A. O. SMITH 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).
Checking this model's yearly energy use? It is 2,494 kWh of electricity at the low draw pattern, the standard daily hot-water usage DOE tests against, a one- or two-person household. That 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
-
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.
-
Find a water heater that fits
Three questions — fuel, hot water need, install space — narrow every model on file to the ones that fit.
-
What a water heater costs to run
Prices a unit's efficiency against your own utility's filed tariff for your ZIP code.
-
Is a 30-gallon water heater enough?
Answered from what models in this size actually file.
-
Water heaters
Every model on file with the Department of Energy, by heater type.
-
All electric resistance tank water heaters
Electric tanks that file a UEF below 2.0 — heated by elements, not a heat pump.
-
Every A. O. SMITH model on file
What this brand files, by heater type.
UEF 0.9 · Grade G Price it on your ZIP
The A. O. SMITH ENJB-30 1** is an electric tank with a rated volume of 26 gallons. Its annual energy figure is 2,494 kWh, computed by this site and not by the registry. The registry's UEF, the ratio of hot water delivered to energy used, is 0.9. The site combined that UEF with the DOE test's daily hot-water draw for the low draw pattern. The calculation method is documented on the methodology page. The figure applies only at that draw. A household that uses more or less hot water will use a different amount of electricity. The energy data come from the DOE CCD, retrieved 2026-09-19.
Among the 163 models registered as an electric tank at the low draw pattern, this one has the 122nd lowest energy use. Its 2,494 kWh is 55 kWh above the class median of 2,439 kWh. That places it in the second-highest quarter of its class for energy use. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 47 gallons. The energy figure was computed for the low draw pattern only. Households with heavier hot-water use fall outside it, and no figure for them is available here. Models ranked lower on the list use less energy in this class, and you can find a same-class replacement by model number. The installed price range is not published. This model's ratings lie outside the range the cost database was fitted on.
The running cost of this model depends on your own electricity rate. This page states no cost amount, because the rate is not in the data. Multiply the 2,494 kWh at the low draw pattern by your rate for each kilowatt-hour. The cost calculator on your own ZIP does this from your utility tariff. At any one rate, the cost is higher than for a median model, since energy use is 55 kWh above the median. To compare other options, try the selector by fuel, space and size. Running cost for other draw patterns is not available on this page.
DOE CCD · 2026-09-19