Navien NWP500 65 Gal
#5 in 65 GallonFull review
Navien’s stainless-tank hybrid, sold through plumbers, with a 10-year warranty that includes a year of labor. Its heat pump stops below 41 °F room air, so it suits a basement more than a cold garage.
The Navien NWP500 65 Gal is the better heat pump water heater overall, rated 3.7 to 2.9. The Navien NWP500 65 Gal leads on hot water and efficiency. The Rheem ProTerra 15 A 65 Gal wins on cold rooms.
Rheem ProTerra 15 A 65 Gal
#15 in 65 GallonFull review
The ProTerra for a home that only has a 15 A, 240 V circuit, such as one left by a small electric tank: it avoids rewiring but gives up some efficiency and first-hour delivery.
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 Navien NWP500 65 Gal for hot water (80 gallons in the first hour vs 54 gallons in the first hour) and efficiency (4.03 UEF vs 3.55 UEF).
- Choose the Rheem ProTerra 15 A 65 Gal for cold rooms (heat pump runs down to 37 °F room air vs heat pump runs down to 41 °F room air).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 65 gallon heat pump water heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | Navien NWP500 65 Gal | Rheem ProTerra 15 A 65 Gal |
|---|---|---|
| Overall rating | 3.7/5 | 2.9/5 |
| Efficiency 35% | 74 4.03 UEF | 39 3.55 UEF |
| Hot water 20% | 80 80 gallons in the first hour | 0 54 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% | 16 heat pump runs down to 41 °F room air | 32 heat pump runs down to 37 °F room air |
| Noise 10% | 50 noise not published (neutral score used) | 69 45 dB(A) |
Specifications
| Navien NWP500 65 Gal | Rheem ProTerra 15 A 65 Gal | |
|---|---|---|
| Ratings (ENERGY STAR) | ||
| Size (nominal) | 65 gal | 65 gal |
| Tank volume (measured) | 61 gal | 59 gal |
| Uniform Energy Factor | 4.03 | 3.55 |
| First-hour rating | 80 gal | 54 gal |
| Draw pattern | High | Medium |
| Yearly energy use | 1,245 kWh | 887 kWh |
| Heat pump cut-off (low) | 41 °F | 37 °F |
| Sound level | - | 45 dB(A) |
| ENERGY STAR ID | 4015937 | 3554213 |
| Installation | ||
| Power | 240 V | 240 V |
| Circuit | 30 A, 208/240 V | 15 A, 208/240 V |
| Backup element | 5,000 W | 2,250 W |
| Operating air range | 41 to 113 °F | 37 to 145 °F |
| Minimum room size | 640 cu ft | 700 cu ft |
| Size | 63 in tall, 25 in across | 64.2 in tall, 24.3 in across |
| Weight | 204 lb | 245 lb |
| Refrigerant | R-134a | R-134a |
| Features | ||
| Wi-Fi | Built in | Built in |
| App | NaviLink | EcoNet |
| Demand response port (CTA-2045) | - | Yes |
| Leak detection | No | No |
| Modes | Energy Saver, Heat Pump, High Demand, Electric, Vacation | Energy Saver, Heat Pump, High Demand, Electric, 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 PROH65 T2 FD400-15, Rheem PROPH65 T2 RH375-15, Rheem PROPH65 T2 RH400-15, Richmond 10E65-HP515, Richmond 10E65-HP5U15, Ruud PROUH65 T2 RU375-15, Ruud PROUH65 T2 RU400-15 |
| Released | 2025-06 | 2024-06 |