Both are 60-gallon heat pump water heaters. Efficiency is nearly identical. All figures from published specs and EIA energy prices.
Performance
| Spec | REHP65BM Rinnai · Heat Pump | REHP65C Rinnai · Heat Pump |
|---|---|---|
| UEF | 3.90identical | |
| Capacity | 60 galidentical | |
| First Hour Rating | 80 galidentical | |
| kW Input | 5.50 kWidentical | |
But does it fit? Sizing guide
Physical dimensions
| Dimension | REHP65BM | REHP65C |
|---|---|---|
| Height | 65.50" | 45.50"Difference: 20" |
| Width | 25.60" | 21.80"Difference: 3.80" |
| Depth | 25.69" | — |
| Weight | 250 lbs | — |
The REHP65BM is taller. Fit checked. Now the operating cost.
Operating cost
| Cost | REHP65BM | REHP65C |
|---|---|---|
| Annual Operating Cost | $214/yridentical | |
| 10-Year Operating Cost | $2,140identical | |
| Annual Energy | 1,240 kWhidentical | |
Costs vary by state. The REHP65BM ranges from $137/yr (ND) to $516/yr (HI). The REHP65C ranges from $137/yr (ND) to $516/yr (HI).
Install requirements determine the upfront gap. Installation accessories
Installation requirements
| Requirement | REHP65BM | REHP65C |
|---|---|---|
| Voltage | 240Videntical | |
| Amperage | 24Aidentical | |
| Breaker | 30A | — |
Same electrical requirements. Swapping between these units should not require electrical changes.
Warranty
| Coverage | REHP65BM | REHP65C |
|---|---|---|
| Tank | 10 yridentical | |
| Parts | 10 yridentical | |
| Labor | 1 yridentical | |
Features
| Feature | REHP65BM | REHP65C |
|---|---|---|
| Wi-Fi / Smart | Yes | — |
| Refrigerant | R-134aidentical | |
Decision split
Pick this one if...
Rinnai REHP65BM
- You want smart home / Wi-Fi control
Pick this one if...
Rinnai REHP65C
- Your ceiling or space is under 65.50"
Neither if...
- Your home only has 120V service and you cannot upgrade the panel
- Your install space is under 700 sq ft of open air
Common accessories for this type of installation.
Common install considerations for heat pump units
What is required depends on your existing installation, local code, and installer preference.
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Related
Sources. ENERGY STAR, manufacturer spec sheets, EIA average energy prices.Methodology