Both are heat pump water heaters. The PROPH80 T2 RH400-30 is more efficient (UEF 4.07 vs 3.48). The PROPH80 T2 RH400-30 saves $36/year to operate. All figures from published specs and EIA energy prices.
Performance
| Spec | NHP80 Noritz · Heat Pump | PROPH80 T2 RH400-30 Rheem · Heat Pump |
|---|---|---|
| UEF | 3.48 | 4.07Difference: 0.59 |
| Capacity | 74 galDifference: 2 gal | 72 gal |
| First Hour Rating | 86 gal | 87 galDifference: 1 gal |
| kW Input | 4.50 kWidentical | |
The PROPH80 T2 RH400-30 leads on efficiency. But does it fit? Sizing guide
Physical dimensions
| Dimension | NHP80 | PROPH80 T2 RH400-30 |
|---|---|---|
| Height | 74"Difference: 0.19" | 74.19" |
| Width | 28" | 24.25"Difference: 3.75" |
| Depth | 28" | 24.62"Difference: 3.38" |
| Weight | — | 261 lbs |
Fit checked. Now the operating cost.
Operating cost
| Cost | NHP80 | PROPH80 T2 RH400-30 |
|---|---|---|
| Annual Operating Cost | $245/yr | $209/yrDifference: $36/yr |
| 10-Year Operating Cost | $2,450 | $2,090Difference: $360 |
| Annual Energy | 1,424 kWh | 1,213 kWhDifference: 211 kWh |
10-year difference: $360 in favor of the PROPH80 T2 RH400-30, 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 PROPH80 T2 RH400-30 ranges from $134/yr (ND) to $505/yr (HI).
$36/yr separates them. Install requirements determine the upfront gap. Installation accessories
Installation requirements
| Requirement | NHP80 | PROPH80 T2 RH400-30 |
|---|---|---|
| Voltage | 240Videntical | |
| Amperage | 23A | 21ADifference: 2A |
| Breaker | 30Aidentical | |
| Condensate Drain | Yes | — |
Same electrical requirements. Swapping between these units should not require electrical changes.
Warranty
| Coverage | NHP80 | PROPH80 T2 RH400-30 |
|---|---|---|
| Tank | 10 yridentical | |
| Parts | 10 yridentical | |
| Labor | 1 yr | — |
Features
| Feature | NHP80 | PROPH80 T2 RH400-30 |
|---|---|---|
| Wi-Fi / Smart | No | Yes |
| Noise Level | 54 dB | — |
| Refrigerant | R-134aidentical | |
Decision split
Pick this one if...
Rheem PROPH80 T2 RH400-30
- Minimizing energy cost matters (saves $36/yr)
- You want smart home / Wi-Fi control
- Peak efficiency is the priority (UEF 4.07)
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