Both are heat pump water heaters. The PROPH65 T2 RH400-30 is more efficient (UEF 4.05 vs 3.34). The NHP65 saves $36/year to operate. All figures from published specs and EIA energy prices. UEF measures lab efficiency under DOE test conditions. Annual cost uses that rating plus national average energy prices. Different draw patterns, local rates, and standby losses can cause the rankings to diverge.
Performance
| Spec | NHP65 Noritz · Heat Pump | PROPH65 T2 RH400-30 Rheem · Heat Pump |
|---|---|---|
| UEF | 3.34 | 4.05Difference: 0.71 |
| Capacity | 57 gal | 59 galDifference: 2 gal |
| First Hour Rating | 70 gal | 75 galDifference: 5 gal |
| kW Input | 4.50 kWidentical | |
The PROPH65 T2 RH400-30 leads on efficiency. But does it fit? Sizing guide
Physical dimensions
| Dimension | NHP65 | PROPH65 T2 RH400-30 |
|---|---|---|
| Height | 63.80"Difference: 0.39" | 64.19" |
| Width | 28" | 24.25"Difference: 3.75" |
| Depth | 28" | 24.62"Difference: 3.38" |
| Weight | — | 245 lbs |
Fit checked. Now the operating cost.
Operating cost
| Cost | NHP65 | PROPH65 T2 RH400-30 |
|---|---|---|
| Annual Operating Cost | $168/yrDifference: $36/yr | $204/yr |
| 10-Year Operating Cost | $1,680Difference: $360 | $2,040 |
| Annual Energy | 974 kWhDifference: 210 kWh | 1,184 kWh |
10-year difference: $360 in favor of the NHP65, at current US average energy rates. Actual savings depend on local rates and usage patterns.
Costs vary by state. The NHP65 ranges from $107/yr (ND) to $405/yr (HI). The PROPH65 T2 RH400-30 ranges from $130/yr (ND) to $493/yr (HI).
$36/yr separates them. Install requirements determine the upfront gap. Installation accessories
Installation requirements
| Requirement | NHP65 | PROPH65 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 | NHP65 | PROPH65 T2 RH400-30 |
|---|---|---|
| Tank | 10 yridentical | |
| Parts | 10 yridentical | |
| Labor | 1 yr | — |
Features
| Feature | NHP65 | PROPH65 T2 RH400-30 |
|---|---|---|
| Wi-Fi / Smart | No | Yes |
| Noise Level | 54 dB | — |
| Refrigerant | R-134aidentical | |
Decision split
Pick this one if...
Noritz NHP65
- Minimizing energy cost matters (saves $36/yr)
Pick this one if...
Rheem PROPH65 T2 RH400-30
- You want smart home / Wi-Fi control
- Peak efficiency is the priority (UEF 4.05)
- You have high peak demand (75 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