Lennox WHES040L45SN240B****
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).
Checking the Lennox WHES040L45SN240B****? At the low draw pattern, the standard daily hot-water usage DOE tests against, this electric tank uses 2,439 kWh a year. Low draw pattern means a one- or two-person household. That equals the class median of 2,439 kWh, a difference of 0 kWh, among 163 registered models.
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
- 46 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 Lennox model on file
What this brand files, by heater type.
UEF 0.92 · Grade G Price it on your ZIP
The annual figure of 2,439 kWh is electricity use for the Lennox WHES040L45SN240B**** at the low draw pattern. This site computed it, not the registry. It starts from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.92 here. It then applies the DOE test's daily hot-water draw for this pattern. The source is DOE CCD, retrieved 2026-09-19. The class median for the 163 electric tank models at the low draw pattern is 2,439 kWh, so the difference is 0 kWh. The rank is 19th lowest energy use of 163, in the lowest quarter of the class. This page's data does not show why a figure equal to the median ranks in the lowest quarter, so that reason is not available. The method for the annual figure is documented separately.
The low draw pattern describes a one- or two-person household, and that is the household this figure fits. The model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 46 gallons. Its rated volume is 36 gallons. These are the two capacity values to compare with a household's hot-water demand. The figure of 2,439 kWh does not describe larger households, because it is tied to the low draw pattern. Energy use at other draw patterns is not available for this model on this page. To compare by fuel, space and size, use the water heater selector, or find a same-class replacement by model number.
Running cost is not stated in this text because it depends on your own utility electricity tariff. The cost is 2,439 kWh multiplied by your rate per kilowatt-hour, and that rate differs between utilities. The cost calculator on your own ZIP applies your rate to this model's figure. The result carries the same limits as the energy figure. It reflects the DOE test's daily draw for the low draw pattern, and measured use in a specific home is not available. It also leaves out installation. A modeled installed-cost range is shown in its own block on this page with its source and date, and it is a range, not a quote.
DOE CCD · 2026-09-19