Ruud PROE28 S2 RH93 SB
0.92 UEF DOE CCD · 2026-09-19Grade G: where this UEF sits among the 163 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
An electric tank, low draw pattern (a one- or two-person household).
If you are verifying the Ruud PROE28 S2 RH93 SB, an electric tank, it uses 2,439 kWh of electricity a year. That figure holds for the low draw pattern, the standard daily hot-water usage DOE tests against, at the federal test's daily draw. It equals the median of 2,439 kWh for the 163 models in its class.
Energy use per year
2,439 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 2,439 kWh for the 163 models registered in the same heater type and draw pattern; it ranks 19 of 163, lowest energy first.
Solid line: this model (2,439 kWh). Dashed line: the class median.
Min 724 kWh Median 2,439 kWh Max 2,550 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 tank at the low draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- Low DOE CCD · 2026-09-19
- First Hour Rating how many gallons of hot water the unit can deliver in one hour, starting from a full tank
- 48 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 26 gal DOE CCD · 2026-09-19
What it costs to install
Not published: Installed cost range
This model's rated tank size lies outside the range NLR REMDB's cost model was fitted on, and the range is not stretched past it.
The annual energy figure on this page does not depend on this range and is unaffected.
Safety 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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Is a 30-gallon water heater enough?
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 resistance tank water heaters
Electric tanks that file a UEF below 2.0 — heated by elements, not a heat pump.
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Every Ruud model on file
What this brand files, by heater type.
UEF 0.92 · Grade G Price it on your ZIP
This site computes the 2,439 kWh figure; the registry does not publish it. The calculation uses the registry's UEF, the ratio of hot water delivered to energy used, of 0.92. It also uses the DOE test's daily hot-water draw for the low draw pattern. The source is the DOE CCD, retrieved 2026-09-19. The class is the 163 models registered as an electric tank at the low draw pattern. Within that class, this model ranks 19th lowest in energy use, which places it in the lowest quarter. Its difference from the class median of 2,439 kWh is 0 kWh. The data therefore place it both at the median and in the lowest quarter. The registry data here do not explain how both positions hold at once.
The low draw pattern corresponds to a one- or two-person household. The model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 48 gallons. Its rated volume is 26 gallons. For a household whose daily use matches the low draw pattern, 2,439 kWh is the relevant yearly figure. The figure does not describe a household that draws more hot water each day, because the test assumes the low draw only. Energy use at a larger daily draw is not available in this data. To compare units of other sizes or fuels, use the water heater selector by fuel, space and size. To match this unit within its class, find a same-class replacement by model number.
The text gives no running cost for this model. The cost of 2,439 kWh of electricity depends on your own utility tariff, which this page does not know in advance. The cost calculator for your own ZIP applies your local electricity rate to that yearly figure. The steps behind that result are set out in how the annual cost is calculated. This page also does not publish an installed price range for this model. Its ratings, including the UEF of 0.92 and the rated volume above, lie outside the range the cost database's model was fitted on. The site does not stretch that range to cover them. The installed price for this unit is therefore unknown here.
DOE CCD · 2026-09-19