Ruud Heat Pump 40-Gallon (PROUH40 T0 RU120-M)
Ruud Heat Pump 40-Gallon (PROUH40 T0 RU120-M) is a heat pump (hybrid electric) water heater from Ruud with a 36 gallon rated tank and a 45 gallon first-hour rating at a 2.8 UEF.
| Uniform Energy Factor (UEF) | 2.8 |
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| Annual electricity use | 780 kWh/yr |
| Recovery efficiency | 387 % |
| Fuel | Electric |
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| First-hour rating | 45 gal |
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| Rated storage volume | 36 gal |
| Draw pattern | Low |
| Heat pump type | 120 Volt Integrated HPWH |
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| Refrigerant (GWP) | R-134a (GWP:1430) |
| Compressor low-temp cutoff | 210 °F |
| Input voltage | 120 |
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| Max current draw | 4.5 A |
| Smart / connected capable | No |
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| Height | 62.3 in |
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| Diameter | 20.3 in |
| ENERGY STAR certified | Yes |
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Who is the Ruud Heat Pump 40-Gallon (PROUH40 T0 RU120-M) for?
- Its 45 gallon first-hour rating suits a household of 1–2 people under DOE sizing guidance.
- Estimated running cost: about $133/year at the national average electricity rate (780 kWh/yr certified use).
- Runs on a 120 V circuit (up to 4.5 A) — often no new wiring needed.
- The heat pump compressor operates down to 210 °F ambient — below that, backup elements take over.
Similar water heaters
- Friedrich Heat Pump 40-Gallon (PROH40 T0 FD120-M) (UEF 2.8)
- Friedrich Heat Pump 40-Gallon (PROH40 T0 FD120-MSO) (UEF 2.8)
- Rheem Heat Pump 40-Gallon (PROPH40 T0 RH120-M) (UEF 2.8)
- Rheem Heat Pump 40-Gallon (PROPH40 T0 RH120-MSO) (UEF 2.8)
- Rheem Heat Pump 40-Gallon (XE40T10HM00U0) (UEF 2.8)
- Rheem Heat Pump 40-Gallon (XE40T10HMS00U0) (UEF 2.8)
Frequently asked questions
Is the Ruud Heat Pump 40-Gallon (PROUH40 T0 RU120-M) ENERGY STAR certified?
Yes, the Ruud Heat Pump 40-Gallon (PROUH40 T0 RU120-M) holds a current ENERGY STAR certification for water heating efficiency (UEF 2.8).
How much does the Ruud Heat Pump 40-Gallon (PROUH40 T0 RU120-M) cost to run per year?
About $133 per year at national average energy rates, based on its certified annual energy use under the DOE test draw pattern. Your rate and usage change this figure.
What electrical circuit does the Ruud Heat Pump 40-Gallon (PROUH40 T0 RU120-M) need?
The Ruud Heat Pump 40-Gallon (PROUH40 T0 RU120-M) runs on a 120 V circuit drawing up to 4.5 A — many installations use an existing outlet with no new wiring.
Is the Ruud Heat Pump 40-Gallon (PROUH40 T0 RU120-M) a smart water heater?
No, the Ruud Heat Pump 40-Gallon (PROUH40 T0 RU120-M) is not connected-capable — it has no app connectivity or demand-response support.
Sources
- data.energystar.gov (retrieved 2026-07-17)