Rheem SPEX4277T
0.97 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 SPEX4277T, it uses 609 kWh of electricity a year at the federal test's daily hot-water draw for the very small draw pattern, the standard daily hot-water usage DOE tests against. That is 6 kWh below the 615 kWh median of the 271 electric tankless units in its class.
Energy use per year
609 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 37 of 271, lowest energy first.
Solid line: this model (609 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
- 0.97 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
$1,309–$1,862 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 0.97 · Grade E Price it on your ZIP
This site computed the 609 kWh figure; the registry does not publish it. The figure combines the registry'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 model the UEF is 0.97. The inputs come from the DOE CCD, retrieved 2026-09-19. The figure describes the federal test's draw, not a measured household. A home that draws more hot water each day than the test assumes will use more electricity than 609 kWh. A home that draws less will use less. The registry does not report how far real use departs from the test, so that gap is not available here. The steps are set out in how this site calculates annual energy and cost.
The very small draw pattern covers small units: a single bathroom, or a point-of-use heater under a sink. This model's maximum flow rate in gallons per minute is 0.4, as registered. The 609 kWh figure describes a use that matches that small pattern. A plan to serve a whole house, or several fixtures at once, falls outside this draw pattern, and the figure does not describe it. Within its class, the model ranks 37th lowest energy use of 271, which places it in the lowest quarter for energy use. Its gap to the class median is 6 kWh a year at the test's draw. To compare other units by fuel, space and size, use the water heater selector. To match this model within the same class, use find a same-class replacement by model number.
This text does not give a running cost. The cost depends on your own utility electricity tariff, and no tariff is assumed here. The page applies your rate to the 609 kWh at the federal test's draw, using the ZIP you enter. To see the figure for your rate, open the running cost calculator for your own ZIP. The 6 kWh difference from the 615 kWh class median converts to cost at the same rate, so its value also depends on your tariff. Neither amount is available until a ZIP is entered. The installed price range appears in its own block on this page, with its source and date. That block shows a modeled installed-cost range, not a quote, and this text does not restate its figures.
DOE CCD · 2026-09-19