A. O. SMITH UPVA-35E 1**
0.92 UEF DOE CCD · 2026-09-19Grade G: 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).
Checking A. O. SMITH UPVA-35E 1**? Its 642 kWh a year of electricity applies to the very small draw pattern, the standard daily hot-water usage DOE tests against. That is 27 kWh above the class median of 615 kWh, and 249th lowest of 271 models.
Energy use per year
642 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 249 of 271, lowest energy first.
Solid line: this model (642 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
- 0.92 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
- 0.4 gal/min DOE CCD · 2026-09-19
What it costs to install
$1,294–$1,742 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 A. O. SMITH model on file
What this brand files, by heater type.
UEF 0.92 · Grade G Price it on your ZIP
The 642 kWh figure is computed by this site, not by the registry. It uses the registry's UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw. This model's UEF is 0.92, and its maximum flow rate in gallons per minute is 0.4. The figure holds only for this model at the very small draw pattern, and its source is DOE CCD, retrieved 2026-09-19. Real homes draw different amounts of hot water, so measured use will differ. The method for the annual cost is documented separately on this site.
Among the 271 electric tankless models at this draw pattern, this one sits 27 kWh above the class median of 615 kWh. That rank puts it in the highest quarter of its class for energy use, so most comparable models use less electricity. The model is registered for that use: small units, such as a single bathroom or a point-of-use heater under a sink. It is a weaker match for a reader ranking models by energy use alone, since the median model uses 27 kWh less. This comparison covers only the very small draw pattern, so it says nothing about larger loads.
Running cost equals the annual energy multiplied by the reader's own electricity rate. The rate depends on the utility, so no cost is stated in this text. The cost calculator applies a local tariff, found from the reader's ZIP, to the 642 kWh shown here. The result is a calculation at the very small draw pattern, not a forecast of a bill. A reader who wants another model of this class can find a same-class replacement by model number. The installed price range appears in its own block on this page, with its source and date.
DOE CCD · 2026-09-19