Rinnai REHP50 50-Gallon
Rinnai REHP50 50-Gallon is a heat pump (hybrid electric) water heater from Rinnai with a 46 gallon rated tank and a 73 gallon first-hour rating at a 3.75 UEF.
| Uniform Energy Factor (UEF) | 3.75 |
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| Annual electricity use | 844 kWh/yr |
| Recovery efficiency | 465 % |
| Fuel | Electric |
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| First-hour rating | 73 gal |
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| Rated storage volume | 46 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 | 37.4 °F |
| Input voltage | 240 |
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| Max current draw | 24 A |
| Smart / connected capable | No |
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| Height | 66.4 in |
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| Diameter | 21.7 in |
| ENERGY STAR certified | Yes |
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Who is the Rinnai REHP50 50-Gallon for?
- Its 73 gallon first-hour rating suits a household of 3–4 people under DOE sizing guidance.
- Estimated running cost: about $143/year at the national average electricity rate (844 kWh/yr certified use).
- Needs a 240 V circuit; at 24 A max draw plan for a 30 A breaker (NEC 125% continuous-load rule).
- The heat pump compressor operates down to 37.4 °F ambient — below that, backup elements take over.
Similar water heaters
- Rinnai REHP50 50-Gallon (REHP50C) (UEF 3.75)
- Rinnai REHP50BM 50-Gallon (UEF 3.75)
- SANCO2 40-Gallon (GS5-45HPC-D HP + ECO-43SSAQB) (UEF 3.7)
- SANCO2 40-Gallon (GS5-45HPC HP + ECO-43SSAQB) (UEF 3.7)
- A. O. Smith Split System Heat Pump 50-Gallon (HPACO-45 1-+AXST-50LBTTP 1) (UEF 3.55)
- A. O. Smith Split System Heat Pump 50-Gallon (HPACO-45C 1-+AXST-50LBCTTP 1) (UEF 3.55)
Frequently asked questions
Is the Rinnai REHP50 50-Gallon ENERGY STAR certified?
Yes, the Rinnai REHP50 50-Gallon holds a current ENERGY STAR certification for water heating efficiency (UEF 3.75).
How much does the Rinnai REHP50 50-Gallon cost to run per year?
About $143 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 Rinnai REHP50 50-Gallon need?
The Rinnai REHP50 50-Gallon runs on a 240 V circuit drawing up to 24 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 Rinnai REHP50 50-Gallon a smart water heater?
No, the Rinnai REHP50 50-Gallon is not connected-capable — it has no app connectivity or demand-response support.
Sources
- data.energystar.gov (retrieved 2026-07-17)