Rheem AM004120T
0.94 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 Rheem AM004120T, it uses 628 kWh of electricity a year at the very small draw pattern, the standard daily hot-water usage DOE tests against. That is 13 kWh above the class median of 615 kWh among 271 electric tankless models.
Energy use per year
628 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 188 of 271, lowest energy first.
Solid line: this model (628 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
- 0.94 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
$1,300–$1,790 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 Rheem model on file
What this brand files, by heater type.
UEF 0.94 · Grade F Price it on your ZIP
The federal test puts the Rheem AM004120T at 628 kWh of electricity a year at the very small draw pattern. This site computed that figure, not the registry. It used the registry's UEF, the ratio of hot water delivered to energy used, which is 0.94, and the DOE test's daily hot-water draw for this draw pattern. The source is DOE CCD, retrieved 2026-09-19. Among the 271 models registered as an electric tankless unit at this draw pattern, the class median is 615 kWh, so this model sits 13 kWh above it. Its rank is 188th lowest energy use of 271, in the second-highest quarter of its class for energy use. The method behind the annual figure is documented separately.
The maximum flow rate in gallons per minute is 0.3 for this model. That limit, together with the very small draw pattern, matches small units: a single bathroom, or a point-of-use heater under a sink. For those uses, 628 kWh is the figure to check. It does not describe a household that needs more flow than 0.3. The registry data used here covers only the very small draw pattern, and an annual energy figure for larger draws is not available for this model. Someone comparing heaters of other sizes can use the water heater selector by fuel, space and size to narrow the field. The 13 kWh gap to the class median of 615 kWh is a comparison inside one class, not across heater types.
The running cost is not written here because it depends on your own utility electricity rate, and no rate is in the registry data. To see it, enter your ZIP in the cost calculator, which applies your local tariff to the 628 kWh figure. The result holds only for the federal test's daily hot-water draw at the very small draw pattern. A home that draws more or less hot water will use a different amount, and that amount is not available from this data. The modeled installed-cost range appears in its own block on this page with its source and date. For a same-class alternative, find a replacement by model number starting from AM004120T, and compare each candidate with the class median of 615 kWh.
DOE CCD · 2026-09-19