Data through April 2026
Running cost · Water Heaters (Electric) · ENERGY STAR certified
A. O. Smith HPACO-45C 1**+AXST-80CTTP 1
Heating a typical household's hot water, the A. O. Smith HPACO-45C 1**+AXST-80CTTP 1 is certified at 1,306 kWh a year — about $246 at the U.S. average electricity rate, or $20.49 a month. It sits near the bottom of the certified table — using 21% more than the median electric water heater (rank 446 of 566) — so the state you live in matters more than usual. The same unit costs $161 a year in North Dakota but $609 in Hawaii — electricity rates, not the appliance, make the difference.
Estimated annual running cost · U.S. average rate 18.8¢/kWh
$246/yr
- Per month
- $20.49
- Per day
- 67¢
- Certified use
- 1,306 kWh/yr
- Type
- Hybrid/Electric Heat Pump
- Heat pump type
- Split System HPWH
- Storage volume
- 73 gal
- First-hour rating
- 95 gal
- UEF
- 3.8
What it costs in every state
| State | Rate ¢/kWh | This model $/yr | Relative cost |
|---|---|---|---|
| Alabama | 17.4¢ | $227 | |
| Alaska | 27.4¢ | $357 | |
| Arizona | 15.5¢ | $202 | |
| Arkansas | 14.2¢ | $185 | |
| California | 35.3¢ | $460 | |
| Colorado | 16.5¢ | $216 | |
| Connecticut | 32.2¢ | $421 | |
| Delaware | 18.8¢ | $245 | |
| District of Columbia | 25.4¢ | $332 | |
| Florida | 15.4¢ | $201 | |
| Georgia | 15.4¢ | $201 | |
| Hawaiipriciest | 46.6¢ | $609 | |
| Idaho | 12.7¢ | $166 | |
| Illinois | 20.5¢ | $267 | |
| Indiana | 17.9¢ | $234 | |
| Iowa | 13.9¢ | $181 | |
| Kansas | 15.8¢ | $206 | |
| Kentucky | 15.0¢ | $196 | |
| Louisiana | 14.4¢ | $189 | |
| Maine | 28.4¢ | $371 | |
| Maryland | 22.1¢ | $288 | |
| Massachusetts | 29.4¢ | $385 | |
| Michigan | 21.4¢ | $279 | |
| Minnesota | 16.4¢ | $214 | |
| Mississippi | 16.8¢ | $219 | |
| Missouri | 14.0¢ | $183 | |
| Montana | 13.9¢ | $182 | |
| Nebraska | 13.3¢ | $173 | |
| Nevada | 14.3¢ | $187 | |
| New Hampshire | 27.2¢ | $356 | |
| New Jersey | 23.5¢ | $307 | |
| New Mexico | 15.2¢ | $198 | |
| New York | 29.4¢ | $385 | |
| North Carolina | 16.3¢ | $212 | |
| North Dakotacheapest | 12.3¢ | $161 | |
| Ohio | 19.5¢ | $255 | |
| Oklahoma | 13.3¢ | $174 | |
| Oregon | 15.8¢ | $206 | |
| Pennsylvania | 21.5¢ | $280 | |
| Rhode Island | 28.3¢ | $370 | |
| South Carolina | 17.1¢ | $223 | |
| South Dakota | 14.5¢ | $190 | |
| Tennessee | 14.9¢ | $195 | |
| Texas | 17.0¢ | $222 | |
| Utah | 13.3¢ | $174 | |
| Vermont | 24.6¢ | $321 | |
| Virginia | 17.4¢ | $227 | |
| Washington | 14.4¢ | $188 | |
| West Virginia | 16.1¢ | $210 | |
| Wisconsin | 19.2¢ | $251 | |
| Wyoming | 14.7¢ | $192 |
Certified models closest in efficiency
| Model | kWh/yr | $/yr (US avg) |
|---|---|---|
| A. O. Smith HPACO-45 1**+AXST-80 1 | 1,306 | $246 |
| A. O. Smith HPACO-45 1**+AXST-80TTP 1 | 1,306 | $246 |
| A. O. Smith HPACO-45C 1**+AXST-80C 1 | 1,306 | $246 |
| American MHPCO-45 1**+MXST-80 1 | 1,306 | $246 |
| American MHPCO-45 1**+MXST-80TTP 1 | 1,306 | $246 |
| Giant GTHPCO-45 1**+GTXST-80 1 | 1,306 | $246 |
Run your own numbers
Your rate, your numbers
- Per day
- 67¢
- Per month
- $20.49
- Per year
- $246
1,306 kWh/yr × 18.8¢/kWh = $246/yr
Prefilled with this model's certified 1,306 kWh/yr — adjust if your usage differs from the DOE test basis. The certified annual kWh comes from the DOE Uniform Energy Factor test, which simulates a typical household's daily hot-water draw pattern. Only electric models (including heat-pump units) are listed — gas models burn gas, not kWh.
Questions, answered with the data
- How much electricity does the A. O. Smith HPACO-45C 1**+AXST-80CTTP 1 use?
- ENERGY STAR certifies the A. O. Smith HPACO-45C 1**+AXST-80CTTP 1 at 1,306 kWh per year. The certified annual kWh comes from the DOE Uniform Energy Factor test, which simulates a typical household's daily hot-water draw pattern. Only electric models (including heat-pump units) are listed — gas models burn gas, not kWh.
- How much does the A. O. Smith HPACO-45C 1**+AXST-80CTTP 1 cost to run per month?
- About $20.49 a month at the U.S. average residential rate (18.8¢/kWh) — 67¢ a day, or $246 a year. Your state's rate moves this up or down; see the table above.
- Is the A. O. Smith HPACO-45C 1**+AXST-80CTTP 1 energy efficient?
- It uses 21% more electricity than the median certified electric water heater, which puts it among the least efficient certified models.
- What does the A. O. Smith HPACO-45C 1**+AXST-80CTTP 1 cost to run in the cheapest vs. priciest state?
- At current residential rates it costs about $161 a year in North Dakota (12.3¢/kWh) and $609 in Hawaii (46.6¢/kWh).