Both are heat pump water heaters. Efficiency is nearly identical. The NHP50 saves $1/year to operate. All figures from published specs and EIA energy prices.
Performance
| Spec | RE2H50S Bradford White · Heat Pump | NHP50 Noritz · Heat Pump |
|---|---|---|
| UEF | 3.44 | 3.46Difference: 0.02 |
| Capacity | 45 gal | 47 galDifference: 2 gal |
| First Hour Rating | 65 galDifference: 7 gal | 58 gal |
| kW Input | 4.50 kWidentical | |
But does it fit? Sizing guide
Physical dimensions
| Dimension | RE2H50S | NHP50 |
|---|---|---|
| Height | 59.19" | 58.30"Difference: 0.89" |
| Width | 21.75"Difference: 6.25" | 28" |
| Depth | 21.75"Difference: 6.25" | 28" |
Fit checked. Now the operating cost.
Operating cost
| Cost | RE2H50S | NHP50 |
|---|---|---|
| Annual Operating Cost | $163/yr | $162/yrDifference: $1/yr |
| 10-Year Operating Cost | $1,630 | $1,620Difference: $10 |
| Annual Energy | 944 kWh | 938 kWhDifference: 6 kWh |
10-year modeled difference is $10. At this scale, local energy rates, usage patterns, and install costs matter more than the efficiency delta.
Costs vary by state. The RE2H50S ranges from $104/yr (ND) to $393/yr (HI). The NHP50 ranges from $103/yr (ND) to $390/yr (HI).
$1/yr separates them. Install requirements determine the upfront gap. Installation accessories
Installation requirements
| Requirement | RE2H50S | NHP50 |
|---|---|---|
| Voltage | 240Videntical | |
| Amperage | 19ADifference: 4A | 23A |
| Breaker | 30Aidentical | |
Same electrical requirements. Swapping between these units should not require electrical changes.
Warranty
| Coverage | RE2H50S | NHP50 |
|---|---|---|
| Tank | 10 yridentical | |
Features
| Feature | RE2H50S | NHP50 |
|---|---|---|
| Noise Level | — | 54 dB |
| Refrigerant | R-134aidentical | |
Decision split
Pick this one if...
Bradford White RE2H50S
- You have high peak demand (65 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