Navien NWP500 65 Gal
#4 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 3.8 to 3.7. The Navien NWP500 65 Gal leads on efficiency and noise. The Rinnai REHP65 wins on cold rooms.
Rinnai REHP65
#8 in 65 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 $1,657.02$1,657.02
Prices were last checked October 22, 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 efficiency (4.03 UEF vs 3.90 UEF) and noise (45 dB(A) vs 49 dB(A)).
- Choose the Rinnai REHP65 for cold rooms (heat pump runs down to 37.4 °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 | Rinnai REHP65 |
|---|---|---|
| Overall rating | 3.8/5 | 3.7/5 |
| Efficiency 35% | 74 4.03 UEF | 64 3.90 UEF |
| Hot water 20% | 80 80 gallons in the first hour | 80 80 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 | 30 heat pump runs down to 37.4 °F room air |
| Noise 10% | 69 45 dB(A) | 44 49 dB(A) |
Specifications
| Navien NWP500 65 Gal | Rinnai REHP65 | |
|---|---|---|
| Ratings (ENERGY STAR) | ||
| Size (nominal) | 65 gal | 65 gal |
| Tank volume (measured) | 61 gal | 60 gal |
| Uniform Energy Factor | 4.03 | 3.90 |
| First-hour rating | 80 gal | 80 gal |
| Draw pattern | High | High |
| Yearly energy use | 1,245 kWh | 1,240 kWh |
| Heat pump cut-off (low) | 41 °F | 37.4 °F |
| Sound level | 45 dB(A) | 49 dB(A) |
| ENERGY STAR ID | 4015937 | 3722797 |
| Installation | ||
| Power | 240 V | 240 V |
| Circuit | 30 A, 208/240 V | 30 A, 208/240 V |
| Backup element | 5,000 W | 4,500 W |
| Operating air range | 41 to 113 °F | 37 to 107 °F |
| Minimum room size | 640 cu ft | 700 cu ft |
| Size | 63 in tall, 25 in across | 45.5 in tall, 21.8 in across |
| Weight | 204 lb | 271 lb |
| Refrigerant | R-134a | R-134a |
| Features | ||
| Wi-Fi | Built in | No |
| App | NaviLink | - |
| 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 |
| Released | 2025-06 | 2024-09 |