AMERICAN STANDARD WATER HEATERS ENS40LU-*
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).
Verifying the AMERICAN STANDARD WATER HEATERS ENS40LU-*? This electric tank uses 2,466 kWh a year. That figure is at the low draw pattern, the standard daily hot-water usage DOE tests against, here a one- or two-person household. It sits 27 kWh above the class median of 2,439 kWh, ranking 88th lowest of 163.
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
- 41 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
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 AMERICAN STANDARD WATER HEATERS model on file
What this brand files, by heater type.
UEF 0.91 · Grade G Price it on your ZIP
The 2,466 kWh figure comes from this site's own calculation, not from the registry. One input is the model's UEF, the ratio of hot water delivered to energy used, which is 0.91. The other input is the DOE test's daily hot-water draw for the low draw pattern. The registry data come from the DOE Compliance Certification Database (CCD), retrieved 2026-09-19. A household that draws more or less hot water than that test day will use a different amount of energy. This model is compared with the 163 models registered as an electric tank at the low draw pattern. Among them, it sits in the second-highest quarter for energy use. The page on how the annual cost is calculated sets out each step of this method.
The 2,466 kWh rating applies only to the household size that the low draw pattern represents. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 41 gallons. Its rated volume is 36 gallons. A home that needs more than 41 gallons in its busiest hour asks for more than that rating describes. The data here cover the low draw pattern only, so an annual energy figure at a higher draw is not available. Readers who want to look at other fuels or sizes can use the selector by fuel, space and size. A plumber who needs to match this unit can find a same-class replacement by model number.
The running cost is not stated in this text. The cost of 2,466 kWh of electricity depends on your own utility tariff. The cost calculator on your own ZIP works it out from your ZIP code. At any single rate, the 27 kWh gap to the class median raises the yearly bill in proportion to that rate. No installed price range is published for this model. Its ratings lie outside the range the cost database's model was fitted on. The page does not stretch that range to cover these ratings. The installed cost of the AMERICAN STANDARD WATER HEATERS ENS40LU-* is therefore unknown here, and this page does not estimate it.
DOE CCD · 2026-09-19