A. O. SMITH ENL-36 2**
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 the A. O. SMITH ENL-36 2**, it uses 3,531 kWh of electricity a year. That figure belongs to the medium draw pattern, the standard daily hot-water usage DOE tests against. It sits 0 kWh from the median of the 426 electric tank models registered at that pattern. It ranks 213th lowest in energy use.
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
- 33 gal DOE CCD · 2026-09-19
What it costs to install
$1,548–$1,727 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 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 A. O. SMITH model on file
What this brand files, by heater type.
UEF 0.92 · Grade G Price it on your ZIP
This site calculates the 3,531 kWh figure; the registry does not publish it. The calculation uses the registry's UEF, the ratio of hot water delivered to energy used, and the daily hot-water draw that the DOE test sets for the medium draw pattern. The registry lists a UEF of 0.92 for this model. The inputs come from the DOE CCD, retrieved 2026-09-19. The result describes the test condition, not the use in a particular home. A household that draws more hot water each day than the medium pattern can expect to use more than 3,531 kWh. A household that draws less can expect to use less. The steps behind the calculation are set out on the page explaining how the annual energy and cost figures are calculated.
Two more registry values describe this unit's capacity. The rated volume is 33 gallons. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 51 gallons. The unit fits a home whose busiest hour of hot-water use stays within that 51-gallon figure. It does not fit a home whose peak hour regularly needs more than that. It also does not fit a reader who wants below-median energy use at this test condition, because it ranks 213th lowest of 426. To compare other models, use the water heater selector by fuel, space and size. You can also find a same-class replacement by model number.
The text of this page gives no running cost. The yearly cost of 3,531 kWh depends on your own utility electricity tariff, and this page does not know that rate. The cost calculator for your own ZIP code applies your local rate to this model's figure. This model's use equals the class median of 3,531 kWh, a difference of 0 kWh. At the same rate, its running cost therefore matches that of a median model in its class. The registry does not give energy use outside the test condition, so that is not available here. The installed price range appears in its own block, with its source and date. It is a modeled installed-cost range, not a quote.
DOE CCD · 2026-09-19