Both are heat pump water heaters. The PROPH50 T2 RH400-30 is more efficient (UEF 3.88 vs 3.46). The PROPH50 T2 RH400-30 saves $16/year to operate. All figures from published specs and EIA energy prices.
Performance
| Spec | NHP50 Noritz · Heat Pump | PROPH50 T2 RH400-30 Rheem · Heat Pump |
|---|---|---|
| UEF | 3.46 | 3.88Difference: 0.42 |
| Capacity | 47 galDifference: 2 gal | 45 gal |
| First Hour Rating | 58 gal | 67 galDifference: 9 gal |
| kW Input | 4.50 kWidentical | |
The PROPH50 T2 RH400-30 leads on efficiency. But does it fit? Sizing guide
Physical dimensions
| Dimension | NHP50 | PROPH50 T2 RH400-30 |
|---|---|---|
| Height | 58.30"Difference: 3.45" | 61.75" |
| Width | 28" | 22.25"Difference: 5.75" |
| Depth | 28" | 22.50"Difference: 5.50" |
| Weight | — | 185 lbs |
The PROPH50 T2 RH400-30 is taller. Fit checked. Now the operating cost.
Operating cost
| Cost | NHP50 | PROPH50 T2 RH400-30 |
|---|---|---|
| Annual Operating Cost | $162/yr | $146/yrDifference: $16/yr |
| 10-Year Operating Cost | $1,620 | $1,460Difference: $160 |
| Annual Energy | 938 kWh | 846 kWhDifference: 92 kWh |
10-year modeled difference is $160. At this scale, local energy rates, usage patterns, and install costs matter more than the efficiency delta.
Costs vary by state. The NHP50 ranges from $103/yr (ND) to $390/yr (HI). The PROPH50 T2 RH400-30 ranges from $93/yr (ND) to $352/yr (HI).
$16/yr separates them. Install requirements determine the upfront gap. Installation accessories
Installation requirements
| Requirement | NHP50 | PROPH50 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 | NHP50 | PROPH50 T2 RH400-30 |
|---|---|---|
| Tank | 10 yridentical | |
| Parts | — | 10 yr |
Features
| Feature | NHP50 | PROPH50 T2 RH400-30 |
|---|---|---|
| Wi-Fi / Smart | — | Yes |
| Noise Level | 54 dB | — |
| Refrigerant | R-134aidentical | |
Decision split
Pick this one if...
Noritz NHP50
- Your ceiling or space is under 61.75"
Pick this one if...
Rheem PROPH50 T2 RH400-30
- Minimizing energy cost matters (saves $16/yr)
- You want smart home / Wi-Fi control
- Peak efficiency is the priority (UEF 3.88)
- You have high peak demand (67 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