Stiebel Eltron Mini 3-1
0.93 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 verifying the Stiebel Eltron Mini 3-1, it uses 635 kWh of electricity a year at the very small draw pattern, the standard daily hot-water usage DOE tests against. That is 20 kWh above its class median of 615 kWh, ranking 218th lowest in energy use of 271 models.
Energy use per year
635 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 218 of 271, lowest energy first.
Solid line: this model (635 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
- 0.93 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
- 0.3 gal/min DOE CCD · 2026-09-19
What it costs to install
$1,297–$1,766 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 Stiebel Eltron model on file
What this brand files, by heater type.
UEF 0.93 · Grade F Price it on your ZIP
This site calculates the 635 kWh figure; the registry does not publish it. The calculation uses the registry's UEF, the ratio of hot water delivered to energy used. It also uses the DOE test's daily hot-water draw for the very small draw pattern. For this model the UEF is 0.93. It comes from the DOE Compliance Certification Database (CCD), retrieved on 2026-09-19. The figure holds only at that test draw. A household drawing more or less hot water will use a different amount. This model is compared with the 271 models registered as an electric tankless unit at the very small draw pattern. Its use sits 20 kWh above that group's median of 615 kWh, in the highest quarter of its class for energy use. The steps behind the figure are set out in how the annual cost is calculated.
The very small draw pattern covers small units, such as a single bathroom or a point-of-use heater under a sink. The 635 kWh figure describes that use only. For a larger daily demand, this page has no energy figure, and the value above should not be applied. The listed maximum flow rate in gallons per minute is 0.3. The data does not state which fixtures that flow will serve. Readers who need a unit outside this draw pattern can compare types in the selector by fuel, space and size. Readers who want a unit in this same class, the one where this model sits 20 kWh above the median, can search by model number with the same-class replacement finder.
The text of this page gives no running cost for the 635 kWh of electricity. That cost depends on the reader's own utility electricity tariff. The data holds no single rate that fits every reader. Instead, the page works out the cost from the reader's ZIP, and the cost calculator on your own ZIP applies that tariff to this model's annual use. The 20 kWh gap to the class median is also priced at that same tariff. So the cost of the gap is unknown until the reader's rate is entered. The installed price range appears in its own block, with its source and date. It is a modeled installed-cost range, not a quote. The energy figure and the cost based on it both assume the very small draw pattern's test draw.
DOE CCD · 2026-09-19