Navien NWP500 65-Gallon is a heat pump (hybrid electric) water heater from Navien with a 61 gallon rated tank and a 80 gallon first-hour rating at a 4.03 UEF — 1245 kWh/yr certified use, 63 in tall.
Our take
Navien's 61-gallon NWP500 posts a 4.03 UEF — 79th percentile — at about $212 a year High-draw, with an 80-gallon first-hour rating 2 above the class median. Two caveats surface in the certified record: at 41 °F its compressor cutoff is the highest in the class, handing over to resistance elements in rooms that are merely cool, and at 63 inches tall by 25 across it is among the larger bodies here. No connectivity; Navien badge only. In a heated mechanical room the economics are top-tier; in a cold basement, less so.
Best for: Conditioned-space installs chasing top-quartile efficiency.
Trade-off: The class's earliest compressor cutoff undermines cold-room siting.
Efficiency
Uniform Energy Factor (UEF)
4.03
Annual electricity use
1245 kWh/yr
Recovery efficiency
433 %
General
Fuel
Electric
Capacity
First-hour rating
80 gal
Rated storage volume
61 gal
Draw pattern
High
Heat pump
Heat pump type
240 Volt Integrated HPWH
Refrigerant (GWP)
R-134a (GWP:1430)
Compressor low-temp cutoff
41 °F
Installation
Input voltage
240
Max current draw
23 A
Smart features
Smart / connected capable
No
Dimensions
Height
63 in
Diameter
25 in
Certification
ENERGY STAR certified
Yes
Who is the Navien NWP500 65-Gallon for?
Its 80 gallon first-hour rating suits a
household of 5+ people under DOE sizing guidance.
Estimated running cost: about $212/year at the national
average electricity rate (1245 kWh/yr certified use).
Needs a 240 V circuit; at 23 A max draw plan for a 30 A breaker (NEC 125% continuous-load rule).
The heat pump compressor operates down to 41 °F ambient — below that, backup
elements take over.
Is the Navien NWP500 65-Gallon ENERGY STAR certified?
Yes, the Navien NWP500 65-Gallon holds a current ENERGY STAR certification for water heating efficiency (UEF 4.03).
How much does the Navien NWP500 65-Gallon cost to run per year?
About $212 per year at national average energy rates, based on its certified annual energy use under the DOE test draw pattern. Your rate and usage change this figure.
What electrical circuit does the Navien NWP500 65-Gallon need?
The Navien NWP500 65-Gallon runs on a 240 V circuit drawing up to 23 A; per the NEC 125% continuous-load rule plan for at least a 30 A breaker (check the installation manual for the required circuit).
Is the Navien NWP500 65-Gallon a smart water heater?
No, the Navien NWP500 65-Gallon is not connected-capable — it has no app connectivity or demand-response support.
