What the Navien NWP500S065AUMB costs to run
ENERGY STAR certifies the Navien NWP500S065AUMB at 1,245 kWh/yr, more expensive than most models in its category to run for its category.
That $234 is priced at 18.8¢/kWh, the average of all 51 state rates this site tracks. Your own state's rate is one click away.
How the Navien NWP500S065AUMB compares to other electric water heaters
The category average is 1,105 kWh/yr; this model runs 12.7% above it, ranking 417 of 596 electric water heaters tracked here for running cost. 596 certified electric water heaters, one average, about $26/year of daylight between it and this model; the full methodology has the rest.
Neighbouring models
Right next to the Navien NWP500S065AUMB on that list: stream33 S33-HPWH80 ($233/yr, 1,240 kWh/yr) runs slightly less, while LG APHWC501D ($237/yr, 1,262 kWh/yr) runs slightly more.
Comparing Navien's own models
Ranked 2 of Navien's 3 certified electric water heaters, this sits between the NWP500S050AUMB ($158/yr, the brand's cheapest) and the NWP500S080AUMB ($238/yr, its priciest).
Navien NWP500S065AUMB over 11 years
11 years is NAHB's typical service life for this category; at $234/year, the Navien NWP500S065AUMB adds up to about $2,575 in electricity over that span.
Is it worth replacing?
The Navien NWP500S065AUMB runs above its category average. If the electric water heater you actually own is older still, likely well past ENERGY STAR's efficiency baseline when it was made, a current certified model could cost meaningfully less than this model's $234/year every year.
Worth comparing a few current certified models before deciding.
If you're keeping it
Whether or not the Navien NWP500S065AUMB ever needs replacing, a repair is the more common failure for a electric water heater, one a protection plan budgets for ahead of time.
How this was checked
Nothing here is estimated from a nameplate wattage; the 1,245 kWh/yr is ENERGY STAR's own certified figure for this model. Ranked 417 of 596, the Navien NWP500S065AUMB sits in the middle of the electric water heater category, see the guide to why your state changes this number for the other half of the math.