A. O. Smith CAHP-66 2 Running Cost (Electric Water Heater)
Running cost for the A. O. Smith CAHP-66 2
ENERGY STAR certifies the A. O. Smith CAHP-66 2 at 1,292 kWh/yr, more expensive than most models in its category to run for its category.
The $243 figure above uses the simple average of all 51 published state rates. Pick your state for the real number.
A. O. Smith CAHP-66 2 against the category
That's 16.9% above the electric water heater category average of 1,105 kWh/yr, and ranks 445 of 596 certified electric water heaters for annual running cost, 1 being cheapest. The category average comes from every electric water heater ENERGY STAR currently certifies (596 models), not an outside benchmark, about $35/year above that average at the national rate. See the methodology page.
What sits beside it in the ranking
A. O. Smith HPA10-66H45DV 2 ($243/yr, 1,292 kWh/yr) costs a little more to run than the A. O. Smith CAHP-66 2. Ariston ARIHPWH-65 ($242/yr, 1,289 kWh/yr) costs a little less.
Comparing A. O. Smith's own models
A. O. Smith makes 61 ENERGY STAR certified electric water heaters; this one ranks 35 of 61 for running cost, between the brand's cheapest, the HPS10-50H45DV 2 at $156/yr, and its priciest, the HPV10-80H01DV 2 at $311/yr.
What this adds up to over time
Over the 11-year service life NAHB reports for this category, running the A. O. Smith CAHP-66 2 costs roughly $2,672 in electricity, separate from the purchase price.
Shopping for a new one
The A. O. Smith CAHP-66 2 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 $243/year every year.
Worth comparing a few current certified models before deciding.
Protecting what you have
The A. O. Smith CAHP-66 2 already costs $243/year to run; a repair bill on top of that is the kind of expense a protection plan exists to smooth out.
Sourcing
Two sourced numbers, nothing modeled: ENERGY STAR's certified kWh/yr for this exact model, and EIA's published state electricity rate. The full Electric Water Heater category page shows all 596 electric water heaters ranked by cost; the state-rate guide covers the half of this number that isn't the appliance.