Both are heat pump water heaters. The HPTS-80-2 is more efficient (UEF 3.88 vs 3.48). The HPTS-80-2 saves $25/year to operate. All figures from published specs and EIA energy prices.
Performance
| Spec | HPTS-80-2 A. O. Smith · Heat Pump | NHP80 Noritz · Heat Pump |
|---|---|---|
| UEF | 3.88Difference: 0.40 | 3.48 |
| Capacity | 82 galDifference: 8 gal | 74 gal |
| First Hour Rating | 95 galDifference: 9 gal | 86 gal |
| kW Input | 4.50 kWidentical | |
The HPTS-80-2 leads on efficiency. But does it fit? Sizing guide
Physical dimensions
| Dimension | HPTS-80-2 | NHP80 |
|---|---|---|
| Height | 69"Difference: 5" | 74" |
| Width | 26.50"Difference: 1.50" | 28" |
| Depth | 26.50"Difference: 1.50" | 28" |
The NHP80 is taller. Fit checked. Now the operating cost.
Operating cost
| Cost | HPTS-80-2 | NHP80 |
|---|---|---|
| Annual Operating Cost | $220/yrDifference: $25/yr | $245/yr |
| 10-Year Operating Cost | $2,200Difference: $250 | $2,450 |
| Annual Energy | 1,279 kWhDifference: 145 kWh | 1,424 kWh |
10-year difference: $250 in favor of the HPTS-80-2, at current US average energy rates. Actual savings depend on local rates and usage patterns.
Costs vary by state. The HPTS-80-2 ranges from $141/yr (ND) to $532/yr (HI). The NHP80 ranges from $157/yr (ND) to $593/yr (HI).
$25/yr separates them. Install requirements determine the upfront gap. Installation accessories
Installation requirements
| Requirement | HPTS-80-2 | NHP80 |
|---|---|---|
| Voltage | 240Videntical | |
| Amperage | 22ADifference: 1A | 23A |
| Breaker | 30Aidentical | |
| Condensate Drain | Yesidentical | |
Same electrical requirements. Swapping between these units should not require electrical changes.
Warranty
| Coverage | HPTS-80-2 | NHP80 |
|---|---|---|
| Tank | 10 yridentical | |
| Parts | — | 10 yr |
| Labor | — | 1 yr |
Features
| Feature | HPTS-80-2 | NHP80 |
|---|---|---|
| Wi-Fi / Smart | Yes | No |
| Noise Level | 45 dBDifference: 9 dB | 54 dB |
| Refrigerant | R-134aidentical | |
Decision split
Pick this one if...
A. O. Smith HPTS-80-2
- Your ceiling or space is under 74"
- Minimizing energy cost matters (saves $25/yr)
- You need quiet operation (45 dB vs 54 dB)
- You want smart home / Wi-Fi control
Neither if...
- You have no floor drain and cannot add condensate handling
- 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