ARISTON ENS40L-*
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 this model's energy figure, the numbers are below. The ARISTON ENS40L-* uses 2,439 kWh of electricity a year at the low draw pattern, the standard daily hot-water usage DOE tests against. 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
- 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
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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 ARISTON model on file
What this brand files, by heater type.
UEF 0.92 · Grade G Price it on your ZIP
The registry lists this model with a UEF, the ratio of hot water delivered to energy used, of 0.92. This site, not the registry, computed 2,439 kWh from that UEF and the DOE test's daily hot-water draw for the low draw pattern. The figure applies only at that test draw, and the fuel is electricity. The tank has a rated volume of 36 gallons. The source is DOE CCD, retrieved 2026-09-19. The steps are set out on the methodology page. A home that draws more or less hot water than the test will use a different amount.
Among the 163 models registered as an electric tank at the low draw pattern, this one ranks 19th lowest for energy use. Its 2,439 kWh equals the class median of 2,439 kWh, a difference of 0 kWh. The data places it in the lowest quarter of its class for energy use. The low draw pattern describes a one- or two-person household. This model has a first hour rating, the gallons of hot water available in the first hour from a full tank, of 46 gallons. The figure suits a household close to that pattern. It does not describe a larger household, and this page holds no figure for one. To compare other fuels, spaces or sizes, use the water heater selector.
The running cost of the ARISTON ENS40L-* depends on the electricity rate you pay. For that reason no cost appears in this text. The cost calculator applies the rate for your own ZIP to the 2,439 kWh a year, which holds only at the low draw pattern. Your actual use at home is not available to this page, so the result is a calculation at the test draw, not a forecast. The installed cost appears in its own block as a modeled range, not a quote. If you need a unit in the same class, the replacement lookup by model number starts from ENS40L-*.
DOE CCD · 2026-09-19