A. O. SMITH ENL-50 1**
0.92 UEF DOE CCD · 2026-09-19Grade G: where this UEF sits among the 426 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
An electric tank, medium draw pattern (a typical three- or four-person household, about 55 gallons on a busy morning).
If you are checking A. O. SMITH ENL-50 1**, it uses 3,531 kWh of electricity a year. That figure is for the medium draw pattern, the standard daily hot-water usage DOE tests against. It equals the class median of 3,531 kWh, a difference of 0 kWh. It ranks 213th lowest of 426 models.
Energy use per year
3,531 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 equal to the median of 3,531 kWh for the 426 models registered in the same heater type and draw pattern; it ranks 213 of 426, lowest energy first.
Solid line: this model (3,531 kWh). Dashed line: the class median.
Min 773 kWh Median 3,531 kWh Max 3,569 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
- 0.92 DOE CCD · 2026-09-19 Compared only with other models registered as an electric tank at the medium draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- Medium 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
- 51 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 48 gal DOE CCD · 2026-09-19
What it costs to install
$1,765–$2,103 installed
Not a quote — a modeled range of what installers have charged for this class of unit; your price will vary with labor rates, access, and local code requirements.
Escalation indexes: equipment (BLS PPI) latest available: August 2026; labor (BLS ECI) latest available: April 2026 to June 2026.
NLR REMDB (BLS PPI/ECI escalated) · 2026-04-01Safety 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 50-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 0.92 · Grade G Price it on your ZIP
The annual figure of 3,531 kWh is computed by this site, not published by the registry. It uses the registry's UEF, the ratio of hot water delivered to energy used, which is 0.92 for this model. It also uses the daily hot-water draw that the DOE test assigns to the medium draw pattern. The source is the DOE CCD, retrieved 2026-09-19, and the fuel is electricity. A household that draws more or less hot water than the test will use a different amount, and this page has no measured value for that. The methodology page for water heaters sets out how the annual cost is calculated.
Against its class, the unit sits at the median. The class is the 426 models registered as an electric tank at the medium draw pattern, and its median is 3,531 kWh. This model differs from that median by 0 kWh. Its rank is 213th lowest energy use of 426, in the second-lowest quarter of its class for energy use. The first hour rating is 51 gallons. This is the gallons of hot water available in the first hour from a full tank. The rated volume is 48 gallons. These capacity values, not the energy rank, show whether the unit meets a household's morning demand. The water heater selector filters by fuel, space and size.
The running cost is not stated here because it depends on your own utility electricity rate. The cost calculator for your ZIP applies that rate to the 3,531 kWh figure. The same 3,531 kWh costs more or less as the rate changes, so this page gives no cost figure. The modeled installed-cost range is in its own block with its source and date, and it is not repeated here. Households whose hot-water use differs from the medium draw pattern should not read 3,531 kWh as their own use. To look for a unit in the same class, find a same-class replacement by model number, starting from ENL-50 1**.
DOE CCD · 2026-09-19