Stiebel Eltron Mini-E 4-2
0.98 UEF DOE CCD · 2026-09-19Grade D: 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 the Stiebel Eltron Mini-E 4-2, this electric tankless unit uses 603 kWh of electricity a year. That figure applies at the very small draw pattern, the standard daily hot-water usage DOE tests against. It sits 12 kWh below its class median of 615 kWh, ranking 10th lowest energy use of 271.
Energy use per year
603 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 below the median of 615 kWh for the 271 models registered in the same heater type and draw pattern; it ranks 10 of 271, lowest energy first.
Solid line: this model (603 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
- 0.98 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
$1,311–$1,886 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 0.98 · Grade D Price it on your ZIP
This site computed the 603 kWh figure; the registry does not publish it. The calculation uses the registry's UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw for the very small draw pattern. This model's UEF is 0.98, taken from DOE CCD data retrieved 2026-09-19. The class here is the 271 models registered as electric tankless units at the very small draw pattern. Compared with that group, this unit uses 12 kWh less than the median of 615 kWh. That puts it in the lowest quarter of its class for energy use. The figure holds only at the federal test's daily draw. This text does not describe energy use at any other level of hot-water demand. The page on how the annual cost is calculated explains the method.
The very small draw pattern covers small units, such as a heater for a single bathroom or a point-of-use heater under a sink. The registry lists this model's maximum flow rate in gallons per minute as 0.4. Both that rating and the 603 kWh figure apply to this small-use setting. A home that needs hot water at several fixtures at once is outside the draw pattern used in this test. For that home, the rank of 10th of 271 does not apply, because the rank compares only units at the very small draw pattern. The water heater selector by fuel, space and size lists heaters by those criteria. To compare this unit with another model in the same class, use the same-class replacement search by model number.
This text does not give a running cost. The cost depends on your own utility's electricity tariff, and the page calculates it from your ZIP. You can run that calculation with the cost calculator for your own ZIP, which starts from the 603 kWh figure. The 12 kWh gap to the class median of 615 kWh is a difference in energy use. What that gap means in running cost depends on the rate you pay, which this text does not know. The installed price range appears in its own block on this page, with its source and date. That range is a modeled installed-cost range, not a quote, and this text does not repeat its figures.
DOE CCD · 2026-09-19