Both are heat pump water heaters. The NWP500S080AUMB is more efficient (UEF 4.05 vs 3.59). The NWP500S080AUMB saves $20/year to operate. All figures from published specs and EIA energy prices.
Performance
| Spec | RE2H80T Bradford White · Heat Pump | NWP500S080AUMB Navien · Heat Pump |
|---|---|---|
| UEF | 3.59 | 4.05Difference: 0.46 |
| Capacity | 75 galDifference: 1 gal | 74 gal |
| First Hour Rating | 88 galDifference: 3 gal | 85 gal |
| kW Input | 4.50 kWDifference: 0.50 kW | 5 kW |
The NWP500S080AUMB leads on efficiency. But does it fit? Sizing guide
Physical dimensions
| Dimension | RE2H80T | NWP500S080AUMB |
|---|---|---|
| Height | 70.81"Difference: 0.79" | 71.60" |
| Width | 25"identical | |
| Depth | 25"identical | |
| Weight | — | 220 lbs |
Fit checked. Now the operating cost.
Operating cost
| Cost | RE2H80T | NWP500S080AUMB |
|---|---|---|
| Annual Operating Cost | $238/yr | $218/yrDifference: $20/yr |
| 10-Year Operating Cost | $2,380 | $2,180Difference: $200 |
| Annual Energy | 1,382 kWh | 1,265 kWhDifference: 117 kWh |
10-year difference: $200 in favor of the NWP500S080AUMB, at current US average energy rates. Actual savings depend on local rates and usage patterns.
Costs vary by state. The RE2H80T ranges from $152/yr (ND) to $575/yr (HI). The NWP500S080AUMB ranges from $139/yr (ND) to $526/yr (HI).
$20/yr separates them. Install requirements determine the upfront gap. Installation accessories
Installation requirements
| Requirement | RE2H80T | NWP500S080AUMB |
|---|---|---|
| Voltage | 240Videntical | |
| Amperage | 19ADifference: 4A | 23A |
| Breaker | 30Aidentical | |
| Condensate Drain | — | Yes |
Same electrical requirements. Swapping between these units should not require electrical changes.
Warranty
| Coverage | RE2H80T | NWP500S080AUMB |
|---|---|---|
| Tank | 10 yridentical | |
| Parts | — | 10 yr |
| Labor | — | 1 yr |
Features
| Feature | RE2H80T | NWP500S080AUMB |
|---|---|---|
| Wi-Fi / Smart | — | Yes |
| Noise Level | — | 45 dB |
| Refrigerant | R-134aidentical | |
Decision split
Pick this one if...
Navien NWP500S080AUMB
- Minimizing energy cost matters (saves $20/yr)
- You want smart home / Wi-Fi control
- Peak efficiency is the priority (UEF 4.05)
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