Both are heat pump water heaters. The PROPH50 T2 RH400-30 is more efficient (UEF 3.88 vs 3.75). All figures from published specs and EIA energy prices.
Performance
| Spec | PROPH50 T2 RH400-30 Rheem · Heat Pump | REHP50BM Rinnai · Heat Pump |
|---|---|---|
| UEF | 3.88Difference: 0.13 | 3.75 |
| Capacity | 45 gal | 46 galDifference: 1 gal |
| First Hour Rating | 67 gal | 73 galDifference: 6 gal |
| kW Input | 4.50 kWDifference: 0.40 kW | 4.90 kW |
The PROPH50 T2 RH400-30 leads on efficiency. But does it fit? Sizing guide
Physical dimensions
| Dimension | PROPH50 T2 RH400-30 | REHP50BM |
|---|---|---|
| Height | 61.75"Difference: 4.65" | 66.40" |
| Width | 22.25" | 21.70"Difference: 0.55" |
| Depth | 22.50" | 22"Difference: 0.50" |
| Weight | 185 lbsDifference: 27 lbs | 212 lbs |
The REHP50BM is taller. Fit checked. Now the operating cost.
Operating cost
| Cost | PROPH50 T2 RH400-30 | REHP50BM |
|---|---|---|
| Annual Operating Cost | $146/yridentical | |
| 10-Year Operating Cost | $1,460identical | |
| Annual Energy | 846 kWh | 844 kWhDifference: 2 kWh |
Costs vary by state. The PROPH50 T2 RH400-30 ranges from $93/yr (ND) to $352/yr (HI). The REHP50BM ranges from $93/yr (ND) to $351/yr (HI).
Install requirements determine the upfront gap. Installation accessories
Installation requirements
| Requirement | PROPH50 T2 RH400-30 | REHP50BM |
|---|---|---|
| Voltage | 240Videntical | |
| Amperage | 21ADifference: 3A | 24A |
| Breaker | 30Aidentical | |
| Condensate Drain | Yesidentical | |
Same electrical requirements. Swapping between these units should not require electrical changes.
Warranty
| Coverage | PROPH50 T2 RH400-30 | REHP50BM |
|---|---|---|
| Tank | 10 yridentical | |
| Parts | 10 yridentical | |
| Labor | — | 1 yr |
Features
| Feature | PROPH50 T2 RH400-30 | REHP50BM |
|---|---|---|
| Wi-Fi / Smart | Yesidentical | |
| Refrigerant | R-134aidentical | |
Decision split
Pick this one if...
Rheem PROPH50 T2 RH400-30
- Your ceiling or space is under 66.40"
- Peak efficiency is the priority (UEF 3.88)
Pick this one if...
Rinnai REHP50BM
- You have high peak demand (73 gal FHR)
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