AMERICAN STANDARD WATER HEATERS ENS40LUB 240V-3500W
0.92 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).
If you are checking what the AMERICAN STANDARD WATER HEATERS ENS40LUB 240V-3500W uses in a year: 2,439 kWh of electricity at the low draw pattern, the standard daily hot-water usage DOE tests against, for a one- or two-person household. That equals the class median of 2,439 kWh, a difference of 0 kWh.
Energy use per year
2,439 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 2,439 kWh for the 163 models registered in the same heater type and draw pattern; it ranks 19 of 163, lowest energy first.
Solid line: this model (2,439 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
- 0.92 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
- 39 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 36 gal DOE CCD · 2026-09-19
What it costs to install
$1,591–$1,802 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 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 AMERICAN STANDARD WATER HEATERS model on file
What this brand files, by heater type.
UEF 0.92 · Grade G Price it on your ZIP
The registry does not state the annual figure. This site computes it from the registry's UEF and the DOE test's daily hot-water draw for the low draw pattern. UEF, the ratio of hot water delivered to energy used, is 0.92 for this model. The result is 2,439 kWh of electricity a year, and it holds only at that test draw. The source is the DOE CCD, retrieved 2026-09-19. Actual use in a home depends on how much hot water the household draws, so the figure is a basis for comparison and not a prediction for one house. The calculation method sets out how the annual cost is derived from it.
The class here is the 163 models registered as an electric tank at the low draw pattern. Its median is 2,439 kWh, and this model differs from that median by 0 kWh. Its rank is 19th lowest energy use of 163, which places it in the lowest quarter of its class. Both statements come from the class data as given, and this page does not explain how they fit together. The low draw pattern suits a one- or two-person household. For that use the model lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 39 gallons, and a rated volume of 36 gallons. The figure does not describe larger households, and their energy use at other draw patterns is not available here. The water heater selector filters by fuel, space and size.
The running cost is not written in the text, because it depends on your own utility electricity rate. Multiplying 2,439 kWh by that rate gives the yearly cost at the low draw pattern. The cost calculator does this from your ZIP. The installed price range appears in its own block with its source and date, as a modeled installed-cost range and not a quote, so it is not restated here. If you are checking a replacement for the ENS40LUB 240V-3500W, you can find a same-class replacement by model number. Compare at the same draw pattern, because the UEF of 0.92 and the annual figure apply only to the low draw pattern.
DOE CCD · 2026-09-19