LG Inverter Heat Pump 80 Gal
#2 in 80 GallonFull review
The pick for a cold garage or basement: its heat pump keeps working in rooms down to 23 °F. Sold through LG’s HVAC dealers.
The LG Inverter Heat Pump 80 Gal is the better heat pump water heater overall, rated 3.8 to 3.5. The LG Inverter Heat Pump 80 Gal leads on cold rooms, hot water and noise. The Navien NWP500 80 Gal wins on warranty and efficiency.
Navien NWP500 80 Gal
#11 in 80 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.
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 LG Inverter Heat Pump 80 Gal for cold rooms (heat pump runs down to 23 °F room air vs heat pump runs down to 41 °F room air), hot water (94 gallons in the first hour vs 85 gallons in the first hour) and noise (42 dB(A) vs 45 dB(A)).
- Choose the Navien NWP500 80 Gal for warranty (10-year tank, 10-year parts, 1-year labor vs 10-year tank, 1-year parts) and efficiency (4.05 UEF vs 3.90 UEF).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 80 gallon heat pump water heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | LG Inverter Heat Pump 80 Gal | Navien NWP500 80 Gal |
|---|---|---|
| Overall rating | 3.8/5 | 3.5/5 |
| Efficiency 35% | 64 3.90 UEF | 75 4.05 UEF |
| Hot water 20% | 76 94 gallons in the first hour | 40 85 gallons in the first hour |
| Warranty 20% | 30 10-year tank, 1-year parts | 75 10-year tank, 10-year parts, 1-year labor |
| Cold rooms 15% | 88 heat pump runs down to 23 °F room air | 16 heat pump runs down to 41 °F room air |
| Noise 10% | 88 42 dB(A) | 69 45 dB(A) |
Specifications
| LG Inverter Heat Pump 80 Gal | Navien NWP500 80 Gal | |
|---|---|---|
| Ratings (ENERGY STAR) | ||
| Size (nominal) | 80 gal | 80 gal |
| Tank volume (measured) | 72 gal | 74 gal |
| Uniform Energy Factor | 3.90 | 4.05 |
| First-hour rating | 94 gal | 85 gal |
| Draw pattern | High | High |
| Yearly energy use | 1,272 kWh | 1,265 kWh |
| Heat pump cut-off (low) | 23 °F | 41 °F |
| Sound level | 42 dB(A) | 45 dB(A) |
| ENERGY STAR ID | 2682263 | 4016030 |
| Installation | ||
| Power | 240 V | 240 V |
| Circuit | 30 A, 208/240 V | 30 A, 208/240 V |
| Backup element | 5,000 W | 5,000 W |
| Operating air range | 23 to 120 °F | 41 to 113 °F |
| Minimum room size | 700 cu ft | 640 cu ft |
| Size | 62.7 in tall, 19.7 in across | 71.6 in tall, 25 in across |
| Weight | 224 lb | 220 lb |
| Refrigerant | R-134a | R-134a |
| Features | ||
| Wi-Fi | Built in | Built in |
| App | LG ThinQ | NaviLink |
| Leak detection | - | No |
| Modes | Auto, Turbo, Heat Pump, Vacation | Energy Saver, Heat Pump, High Demand, Electric, Vacation |
| Warranty and models | ||
| Warranty | 10 yr tank, 1 yr parts | 10 yr tank, 10 yr parts, 1 yr labor |
| Released | 2023-04 | 2025-06 |