ARISTON ENS30LUB 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 this water heater's figures, the ARISTON ENS30LUB 240V-3500W 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, among 163 electric tank 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
- 35 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 27 gal DOE CCD · 2026-09-19
What it costs to install
$1,461–$1,577 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
-
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.
-
Find a water heater that fits
Three questions — fuel, hot water need, install space — narrow every model on file to the ones that fit.
-
What a water heater costs to run
Prices a unit's efficiency against your own utility's filed tariff for your ZIP code.
-
Is a 30-gallon water heater enough?
Answered from what models in this size actually file.
-
Water heaters
Every model on file with the Department of Energy, by heater type.
-
All electric resistance tank water heaters
Electric tanks that file a UEF below 2.0 — heated by elements, not a heat pump.
-
Every ARISTON model on file
What this brand files, by heater type.
UEF 0.92 · Grade G Price it on your ZIP
The figure of 2,439 kWh is computed by this site, not published by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, which is 0.92 for this model, with the DOE test's daily hot-water draw for the low draw pattern. The source is the DOE CCD, retrieved 2026-09-19. The fuel is electricity, and the heater type is an electric tank. Because the figure rests on that test draw, it describes the test condition and not the use in any particular home. The method behind the annual cost sets out how the calculation is done.
Among the 163 models registered as an electric tank at the low draw pattern, this unit ranks 19th lowest for energy use, which places it in the lowest quarter of its class. Its 2,439 kWh is equal to the class median of 2,439 kWh, a difference of 0 kWh. The data given here does not explain how models with the same figure are ordered. The low draw pattern corresponds to a one- or two-person household. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 35 gallons, and the rated volume is 27 gallons. A household that draws more hot water than the low pattern is outside what these figures describe, and no figure for other draw patterns is available here. The water heater selector filters by fuel, space and size.
The running cost is not stated in the text because it depends on your own utility electricity tariff. The yearly figure of 2,439 kWh at the low draw pattern is the quantity that your rate applies to. The cost calculator uses your ZIP to work out the cost from that figure. The modeled installed-cost range appears in its own block on this page with its source and date. It is a modeled range, not a quote, and it is not repeated here. To look up units in the same class as ENS30LUB 240V-3500W, you can find a same-class replacement by model number.
DOE CCD · 2026-09-19