DoesTheMath

Ruud 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 verifying the Ruud PROPH40 T0 RH120-M, an electric tank: it uses 802 kWh of electricity a year. That figure is for the low draw pattern, the standard daily hot-water usage DOE tests against. It sits 1,637 kWh below the 2,439 kWh median of the 163 electric tanks registered at that draw pattern.

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

Report an issue with this number

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

The 802 kWh figure is computed by this site, not published by the registry. 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. For this model the UEF is 2.8. The source is the DOE CCD, retrieved 2026-09-19. The figure holds only at that test draw; this page has no figure for other daily draws. Among the 163 electric tanks registered at the low draw pattern, this model ranks 3rd lowest for energy use. That places it in the lowest quarter of its class, as the median comparison above shows.

The registry lists a rated volume of 36 gallons for this model. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 45 gallons. The low draw pattern that defines this class stands for a one- or two-person household. The rating does not cover a household that needs more than 45 gallons in its peak hour. For that household, the 3rd ranking does not address hot-water supply, because it compares annual energy use only. The water heater selector by fuel, space and size compares units on those terms. To check another unit registered in this same class, find a same-class replacement by model number.

This page gives no running cost in the text. The cost of 802 kWh of electricity a year depends on your own utility's electricity tariff, so the page computes it from your ZIP. The cost calculator on your own ZIP applies your local rate to this model's figure. The page on how the annual cost is calculated explains the steps. An installed price range is not published for this model. Its ratings lie outside the range the cost database's model was fitted on. The range is not stretched past that, so the installed price for this model is not known here.

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

Analytics cookies

We count page views without cookies for everyone, and that counter is what we use to decide what to build. Google Analytics is separate: it uses cookies to record how a page was used, and it loads only if you allow it. Decline and the site works exactly the same. What we collect.