Both are heat pump water heaters. The PROPH80 T2 RH400-30 is more efficient (UEF 4.07 vs 4). The PROPH80 T2 RH400-30 saves $2/year to operate. All figures from published specs and EIA energy prices.
Performance
| Spec | PROPH80 T2 RH400-30 Rheem · Heat Pump | REHP80BM Rinnai · Heat Pump |
|---|---|---|
| UEF | 4.07Difference: 0.07 | 4 |
| Capacity | 72 gal | 75 galDifference: 3 gal |
| First Hour Rating | 87 gal | 91 galDifference: 4 gal |
| kW Input | 4.50 kWDifference: 0.40 kW | 4.90 kW |
The PROPH80 T2 RH400-30 leads on efficiency. But does it fit? Sizing guide
Physical dimensions
| Dimension | PROPH80 T2 RH400-30 | REHP80BM |
|---|---|---|
| Height | 74.19"Difference: 0.01" | 74.20" |
| Width | 24.25"Difference: 1.35" | 25.60" |
| Depth | 24.62"Difference: 1.07" | 25.69" |
| Weight | 261 lbsDifference: 9 lbs | 270 lbs |
Fit checked. Now the operating cost.
Operating cost
| Cost | PROPH80 T2 RH400-30 | REHP80BM |
|---|---|---|
| Annual Operating Cost | $209/yrDifference: $2/yr | $211/yr |
| 10-Year Operating Cost | $2,090Difference: $20 | $2,110 |
| Annual Energy | 1,213 kWhDifference: 12 kWh | 1,225 kWh |
10-year modeled difference is $20. At this scale, local energy rates, usage patterns, and install costs matter more than the efficiency delta.
Costs vary by state. The PROPH80 T2 RH400-30 ranges from $134/yr (ND) to $505/yr (HI). The REHP80BM ranges from $135/yr (ND) to $510/yr (HI).
$2/yr separates them. Install requirements determine the upfront gap. Installation accessories
Installation requirements
| Requirement | PROPH80 T2 RH400-30 | REHP80BM |
|---|---|---|
| Voltage | 240Videntical | |
| Amperage | 21ADifference: 3A | 24A |
| Breaker | 30Aidentical | |
Same electrical requirements. Swapping between these units should not require electrical changes.
Warranty
| Coverage | PROPH80 T2 RH400-30 | REHP80BM |
|---|---|---|
| Tank | 10 yridentical | |
| Parts | 10 yridentical | |
| Labor | — | 1 yr |
Features
| Feature | PROPH80 T2 RH400-30 | REHP80BM |
|---|---|---|
| Wi-Fi / Smart | Yesidentical | |
| 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