Both are heat pump water heaters. The REHP80BM is more efficient (UEF 4 vs 3.48). The REHP80BM saves $34/year to operate. All figures from published specs and EIA energy prices.
Performance
| Spec | NHP80 Noritz · Heat Pump | REHP80BM Rinnai · Heat Pump |
|---|---|---|
| UEF | 3.48 | 4Difference: 0.52 |
| Capacity | 74 gal | 75 galDifference: 1 gal |
| First Hour Rating | 86 gal | 91 galDifference: 5 gal |
| kW Input | 4.50 kWDifference: 0.40 kW | 4.90 kW |
The REHP80BM leads on efficiency. But does it fit? Sizing guide
Physical dimensions
| Dimension | NHP80 | REHP80BM |
|---|---|---|
| Height | 74"Difference: 0.20" | 74.20" |
| Width | 28" | 25.60"Difference: 2.40" |
| Depth | 28" | 25.69"Difference: 2.31" |
| Weight | — | 270 lbs |
Fit checked. Now the operating cost.
Operating cost
| Cost | NHP80 | REHP80BM |
|---|---|---|
| Annual Operating Cost | $245/yr | $211/yrDifference: $34/yr |
| 10-Year Operating Cost | $2,450 | $2,110Difference: $340 |
| Annual Energy | 1,424 kWh | 1,225 kWhDifference: 199 kWh |
10-year difference: $340 in favor of the REHP80BM, at current US average energy rates. Actual savings depend on local rates and usage patterns.
Costs vary by state. The NHP80 ranges from $157/yr (ND) to $593/yr (HI). The REHP80BM ranges from $135/yr (ND) to $510/yr (HI).
$34/yr separates them. Install requirements determine the upfront gap. Installation accessories
Installation requirements
| Requirement | NHP80 | REHP80BM |
|---|---|---|
| Voltage | 240Videntical | |
| Amperage | 23ADifference: 1A | 24A |
| Breaker | 30Aidentical | |
| Condensate Drain | Yes | — |
Same electrical requirements. Swapping between these units should not require electrical changes.
Warranty
| Coverage | NHP80 | REHP80BM |
|---|---|---|
| Tank | 10 yridentical | |
| Parts | 10 yridentical | |
| Labor | 1 yridentical | |
Features
| Feature | NHP80 | REHP80BM |
|---|---|---|
| Wi-Fi / Smart | No | Yes |
| Noise Level | 54 dB | — |
| Refrigerant | R-134aidentical | |
Decision split
Pick this one if...
Rinnai REHP80BM
- Minimizing energy cost matters (saves $34/yr)
- You want smart home / Wi-Fi control
- Peak efficiency is the priority (UEF 4)
- You have high peak demand (91 gal FHR)
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