Data through June 2026
Running cost · Water Heaters (Electric) · ENERGY STAR certified
American MHPCO-45 1**+MXST-50T 1
Heating a typical household's hot water, the American MHPCO-45 1**+MXST-50T 1 is certified at 923 kWh a year — about $169 at the U.S. average electricity rate, or $14.11 a month. Compared with the median certified electric water heater, it uses 24% less electricity — rank 172 out of 510. Where you live moves the bill from $121 a year in Nevada to $487 in Hawaii.
Dimensions 57" H × 16" W
Estimated annual running cost · U.S. average rate 18.3¢/kWh
$169/yr
- Per month
- $14.11
- Per day
- 46¢
- Certified use
- 923 kWh/yr
- Type
- Hybrid/Electric Heat Pump
- Heat pump type
- Split System HPWH
- Storage volume
- 45 gal
- First-hour rating
- 67 gal
- UEF
- 3.52
What it costs in every state
| State | Rate ¢/kWh | This model $/yr | Relative cost |
|---|---|---|---|
| Alabama | 16.4¢ | $151 | |
| Alaska | 28.2¢ | $260 | |
| Arizona | 15.2¢ | $140 | |
| Arkansas | 14.1¢ | $130 | |
| California | 34.7¢ | $321 | |
| Colorado | 17.1¢ | $158 | |
| Connecticut | 24.3¢ | $224 | |
| Delaware | 19.3¢ | $178 | |
| District of Columbia | 24.4¢ | $225 | |
| Florida | 15.1¢ | $139 | |
| Georgia | 16.4¢ | $151 | |
| Hawaiipriciest | 52.7¢ | $487 | |
| Idaho | 14.4¢ | $133 | |
| Illinois | 19.9¢ | $184 | |
| Indiana | 17.5¢ | $162 | |
| Iowa | 15.9¢ | $147 | |
| Kansas | 15.7¢ | $145 | |
| Kentucky | 14.3¢ | $132 | |
| Louisiana | 13.5¢ | $125 | |
| Maine | 29.6¢ | $273 | |
| Maryland | 21.8¢ | $202 | |
| Massachusetts | 29.6¢ | $273 | |
| Michigan | 23.0¢ | $212 | |
| Minnesota | 17.5¢ | $162 | |
| Mississippi | 14.9¢ | $137 | |
| Missouri | 16.2¢ | $150 | |
| Montana | 15.1¢ | $140 | |
| Nebraska | 13.3¢ | $122 | |
| Nevadacheapest | 13.1¢ | $121 | |
| New Hampshire | 27.0¢ | $249 | |
| New Jersey | 24.9¢ | $230 | |
| New Mexico | 15.1¢ | $139 | |
| New York | 29.5¢ | $272 | |
| North Carolina | 14.7¢ | $136 | |
| North Dakota | 14.1¢ | $130 | |
| Ohio | 19.2¢ | $177 | |
| Oklahoma | 14.3¢ | $132 | |
| Oregon | 16.3¢ | $151 | |
| Pennsylvania | 21.7¢ | $201 | |
| Rhode Island | 29.2¢ | $270 | |
| South Carolina | 15.6¢ | $144 | |
| South Dakota | 15.4¢ | $142 | |
| Tennessee | 14.1¢ | $130 | |
| Texas | 15.9¢ | $147 | |
| Utah | 13.4¢ | $123 | |
| Vermont | 24.4¢ | $226 | |
| Virginia | 17.2¢ | $159 | |
| Washington | 14.9¢ | $138 | |
| West Virginia | 15.4¢ | $143 | |
| Wisconsin | 19.6¢ | $181 | |
| Wyoming | 15.2¢ | $141 |
Certified models closest in efficiency
| Model | kWh/yr | $/yr (US avg) |
|---|---|---|
| A. O. Smith HPACO-45 1**+AXST-50S 1 | 923 | $169 |
| A. O. Smith HPACO-45 1**+AXST-50STTP 1 | 923 | $169 |
| A. O. Smith HPACO-45 1**+AXST-50T 1 | 923 | $169 |
| A. O. Smith HPACO-45 1**+AXST-50TTTP 1 | 923 | $169 |
| A. O. Smith HPACO-45C 1**+AXST-50SC 1 | 923 | $169 |
| A. O. Smith HPACO-45C 1**+AXST-50SCTTP 1 | 923 | $169 |
Run your own numbers
Your rate, your numbers
- Per day
- 46¢
- Per month
- $14.11
- Per year
- $169
923 kWh/yr × 18.3¢/kWh = $169/yr
Prefilled with this model's certified 923 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 American MHPCO-45 1**+MXST-50T 1 use?
- ENERGY STAR certifies the American MHPCO-45 1**+MXST-50T 1 at 923 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 American MHPCO-45 1**+MXST-50T 1 cost to run per month?
- About $14.11 a month at the U.S. average residential rate (18.3¢/kWh) — 46¢ a day, or $169 a year. Your state's rate moves this up or down; see the table above.
- Is the American MHPCO-45 1**+MXST-50T 1 energy efficient?
- It uses 24% less electricity than the median certified electric water heater, placing it in the efficient third of certified models.
- What does the American MHPCO-45 1**+MXST-50T 1 cost to run in the cheapest vs. priciest state?
- At current residential rates it costs about $121 a year in Nevada (13.1¢/kWh) and $487 in Hawaii (52.7¢/kWh).