Both are heat pump water heaters. The RE2HP50-1NCTT is more efficient (UEF 3.89 vs 3.68). The RE2HP50-1NCTT saves $8/year to operate. All figures from published specs and EIA energy prices.
Performance
| Spec | HPTA-50-2 A. O. Smith · Heat Pump | RE2HP50-1NCTT Bradford White · Heat Pump |
|---|---|---|
| UEF | 3.68 | 3.89Difference: 0.21 |
| Capacity | 46 galDifference: 1 gal | 45 gal |
| First Hour Rating | 65 galidentical | |
| kW Input | 4.50 kWDifference: 0.10 kW | 4.60 kW |
The RE2HP50-1NCTT leads on efficiency. But does it fit? Sizing guide
Physical dimensions
| Dimension | HPTA-50-2 | RE2HP50-1NCTT |
|---|---|---|
| Height | 63" | 46.10"Difference: 16.90" |
| Width | 15"Difference: 3" | 18" |
| Weight | 196 lbsDifference: 22 lbs | 218 lbs |
The HPTA-50-2 is taller. Fit checked. Now the operating cost.
Operating cost
| Cost | HPTA-50-2 | RE2HP50-1NCTT |
|---|---|---|
| Annual Operating Cost | $152/yr | $144/yrDifference: $8/yr |
| 10-Year Operating Cost | $1,520 | $1,440Difference: $80 |
| Annual Energy | 883 kWh | 835 kWhDifference: 48 kWh |
10-year modeled difference is $80. At this scale, local energy rates, usage patterns, and install costs matter more than the efficiency delta.
Costs vary by state. The HPTA-50-2 ranges from $97/yr (ND) to $368/yr (HI). The RE2HP50-1NCTT ranges from $92/yr (ND) to $348/yr (HI).
$8/yr separates them. Install requirements determine the upfront gap. Installation accessories
Installation requirements
| Requirement | HPTA-50-2 | RE2HP50-1NCTT |
|---|---|---|
| Voltage | 240Videntical | |
| Amperage | 22A | 19ADifference: 3A |
| Breaker | 30A | — |
Same electrical requirements. Swapping between these units should not require electrical changes.
Warranty
| Coverage | HPTA-50-2 | RE2HP50-1NCTT |
|---|---|---|
| Tank | 10 yridentical | |
Features
| Feature | HPTA-50-2 | RE2HP50-1NCTT |
|---|---|---|
| Refrigerant | R-134aidentical | |
Decision split
Pick this one if...
Bradford White RE2HP50-1NCTT
- Your ceiling or space is under 63"
- Peak efficiency is the priority (UEF 3.89)
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