Appliances / Heat pump water heaters / Rinnai
Rinnai REHP50BM
46 gal · 240-volt integrated heat pump water heater
Check the price at the store, then add $1,996 of electricity to get the true cost. We may earn a commission if you buy through these links; as an Amazon Associate we earn from qualifying purchases.
- Price. Check what it costs at the store.
- Plus running cost. Add $1,996 of electricity over 13 years. That is the part the price tag hides.
- Compare. Pick your state below, then check the cheaper-to-run models of the same size.
About the Rinnai REHP50BM
The Rinnai REHP50BM is a 46 gal 240-volt integrated heat pump water heater certified by ENERGY STAR. Its official test figure is 844 kWh of electricity a year, which at the U.S. average price of 18.19¢ per kWh comes to $154 a year, or $1,996 over a typical 13-year life.
For the same hot water, a standard electric tank water heater would use about 3,440 kWh a year, so this model uses 75% less electricity and saves about $472 a year.
Among 371 240-volt integrated models it ranks #23 for running cost, in the cheapest 10%. The cheapest model of this type would save $475 in electricity over 13 years, though it may differ in size and features.
If you want the same type and a similar size for less to run, the GE Profile PH40S10BPY01 uses 773 kWh a year and would save about $168 over 13 years.
Cost to run where you live
844 kWh a year (ENERGY STAR test figure) × 18.19¢ per kWh, the average residential price in the U.S. for Jan–Aug 2026 (EIA). Your bill depends on your utility and how you use it.
Cheaper to run, same type and size
Or see every under 50 gallons model ranked.
| GE Profile PH40S10BPY01 | 40 gal | $141/yr | saves $168 |
| A. O. Smith HPS10-50H45DV 2 series | 46 gal | $151/yr | saves $31 |
| A. O. Smith HPSN10-50H45DV 2 series | 46 gal | $151/yr | saves $31 |
| A. O. Smith HPTS-50 2 series | 46 gal | $151/yr | saves $31 |
Specs
| Brand | Rinnai |
| Model | REHP50BM |
| Type | 240-volt integrated |
| Energy use | 844 kWh / year |
| Federal maximum for this type | 3440 kWh / year |
| Size | 46 gal |
| Width | 21.7 in |
| Tank size | 46 gal |
| First-hour rating | 73 gal |
| Efficiency (UEF) | 3.75 |
| Usage pattern | Medium-Usage |
| Voltage | 240 |
| Tank height | 66.4 in |
| Tank diameter | 21.7 in |
| Noise | 49 dBA |
Specs and energy use from the ENERGY STAR certified products list (U.S. EPA). An asterisk in a model number stands for colour or finish codes. HouseholdLeak is not affiliated with ENERGY STAR or the EPA.
Questions people ask
How much does the Rinnai REHP50BM cost to run?
About $154 a year at the U.S. average electricity price (18.19¢/kWh), based on its ENERGY STAR rating of 844 kWh a year. In a state with expensive power it can be much more; pick your state on this page to see your number.
How much will the Rinnai REHP50BM cost in electricity over its life?
About $1,996 over 13 years, a typical life for a heat pump water heater. Add that to the price you pay to get the true cost to own.
Is the Rinnai REHP50BM energy efficient?
Yes. It is ENERGY STAR certified and uses 75% less electricity than a standard electric tank water heater.
Is there a cheaper water heater to run of the same type and size?
Yes. The GE Profile PH40S10BPY01 uses 773 kWh a year, about $168 less in electricity over 13 years.
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