Aquapower Mini 4-2
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 what this unit uses, the Aquapower Mini 4-2 electric tankless heater uses 622 kWh 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 among 271 registered 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
- 0.4 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 Aquapower 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 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 DOE CCD, retrieved 2026-09-19. Electricity is the only fuel involved. Among the 271 electric tankless models registered at this draw pattern, the Aquapower Mini 4-2 ranks 152nd lowest for energy use. Its class median is 615 kWh, so the model sits 7 kWh above that median. The registry also lists a maximum flow rate in gallons per minute of 0.4.
This draw pattern covers small units, meaning a bathroom or a point-of-use heater under a sink. The 0.4 flow rate is the registry value, and it limits how much water can be heated at a time. Whether it covers a particular fixture is not in the registry data used here. The 622 kWh figure applies only to the federal test's daily draw, so a site that draws more hot water than that test assumes will use more energy. Measured use in real homes is not available. The distance of 7 kWh from the class median of 615 kWh is a registry comparison only. To compare against other fuels or sizes, use the selector by fuel, space and size, or find a same-class replacement by model number.
The running cost is not stated in this text, because it depends on your own utility electricity tariff. It is the 622 kWh figure multiplied by your rate per kilowatt-hour, and the rate varies by utility and by ZIP. The cost calculator on your own ZIP applies your local rate to this model. The steps behind that calculation, including how the test draw and the 0.95 value are used, are set out in how the annual cost is calculated. The installed price appears in its own block on this page as a modeled range with its source and date. It is not a quote, and it is not restated here.
DOE CCD · 2026-09-19