A.O. Smith Voltex PHPT 50 vs Rheem Proterra PROPH50 T2 RH350
Verdict: The Rheem Proterra PROPH50 T2 RH350 wins on efficiency with a 3.50 UEF versus 3.45 on the A.O. Smith Voltex PHPT 50 and a 67-gallon first-hour rating per manufacturer specs. Both models share identical 50-gallon capacity and 10-year warranties, but the Rheem pulls ahead in DOE energy cost savings estimates. Consumer Reports notes comparable noise levels and installation needs for these two 50-gallon heat pump units.
Winner: Rheem Proterra PROPH50 T2 RH350
A.O. Smith Voltex PHPT 50: 8/10
Rheem Proterra PROPH50 T2 RH350: 8.5/10
Spec-by-spec comparison
| A.O. Smith Voltex PHPT 50 | Rheem Proterra PROPH50 T2 RH350 | |
|---|---|---|
| Capacity | 50 gallons | 50 gallons |
| Uniform Energy Factor | 3.45 | 3.50 |
| First Hour Rating | 65 gallons | 67 gallons |
| Warranty | 10 years limited | 10 years limited |
A.O. Smith Voltex PHPT 50
What works
- UEF 3.45 reduces annual energy cost by ~$300 vs electric resistance (per DOE estimates)
- First hour rating of 65 gallons supports 3-4 person households
- 10-year limited warranty on tank and parts
What doesn't
- Requires 750 cubic feet of air space for optimal efficiency
- Higher upfront cost than standard electric models
Rheem Proterra PROPH50 T2 RH350
What works
- UEF 3.50 delivers slightly lower operating costs than most competitors
- First hour rating of 67 gallons handles peak demand for 3-4 people
- 10-year limited warranty on tank and parts
What doesn't
- Needs adequate airflow clearance similar to other heat pump models
- Louder compressor than some premium alternatives during recovery
Bottom line
Our pick: Rheem Proterra PROPH50 T2 RH350.
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