Data through June 2026
Running cost · Water Heaters (Electric) · ENERGY STAR certified
GSW WATER HEATERS GHPCO-45 1**+GXST-66TTP 1
Heating a typical household's hot water, the GSW WATER HEATERS GHPCO-45 1**+GXST-66TTP 1 is certified at 1,341 kWh a year — about $246 at the U.S. average electricity rate, or $20.49 a month. Even among certified models it's on the thirsty end: 11% more electricity than the median electric water heater, ranked 418 of 510. Where you live moves the bill from $176 a year in Nevada to $707 in Hawaii.
Dimensions 59" H × 18" W
Estimated annual running cost · U.S. average rate 18.3¢/kWh
$246/yr
- Per month
- $20.49
- Per day
- 67¢
- Certified use
- 1,341 kWh/yr
- Type
- Hybrid/Electric Heat Pump
- Heat pump type
- Split System HPWH
- Storage volume
- 60 gal
- First-hour rating
- 82 gal
- UEF
- 3.7
What it costs in every state
| State | Rate ¢/kWh | This model $/yr | Relative cost |
|---|---|---|---|
| Alabama | 16.4¢ | $220 | |
| Alaska | 28.2¢ | $378 | |
| Arizona | 15.2¢ | $204 | |
| Arkansas | 14.1¢ | $189 | |
| California | 34.7¢ | $466 | |
| Colorado | 17.1¢ | $230 | |
| Connecticut | 24.3¢ | $326 | |
| Delaware | 19.3¢ | $259 | |
| District of Columbia | 24.4¢ | $327 | |
| Florida | 15.1¢ | $202 | |
| Georgia | 16.4¢ | $219 | |
| Hawaiipriciest | 52.7¢ | $707 | |
| Idaho | 14.4¢ | $193 | |
| Illinois | 19.9¢ | $267 | |
| Indiana | 17.5¢ | $235 | |
| Iowa | 15.9¢ | $214 | |
| Kansas | 15.7¢ | $211 | |
| Kentucky | 14.3¢ | $191 | |
| Louisiana | 13.5¢ | $181 | |
| Maine | 29.6¢ | $397 | |
| Maryland | 21.8¢ | $293 | |
| Massachusetts | 29.6¢ | $397 | |
| Michigan | 23.0¢ | $308 | |
| Minnesota | 17.5¢ | $235 | |
| Mississippi | 14.9¢ | $200 | |
| Missouri | 16.2¢ | $218 | |
| Montana | 15.1¢ | $203 | |
| Nebraska | 13.3¢ | $178 | |
| Nevadacheapest | 13.1¢ | $176 | |
| New Hampshire | 27.0¢ | $362 | |
| New Jersey | 24.9¢ | $335 | |
| New Mexico | 15.1¢ | $202 | |
| New York | 29.5¢ | $395 | |
| North Carolina | 14.7¢ | $198 | |
| North Dakota | 14.1¢ | $189 | |
| Ohio | 19.2¢ | $257 | |
| Oklahoma | 14.3¢ | $192 | |
| Oregon | 16.3¢ | $219 | |
| Pennsylvania | 21.7¢ | $291 | |
| Rhode Island | 29.2¢ | $392 | |
| South Carolina | 15.6¢ | $209 | |
| South Dakota | 15.4¢ | $206 | |
| Tennessee | 14.1¢ | $189 | |
| Texas | 15.9¢ | $214 | |
| Utah | 13.4¢ | $179 | |
| Vermont | 24.4¢ | $328 | |
| Virginia | 17.2¢ | $231 | |
| Washington | 14.9¢ | $200 | |
| West Virginia | 15.4¢ | $207 | |
| Wisconsin | 19.6¢ | $262 | |
| Wyoming | 15.2¢ | $204 |
Certified models closest in efficiency
| Model | kWh/yr | $/yr (US avg) |
|---|---|---|
| A. O. Smith HPACO-45 1**+AXST-66 1 | 1,341 | $246 |
| A. O. Smith HPACO-45 1**+AXST-66TTP 1 | 1,341 | $246 |
| A. O. Smith HPACO-45C 1**+AXST-66C 1 | 1,341 | $246 |
| A. O. Smith HPACO-45C 1**+AXST-66CTTP 1 | 1,341 | $246 |
| American MHPCO-45 1**+MXST-66 1 | 1,341 | $246 |
| American MHPCO-45 1**+MXST-66TTP 1 | 1,341 | $246 |
Run your own numbers
Your rate, your numbers
- Per day
- 67¢
- Per month
- $20.49
- Per year
- $246
1,341 kWh/yr × 18.3¢/kWh = $246/yr
Prefilled with this model's certified 1,341 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 GSW WATER HEATERS GHPCO-45 1**+GXST-66TTP 1 use?
- ENERGY STAR certifies the GSW WATER HEATERS GHPCO-45 1**+GXST-66TTP 1 at 1,341 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 GSW WATER HEATERS GHPCO-45 1**+GXST-66TTP 1 cost to run per month?
- About $20.49 a month at the U.S. average residential rate (18.3¢/kWh) — 67¢ a day, or $246 a year. Your state's rate moves this up or down; see the table above.
- Is the GSW WATER HEATERS GHPCO-45 1**+GXST-66TTP 1 energy efficient?
- It uses 11% more electricity than the median certified electric water heater, which puts it among the least efficient certified models.
- What does the GSW WATER HEATERS GHPCO-45 1**+GXST-66TTP 1 cost to run in the cheapest vs. priciest state?
- At current residential rates it costs about $176 a year in Nevada (13.1¢/kWh) and $707 in Hawaii (52.7¢/kWh).