Rheem Heat Pump 40-Gallon (XE40T10HS45U0)
Rheem Heat Pump 40-Gallon (XE40T10HS45U0) is a heat pump (hybrid electric) water heater from Rheem with a 36 gallon rated tank and a 60 gallon first-hour rating at a 3.83 UEF.
| Uniform Energy Factor (UEF) | 3.83 |
|---|---|
| Annual electricity use | 859 kWh/yr |
| Recovery efficiency | 434 % |
| Fuel | Electric |
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| First-hour rating | 60 gal |
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| Rated storage volume | 36 gal |
| Draw pattern | Medium |
| Heat pump type | 240 Volt Integrated HPWH |
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| Refrigerant (GWP) | R-134a (GWP:1430) |
| Compressor low-temp cutoff | 37 °F |
| Input voltage | 240 |
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| Max current draw | 21 A |
| Smart / connected capable | No |
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| Height | 45 in |
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| Diameter | 16 in |
| ENERGY STAR certified | Yes |
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Who is the Rheem Heat Pump 40-Gallon (XE40T10HS45U0) for?
- Its 60 gallon first-hour rating suits a household of 2–3 people under DOE sizing guidance.
- Estimated running cost: about $146/year at the national average electricity rate (859 kWh/yr certified use).
- Needs a 240 V circuit; at 21 A max draw plan for a 30 A breaker (NEC 125% continuous-load rule).
- The heat pump compressor operates down to 37 °F ambient — below that, backup elements take over.
Similar water heaters
- Friedrich Heat Pump 40-Gallon (PROH40 T2 FD310BM) (UEF 3.5)
- Friedrich Heat Pump 40-Gallon (PROH40 T2 FD310UM) (UEF 3.5)
- Friedrich Heat Pump 40-Gallon (PROH40 T2 FD350BM) (UEF 3.5)
- Friedrich Heat Pump 40-Gallon (PROH40 T2 FD350UM) (UEF 3.5)
- Friedrich Heat Pump 40-Gallon (PROH40 T2 FD400-30) (UEF 3.83)
- Friedrich Heat Pump 40-Gallon (PROH40 T2 FD400-SO) (UEF 3.83)
Frequently asked questions
Is the Rheem Heat Pump 40-Gallon (XE40T10HS45U0) ENERGY STAR certified?
Yes, the Rheem Heat Pump 40-Gallon (XE40T10HS45U0) holds a current ENERGY STAR certification for water heating efficiency (UEF 3.83).
How much does the Rheem Heat Pump 40-Gallon (XE40T10HS45U0) cost to run per year?
About $146 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 (XE40T10HS45U0) need?
The Rheem Heat Pump 40-Gallon (XE40T10HS45U0) runs on a 240 V circuit drawing up to 21 A; per the NEC 125% continuous-load rule plan for at least a 30 A breaker (check the installation manual for the required circuit).
Is the Rheem Heat Pump 40-Gallon (XE40T10HS45U0) a smart water heater?
No, the Rheem Heat Pump 40-Gallon (XE40T10HS45U0) is not connected-capable — it has no app connectivity or demand-response support.
Sources
- data.energystar.gov (retrieved 2026-07-17)