DoesTheMath

Rheem PROPH40 T0 RH120-M

2.8 UEF DOE CCD · 2026-09-19
A

Grade A: 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 checking the Rheem PROPH40 T0 RH120-M against its registry listing, start with its yearly energy use. It uses 802 kWh of electricity a year at the low draw pattern, the standard daily hot-water usage DOE tests against. That pattern represents a one- or two-person household. The figure is 1,637 kWh below its class median of 2,439 kWh.

Energy use per year

802 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 2,439 kWh for the 163 models registered in the same heater type and draw pattern; it ranks 3 of 163, lowest energy first.

This model: 802 kWh

Solid line: this model (802 kWh). Dashed line: the class median.

Min 724 kWh Median 2,439 kWh Max 2,550 kWh

DOE CCD · 2026-09-19

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What it costs to run where you live

Enter your ZIP to see what this unit costs to run a year on your own utility’s electricity rate.

What the registry files

UEF (Uniform Energy Factor) how much hot water you get for each unit of energy the heater uses
2.8 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
45 gal DOE CCD · 2026-09-19
Rated Storage Volume the tank size in gallons
36 gal DOE CCD · 2026-09-19
On the market since (ENERGY STAR) the date the manufacturer told ENERGY STAR the model went on sale
2022-04-21 ENERGY STAR · 2026-09-19
Connected / demand response (ENERGY STAR) whether the unit can take signals from your utility to shift when it heats, and by which standard (such as CTA-2045)
No ENERGY STAR · 2026-09-19
Refrigerant and GWP (ENERGY STAR) the refrigerant a heat pump unit uses and its global warming potential, a leak's climate effect relative to carbon dioxide (CO2 = 1)
R-134a, GWP 1430 ENERGY STAR · 2026-09-19

What it costs to install

Not published: Installed cost range

This model's UEF 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 · 2026-09-24

Every water heater recall on file since 2015

Does it fit your space?

Enter your own numbers below — this compares them to what ENERGY STAR publishes for this model, it does not tell you what to buy.

Compressor operating range (ENERGY STAR)
the air temperatures around the unit in which its heat pump runs; outside this range the heat pump stops
Dimensions (ENERGY STAR)
the unit's filed height, width, depth or tank diameter, in inches
Input voltage and maximum current (ENERGY STAR)
the circuit voltage the unit is certified on and the most current it draws
  • Ambient temperatureEnter your numbers210°F min
  • Physical footprintEnter your numbers20.3" ⌀
  • Electrical supplyEnter your numbers120V, 4.5A max
 ENERGY STAR · 2026-09-19

What these figures mean

This site computed the 802 kWh figure; the registry does not publish it. It 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 low draw pattern. This model's UEF is 2.8, from DOE CCD data retrieved 2026-09-19. The class is the 163 models registered as an electric tank at the low draw pattern. This model is 3rd lowest in energy use of 163, which puts it in the lowest quarter of that class. The comparison holds only at the test's daily draw. The figure does not describe other usage levels. The page on how the annual cost is calculated sets out each step.

Because the test uses the low draw pattern, the 802 kWh figure applies to a one- or two-person household. The tank has a rated volume of 36 gallons. It also has a first hour rating, the gallons of hot water available in the first hour from a full tank, of 45 gallons. A household that needs more than 45 gallons in its busiest hour is outside what this rating covers. For that household, the yearly figure does not apply either, because it rests on the low pattern's daily draw. Energy use at a higher draw is not available on this page. The selector by fuel, space and size compares other sizes and fuels. You can also find a same-class replacement by model number.

The running cost is not stated here because it depends on your own utility's electricity rate. The page computes it from your ZIP using the 802 kWh yearly figure at the low draw pattern. The cost calculator on your own ZIP runs the same calculation. This model uses 1,637 kWh less than the class median of 2,439 kWh. On any single rate, its running cost is therefore below that of a model using the class median. No installed price range is published for this model. Its ratings lie outside the range that the cost database's model was fitted on. The site does not stretch that range to cover them, so the installed price is unknown on this page.

DOE CCD · 2026-09-19

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

UEF 2.8 · Grade A Price it on your ZIP

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