Navien NWP500 40-Gallon is a heat pump (hybrid electric) water heater from Navien with a 44 gallon rated tank and a 65 gallon first-hour rating at a 3.85 UEF — 840 kWh/yr certified use, 63 in tall.
Efficiency
Uniform Energy Factor (UEF)
3.85
Annual electricity use
840 kWh/yr
Recovery efficiency
461 %
General
Fuel
Electric
Capacity
First-hour rating
65 gal
Rated storage volume
44 gal
Draw pattern
Medium
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
21.8 in
Certification
ENERGY STAR certified
Yes
Who is the Navien NWP500 40-Gallon for?
Its 65 gallon first-hour rating suits a
household of 3–4 people under DOE sizing guidance.
Estimated running cost: about $143/year at the national
average electricity rate (840 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 40-Gallon ENERGY STAR certified?
Yes, the Navien NWP500 40-Gallon holds a current ENERGY STAR certification for water heating efficiency (UEF 3.85).
How much does the Navien NWP500 40-Gallon cost to run per year?
About $143 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 40-Gallon need?
The Navien NWP500 40-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 40-Gallon a smart water heater?
No, the Navien NWP500 40-Gallon is not connected-capable — it has no app connectivity or demand-response support.
