Both are heat pump water heaters. The PROPH50 T2 RH400-30 is more efficient (UEF 3.88 vs 3.80). The HPTS-50-2 saves $3/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 | HPTS-50-2 A. O. Smith · Heat Pump | PROPH50 T2 RH400-30 Rheem · Heat Pump |
|---|---|---|
| UEF | 3.80 | 3.88Difference: 0.08 |
| Capacity | 46 galDifference: 1 gal | 45 gal |
| First Hour Rating | 65 gal | 67 galDifference: 2 gal |
| kW Input | 4.50 kWidentical | |
The PROPH50 T2 RH400-30 leads on efficiency. But does it fit? Sizing guide
Physical dimensions
| Dimension | HPTS-50-2 | PROPH50 T2 RH400-30 |
|---|---|---|
| Height | 63" | 61.75"Difference: 1.25" |
| Width | 22"Difference: 0.25" | 22.25" |
| Depth | 22"Difference: 0.50" | 22.50" |
| Weight | — | 185 lbs |
Fit checked. Now the operating cost.
Operating cost
| Cost | HPTS-50-2 | PROPH50 T2 RH400-30 |
|---|---|---|
| Annual Operating Cost | $143/yrDifference: $3/yr | $146/yr |
| 10-Year Operating Cost | $1,430Difference: $30 | $1,460 |
| Annual Energy | 831 kWhDifference: 15 kWh | 846 kWh |
10-year modeled difference is $30. At this scale, local energy rates, usage patterns, and install costs matter more than the efficiency delta.
Costs vary by state. The HPTS-50-2 ranges from $92/yr (ND) to $346/yr (HI). The PROPH50 T2 RH400-30 ranges from $93/yr (ND) to $352/yr (HI).
$3/yr separates them. Install requirements determine the upfront gap. Installation accessories
Installation requirements
| Requirement | HPTS-50-2 | PROPH50 T2 RH400-30 |
|---|---|---|
| Voltage | 240Videntical | |
| Amperage | 22A | 21ADifference: 1A |
| Breaker | 30Aidentical | |
| Condensate Drain | Yesidentical | |
Same electrical requirements. Swapping between these units should not require electrical changes.
Warranty
| Coverage | HPTS-50-2 | PROPH50 T2 RH400-30 |
|---|---|---|
| Tank | 10 yridentical | |
| Parts | — | 10 yr |
Features
| Feature | HPTS-50-2 | PROPH50 T2 RH400-30 |
|---|---|---|
| Wi-Fi / Smart | Yesidentical | |
| Noise Level | 45 dB | — |
| Refrigerant | R-134aidentical | |
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