ARISTON AURES SM 10.5 240V US*
0.95 UEF DOE CCD · 2026-09-19Grade F: where this UEF sits among the 271 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
An electric tankless unit, very small draw pattern (small units - a single bathroom, or a point-of-use heater under a sink).
If you are checking this unit's figures, the ARISTON AURES SM 10.5 240V US* uses 622 kWh of electricity a year at the very small draw pattern, the standard daily hot-water usage DOE tests against. That is 7 kWh above the class median of 615 kWh, and it ranks 152nd lowest in energy use among 271 models.
Energy use per year
622 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 615 kWh for the 271 models registered in the same heater type and draw pattern; it ranks 152 of 271, lowest energy first.
Solid line: this model (622 kWh). Dashed line: the class median.
Min 562 kWh Median 615 kWh Max 649 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
- 0.95 DOE CCD · 2026-09-19 Compared only with other models registered as an electric tankless unit at the very small draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- Very small DOE CCD · 2026-09-19
- Maximum Gallons Per Minute how many gallons a minute it can heat while running continuously
- 1.1 gal/min DOE CCD · 2026-09-19
What it costs to install
$1,303–$1,814 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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How to size a tankless water heater by GPM
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 tankless water heaters
Electric instantaneous units, sized by flow rate rather than tank gallons.
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Every ARISTON model on file
What this brand files, by heater type.
UEF 0.95 · Grade F Price it on your ZIP
The figure of 622 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, of 0.95 with the DOE test's daily hot-water draw for the very small draw pattern. The source is the DOE CCD, retrieved 2026-09-19. The figure applies only at that test draw. A household that draws more or less hot water will use a different amount, and the registry gives no value for those cases. The registry also lists the maximum flow rate in gallons per minute as 1.1. How the annual figures are calculated is documented separately.
The comparison group is the 271 models registered as an electric tankless unit at the very small draw pattern. This model sits 7 kWh above the class median of 615 kWh. Its rank of 152nd lowest energy use places it in the second-highest quarter of its class for energy use. Both the median and the rank are measured at the test draw, so they show how registry values compare and not how any one home will perform. Gas and storage heaters are outside this comparison. To see other models in the same class, use the same-class replacement search by model number.
The 622 kWh figure fits the small units this draw pattern describes: a single bathroom, or a point-of-use heater under a sink. It does not describe a household with larger hot-water demand, because no figure is available here for other draw patterns. The registry's maximum flow rate of 1.1 gallons per minute is a stated limit, and the data does not say whether it meets a particular fixture's demand. The running cost depends on your own utility electricity rate, so no cost is stated in this text. The cost calculator on your own ZIP applies your tariff to 622 kWh. The modeled installed-cost range appears in its own block on the page.
DOE CCD · 2026-09-19