RELIANCE WATER HEATERS ENJB-30 1**
0.9 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).
This RELIANCE WATER HEATERS ENJB-30 1** electric tank uses 2,494 kWh a year at the low draw pattern, the standard daily hot-water usage DOE tests against. That test draw represents a one- or two-person household. The figure is 55 kWh above the class median of 2,439 kWh.
Energy use per year
2,494 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 122 of 163, lowest energy first.
Solid line: this model (2,494 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
- 0.9 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
- 26 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
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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 0.9 · Grade G Price it on your ZIP
The registry lists this model's UEF, the ratio of hot water delivered to energy used, as 0.9. This site, not the registry, computed 2,494 kWh from that UEF and the DOE test's daily hot-water draw for the low draw pattern. The figure comes from DOE CCD, retrieved 2026-09-19. The class comparison covers the 163 models registered as an electric tank at the low draw pattern. This model has the 122nd lowest energy use of 163. That places it in the second-highest quarter of its class for energy use. The gap of 55 kWh above the median of 2,439 kWh holds only at this test draw.
The first hour rating, the gallons of hot water available in the first hour from a full tank, is 47 gallons. The rated volume is 26 gallons. These ratings suit the low draw pattern, which describes a one- or two-person household. A household drawing more than the federal test's daily draw would use more than 2,494 kWh. The data do not say how much more. A household with a higher draw pattern is outside what this figure describes. The figure is a calculation from test values, not a measurement in a real home. To compare other fuels, space and sizes, use the water heater selector.
The running cost is not stated here because it depends on your own electricity rate. Multiplying 2,494 kWh by that rate gives a yearly figure for the low draw pattern. The cost calculator does this from your ZIP. The method behind the annual cost is documented separately. The 55 kWh gap to the class median of 2,439 kWh is an energy difference, and its cost also depends on your rate. An 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 find a same-class unit, use the replacement finder by model number.
DOE CCD · 2026-09-19