RELIANCE WATER HEATERS ENS-30 1**
0.89 UEF DOE CCD · 2026-09-19Grade G: where this UEF sits among the 163 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
An electric tank, low draw pattern (a one- or two-person household).
If you are checking this water heater's figures, the RELIANCE WATER HEATERS ENS-30 1** uses 2,522 kWh of electricity a year at the low draw pattern, the standard daily hot-water usage DOE tests against. That is 83 kWh above the class median of 2,439 kWh among 163 electric tank models at the same draw pattern.
Energy use per year
2,522 kWh a year
Computed by this site from the registry's UEF and the federal test's daily hot-water draw for this draw pattern. What it costs depends on the electricity rate where you live.
That is above the median of 2,439 kWh for the 163 models registered in the same heater type and draw pattern; it ranks 143 of 163, lowest energy first.
Solid line: this model (2,522 kWh). Dashed line: the class median.
Min 724 kWh Median 2,439 kWh Max 2,550 kWh
What it costs to run where you live
What the registry files
- UEF (Uniform Energy Factor) how much hot water you get for each unit of energy the heater uses
- 0.89 DOE CCD · 2026-09-19 Compared only with other models registered as an electric tank at the low draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- Low DOE CCD · 2026-09-19
- First Hour Rating how many gallons of hot water the unit can deliver in one hour, starting from a full tank
- 47 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 27 gal DOE CCD · 2026-09-19
What it costs to install
Not published: Installed cost range
This model's UEF lies outside the range NLR REMDB's cost model was fitted on, and the range is not stretched past it.
The annual energy figure on this page does not depend on this range and is unaffected.
Safety record
No CPSC recall names this model.
Checked against the CPSC recall database. CPSC does not publish a model-level match for this product category, so this list is curated by hand from the manufacturer's recall filings.
CPSC · 2026-09-24What these figures mean
How this compares
The closest models in the same class — same fuel, type and draw pattern.
Keep going
How every figure on this page is calculated
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Find what replaces your water heater
Enter the model number off your old unit and see what is on file today, with the yearly cost difference.
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Find a water heater that fits
Three questions — fuel, hot water need, install space — narrow every model on file to the ones that fit.
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What a water heater costs to run
Prices a unit's efficiency against your own utility's filed tariff for your ZIP code.
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Is a 30-gallon water heater enough?
Answered from what models in this size actually file.
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Water heaters
Every model on file with the Department of Energy, by heater type.
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All electric resistance tank water heaters
Electric tanks that file a UEF below 2.0 — heated by elements, not a heat pump.
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Every RELIANCE WATER HEATERS model on file
What this brand files, by heater type.
UEF 0.89 · Grade G Price it on your ZIP
The figure of 2,522 kWh was computed by this site, not by the registry. The registry's UEF, the ratio of hot water delivered to energy used, is 0.89. This site combines it with the daily hot-water draw that the DOE test assigns to the low draw pattern, which represents a one- or two-person household. The figure therefore holds only at that test draw and only for electricity. A household that uses more or less hot water than the test draw will see a different total. The source is the DOE CCD, retrieved 2026-09-19. The method behind the annual figures is described on its own page.
Against the 163 electric tank models registered at the low draw pattern, this model ranks 143rd lowest for energy use among 163. That places it in the highest quarter of its class for energy use, 83 kWh above the class median of 2,439 kWh. The rated volume is 27 gallons. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 47 gallons. Households near the low draw pattern are the case these figures describe. Households with heavier peak demand can compare their own use with the first hour rating, because the annual energy figure does not cover other draw patterns.
The running cost is not written here because it depends on your own utility electricity tariff. The cost calculator on your own ZIP applies your rate to the 2,522 kWh figure, which is valid at the low draw pattern only. The installed price range is not published for this model. Its ratings lie outside the range the cost database's model was fitted on, and the range is not stretched past it. To compare with a unit of the same class, find a same-class replacement by model number and check its annual energy against the class median of 2,439 kWh. Other draw patterns and fuels are not shown on this page.
DOE CCD · 2026-09-19