A. O. SMITH ENLB-50W 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).
Checking the A. O. SMITH ENLB-50W 1**? It uses 2,466 kWh of electricity a year at the low draw pattern, the standard daily hot-water usage DOE tests against. That pattern represents a one- or two-person household. The figure is 27 kWh above the class median of 2,439 kWh across 163 models.
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
- 40 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 44 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 40-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 A. O. SMITH model on file
What this brand files, by heater type.
UEF 0.91 · Grade G Price it on your ZIP
This site computed the figure of 2,466 kWh; the registry does not publish it. The inputs are the registry's UEF, the ratio of hot water delivered to energy used, which is 0.91 for this model, and the DOE test's daily hot-water draw for the low draw pattern. The DOE CCD data was retrieved 2026-09-19. Against the class median of 2,439 kWh, the model sits 27 kWh higher. It ranks 88th lowest in energy use among 163 models, which places it in the second-highest quarter of its class for energy use. The calculation is described on the methodology page.
The registry lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 40 gallons, and a rated volume of 44 gallons. The 2,466 kWh figure applies only at the low draw pattern, which represents a one- or two-person household. A household that uses more hot water each day than the federal test assumes is not described by this figure, and this page has no value for any other draw pattern. To compare by fuel, space and size, use the water heater selector. To look for a unit in the same class, use the replacement finder.
The running cost is not written here because it depends on your own utility electricity tariff. Multiplying 2,466 kWh by your rate per kilowatt-hour gives the yearly cost at the low draw pattern, and the cost calculator does this from your ZIP. The 27 kWh gap to the class median of 2,439 kWh is also priced at your rate, so its cost cannot be stated without it. 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 that range is not stretched past it.
DOE CCD · 2026-09-19