 4**

Lochinvar GUC-30 4** is in the DOE listing as of Oct 26, 2026.

  • Gas storage water heater
  • 1 listed model

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

Its figures are also listed under A. O. Smith GUC-30 4**.

Storage volume
29gallons
UEF
0.59Uniform energy factor
First-hour rating
62gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

Lochinvar GUC-30 4**: advertised and certified
Lochinvar GUC-30 4**: advertised and certified Size: advertised 30 gal, certified 29 gal (advertised nominal size, certified storage volume). Size: advertised 29 gal, certified 29 gal (certified storage volume). UEF: advertised 0.59, certified 0.59. UEF: advertised 0.59, certified 0.59 (advertised up to). Size · advertised nominal size, certified storage volume Advertised 30 gal Certified 29 gal Size · certified storage volume Advertised 29 gal Certified 29 gal UEF Advertised 0.59 Certified 0.59 UEF · advertised up to Advertised 0.59 Certified 0.59
FigureAdvertisedCertifiedAdvertiserRead
Size 30 gal, nominal size 29 gal storage volume Lochinvar Read Oct 5, 2026
Size 29 gal 29 gal storage volume Lochinvar Read Oct 5, 2026
UEF 0.59 0.59 Lochinvar Read Oct 5, 2026
UEF up to 0.59 0.59 Lochinvar Read Oct 5, 2026
First-hour rating 62 gal 62 gal Lochinvar Read Oct 5, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
UTN03030R 4**290.596279%Medium

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

It holds 29 gallons in the test, 1 gallon less than its 30-gallon sold size. Starting full, it gives 62 gallons of hot water in its first hour of use. Its tank holds 29 gallons, so reheating adds 33 gallons during the first hour. Among 763 gas storage models, 671 have a higher first-hour rating. The median gas storage model gives 78 gallons in its first hour.

It was not listed as ENERGY STAR certified on Oct 26, 2026. In tests, 59% of the energy it uses ends up as hot water (UEF 0.59). Its test simulated a day of medium hot water use (its draw pattern). Of 288 gas storage models with the same draw pattern, 185 have a higher UEF. On its draw pattern, the median gas storage UEF is 0.60. Of the energy spent to reheat water, 79% goes into it (its recovery efficiency).

Its test figures match those of 4 other basic models. Each of them is listed under a different brand. You can find the whole group on the page for the A. O. Smith GUC-30 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.