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RELIANCE WATER HEATERS ENS-30 1**

RELIANCE WATER HEATERS ENS-30 1** is in the DOE listing as of Oct 19, 2026.

  • Electric storage water heater
  • 1 listed model

ENERGY STAR certification does not cover this type of water heater.

Its figures are also listed under A. O. Smith ENS-30 1**.

Storage volume
27gallons
UEF
0.89Uniform energy factor
First-hour rating
47gallonsHot water in the first hour
See it among every electric storage model

Advertised and certified figures

RELIANCE WATER HEATERS ENS-30 1**: advertised and certified
RELIANCE WATER HEATERS ENS-30 1**: advertised and certified Size: advertised 30 gal, certified 27 gal (advertised nominal size, certified storage volume). Size: advertised 27 gal, certified 27 gal (certified storage volume). UEF: advertised 0.89, certified 0.89. First-hour rating: advertised 47 gal, certified 47 gal. Size · advertised nominal size, certified storage volume Advertised 30 gal Certified 27 gal Size · certified storage volume Advertised 27 gal Certified 27 gal UEF Advertised 0.89 Certified 0.89 First-hour rating Advertised 47 gal Certified 47 gal
FigureAdvertisedCertifiedAdvertiserRead
Size 30 gal, nominal size 27 gal storage volume RELIANCE WATER HEATERS Read Oct 4, 2026
Size 27 gal 27 gal storage volume RELIANCE WATER HEATERS Read Oct 4, 2026
UEF 0.89 0.89 RELIANCE WATER HEATERS Read Oct 4, 2026
First-hour rating 47 gal 47 gal RELIANCE WATER HEATERS Read Oct 4, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
6-30-EORS 1**270.894798%Low

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

It holds 27 gallons in the test, 3 gallons less than its 30-gallon sold size. Starting full, it gives 47 gallons of hot water in its first hour of use. That is 20 gallons more than its tank holds, since it reheats during the hour. In the first hour, 350 of the 477 electric storage models give more hot water. The median electric storage model gives 55 gallons in the first hour of the test.

In tests, 89% of the energy it uses ends up as hot water (UEF 0.89). Its test ran at the low level of daily hot water use. Of 157 electric storage models with the same draw pattern, 136 have a higher UEF. A UEF of 0.92 is the median for its type and draw pattern. Of the energy spent to reheat water, 98% goes into it (its recovery efficiency).

There are 4 more basic models with the same test figures. Each of the 4 other brands lists one of them. For the full group, see the A. O. Smith ENS-30 1** page.

Also listed as

They carry every figure in the table above.

Updated Oct 19, 2026 · Methodology

Not covered

  • Changes to an advertised figure after the date beside it.