Rheem ProTerra 50 Gal
#3 in 40–50 GallonFull review
A strong 240 V choice with Wi-Fi, widely stocked at Home Depot. GE Profile beats it on efficiency and noise.
Home Depot $1,699$1,699
The Rheem ProTerra 50 Gal and the Rinnai REHP50 are evenly matched, rated 3.7 and 3.6. The Rheem ProTerra 50 Gal leads on efficiency and noise. The Rinnai REHP50 wins on hot water. The Rheem ProTerra 50 Gal costs $100 less ($1,699 vs $1,799).
Rinnai REHP50
#4 in 40–50 GallonFull review
A Midea-built heater with Rinnai’s support network and one of the few listings on Amazon. Check the seller is a Rinnai-authorized dealer before buying.
Amazon $1,799 Lowe's $1,799$1,799
Prices were last checked October 21, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Rheem ProTerra 50 Gal for efficiency (3.88 UEF vs 3.75 UEF) and noise (45 dB(A) vs 49 dB(A)).
- Choose the Rinnai REHP50 for hot water (73 gallons in the first hour vs 67 gallons in the first hour).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 40–50 gallon heat pump water heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | Rheem ProTerra 50 Gal | Rinnai REHP50 |
|---|---|---|
| Overall rating | 3.7/5 | 3.6/5 |
| Efficiency 35% | 63 3.88 UEF | 54 3.75 UEF |
| Hot water 20% | 68 67 gallons in the first hour | 92 73 gallons in the first hour |
| Warranty 20% | 75 10-year tank, 10-year parts, 1-year labor | 75 10-year tank, 10-year parts, 1-year labor |
| Cold rooms 15% | 32 heat pump runs down to 37 °F room air | 30 heat pump runs down to 37.4 °F room air |
| Noise 10% | 69 45 dB(A) | 44 49 dB(A) |
Specifications
| Rheem ProTerra 50 Gal | Rinnai REHP50 | |
|---|---|---|
| Ratings (ENERGY STAR) | ||
| Size (nominal) | 50 gal | 50 gal |
| Tank volume (measured) | 45 gal | 46 gal |
| Uniform Energy Factor | 3.88 | 3.75 |
| First-hour rating | 67 gal | 73 gal |
| Draw pattern | Medium | Medium |
| Yearly energy use | 846 kWh | 844 kWh |
| Heat pump cut-off (low) | 37 °F | 37.4 °F |
| Sound level | 45 dB(A) | 49 dB(A) |
| ENERGY STAR ID | 3554202 | 3531243 |
| Installation | ||
| Power | 240 V | 240 V |
| Circuit | 30 A, 208/240 V | 30 A, 208/240 V |
| Backup element | 4,500 W | 4,500 W |
| Operating air range | 37 to 145 °F | 37 to 107 °F |
| Minimum room size | 700 cu ft | 700 cu ft |
| Size | 61.8 in tall, 22.3 in across | 66.4 in tall, 21.7 in across |
| Weight | 185 lb | 218 lb |
| Refrigerant | R-134a | R-134a |
| Features | ||
| Wi-Fi | Built in | No |
| App | EcoNet | - |
| Demand response port (CTA-2045) | Yes | - |
| Leak detection | No | No |
| Modes | Energy Saver, Heat Pump, High Demand, Electric, Vacation | Economy, Heat Pump, Hybrid, E-Heater, Vacation |
| Warranty and models | ||
| Warranty | 10 yr tank, 10 yr parts, 1 yr labor | 10 yr tank, 10 yr parts, 1 yr labor |
| Also sold as | Friedrich PROH50 T2 FD400-30, Friedrich PROH50 T2 FD400-SO, Rheem PROPH50 T2 RH375-30, Rheem PROPH50 T2 RH400-30, Rheem PROPH50 T2 RH400-SO, Richmond 10E50-HP530, Richmond 10E50-HP5U30, Richmond 10E50-HP5US30, Ruud PROUH50 T2 RU375-30, Ruud PROUH50 T2 RU375-SO, Ruud PROUH50 T2 RU400-30, Ruud PROUH50 T2 RU400-SO | - |
| Released | 2024-06 | 2024-08 |