Rheem ECO 11
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).
If you are checking this unit, the Rheem ECO 11 uses 642 kWh of electricity a year at 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, ranking 249th lowest energy use 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
- 1.2 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 Rheem model on file
What this brand files, by heater type.
UEF 0.92 · Grade G Price it on your ZIP
The figure of 642 kWh is computed by this site, not by the registry. It combines the registry's UEF and the DOE test's daily hot-water draw for the very small draw pattern. UEF, the ratio of hot water delivered to energy used, is 0.92 for the Rheem ECO 11. The fuel is electricity, and the figure holds only at the federal test's draw, so it describes the test condition and not any single household's use. The source is DOE CCD, retrieved 2026-09-19. The steps behind the calculation are set out in how the annual cost is calculated.
Compared with the 271 models registered as an electric tankless unit at the very small draw pattern, this model sits 27 kWh above the class median of 615 kWh. Its rank is 249th lowest energy use of 271, which places it in the highest quarter of its class for energy use. The registry lists a maximum flow rate in gallons per minute of 1.2. The very small draw pattern covers small units, meaning a single bathroom or a point-of-use heater under a sink. For those uses the figure is the relevant one. For a larger household draw, the figure does not apply, and this page has no energy value for it.
Running cost is not stated in this text because it depends on your utility's electricity tariff. To check it, multiply 642 kWh by your own rate per kilowatt-hour, or enter your ZIP in the cost calculator. A unit using exactly the class median of 615 kWh would use 27 kWh less under the same test conditions, so the running-cost difference between the two also depends on your rate. The installed price range appears in its own block with its source and date, as a modeled range and not a quote. To compare against other units of the same class, find a same-class replacement by model number.
DOE CCD · 2026-09-19