Rheem Heat Pump 40-Gallon (XE40T10HM00U0)
Rheem Heat Pump 40-Gallon (XE40T10HM00U0) is a heat pump (hybrid electric) water heater from Rheem 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 Rheem Heat Pump 40-Gallon (XE40T10HM00U0) 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 (XE40T10HMS00U0) (UEF 2.8)
- Richmond Heat Pump 40-Gallon (10E40-HP120M) (UEF 2.8)
Frequently asked questions
Is the Rheem Heat Pump 40-Gallon (XE40T10HM00U0) ENERGY STAR certified?
Yes, the Rheem Heat Pump 40-Gallon (XE40T10HM00U0) holds a current ENERGY STAR certification for water heating efficiency (UEF 2.8).
How much does the Rheem Heat Pump 40-Gallon (XE40T10HM00U0) 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 Rheem Heat Pump 40-Gallon (XE40T10HM00U0) need?
The Rheem Heat Pump 40-Gallon (XE40T10HM00U0) runs on a 120 V circuit drawing up to 4.5 A — many installations use an existing outlet with no new wiring.
Is the Rheem Heat Pump 40-Gallon (XE40T10HM00U0) a smart water heater?
No, the Rheem Heat Pump 40-Gallon (XE40T10HM00U0) is not connected-capable — it has no app connectivity or demand-response support.
Sources
- data.energystar.gov (retrieved 2026-07-17)