RELIANCE WATER HEATERS ENSB-30 1**
0.91 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 model's rating: the RELIANCE WATER HEATERS ENSB-30 1**, an electric tank, uses 2,466 kWh of electricity a year. That figure belongs to the low draw pattern, the standard daily hot-water usage DOE tests against. It is 27 kWh above the 2,439 kWh class median, ranking 88th lowest energy use of 163.
Energy use per year
2,466 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 88 of 163, lowest energy first.
Solid line: this model (2,466 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
- 0.91 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
- 50 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 0.91 · Grade G Price it on your ZIP
The 2,466 kWh figure is computed by this site, not taken from the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the low draw pattern. This model's UEF is 0.91. The source is the DOE CCD, retrieved 2026-09-19. The figure holds only at the federal test's daily draw. A household that draws more or less hot water than the test will use a different amount. That amount is not available here. Against the 2,439 kWh median of its class, this model uses 27 kWh more a year.
In the DOE test, the low draw pattern corresponds to a one- or two-person household. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 50 gallons. Its rated volume is 27 gallons. For a household whose usage matches the test, the 2,466 kWh figure applies as stated. The data here covers only the low draw pattern. This model's energy use at a heavier daily draw is not available. A household that regularly needs more than 50 gallons in its first hour falls outside what this rating describes. To compare other units, use the water heater selector by fuel, space and size. To find another of the 163 models in this class, use the same-class replacement lookup by model number.
The running cost is not stated in this text, because it depends on your own utility's electricity tariff. The page applies your rate to the 2,466 kWh figure, using your ZIP. The cost calculator on your own ZIP shows that result. The method behind the annual cost explains each step. At any rate you pay, the 27 kWh gap to the class median also shows up in the cost. An installed price range is not published for this model. Its ratings, including the UEF of 0.91 and the 27-gallon rated volume, lie outside the range the cost database's model was fitted on. The range is not stretched past that fit, so no installed price is available here.
DOE CCD · 2026-09-19