Rheem SPEX4277
0.96 UEF DOE CCD · 2026-09-19Grade E: 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 Rheem SPEX4277, an electric tankless unit, it uses 615 kWh of electricity a year. That figure applies at the very small draw pattern, the standard daily hot-water usage DOE tests against. It equals the class median of 615 kWh, a difference of 0 kWh, and ranks 77th lowest of 271 similar models.
Energy use per year
615 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 equal to the median of 615 kWh for the 271 models registered in the same heater type and draw pattern; it ranks 77 of 271, lowest energy first.
Solid line: this model (615 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
- 0.96 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
$1,306–$1,838 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 0.96 · Grade E Price it on your ZIP
The 615 kWh figure is computed by this site, not published by the registry. It combines the model's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the very small draw pattern. For this unit the UEF is 0.96. The inputs come from the DOE Compliance Certification Database, retrieved 2026-09-19. The result holds only at the federal test's daily draw. For a household whose daily hot-water use differs from the test's, annual use is not available from the registry data. The steps behind the figure are set out in how the annual energy and cost figures are calculated.
The very small draw pattern covers units sized for a single bathroom, or a point-of-use heater under a sink. The SPEX4277 lists a maximum flow rate in gallons per minute of 0.4. A home whose hot-water needs go beyond a single bathroom or sink is outside the draw pattern this rating was tested at. Within its own class, the 615 kWh sits 0 kWh from the median of the 271 electric tankless units registered at this draw pattern. It ranks 77th lowest energy use of 271. Readers who need a different fuel or size can compare options in the water heater selector by fuel, space and size.
The running cost is not stated in this text, because it depends on your own utility electricity tariff. The page computes it from your ZIP by applying that tariff to the 615 kWh of yearly use at the very small draw pattern. A different tariff gives a different result, while the energy figure stays tied to the test condition. You can repeat the calculation with the running cost calculator for your own ZIP. The installed price appears in its own block with its source and date, as a modeled range rather than a quote. If you are checking a swap for the Rheem SPEX4277, the same-class replacement search by model number covers this class of 271 models.
DOE CCD · 2026-09-19