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GSW WATER HEATERS HPACO-45 1**+AXST-80 1**

GSW WATER HEATERS HPACO-45 1**+AXST-80 1** is in the DOE listing as of Oct 22, 2026. GSW WATER HEATERS HPACO-45 1**+AXST-80 1** is in the ENERGY STAR list as of Oct 22, 2026.

  • Heat pump water heater
  • 2 listed models

Its figures are also listed under A. O. Smith HPACO-45 1**+AXST-80 1**.

Storage volume
73gallons
UEF
3.80Uniform energy factor
First-hour rating
95gallonsHot water in the first hour
See it among every heat pump model

Product history

GSW WATER HEATERS HPACO-45 1**+AXST-80 1** was in the DOE listing by Oct 1, 2026.

GSW WATER HEATERS HPACO-45 1**+AXST-80 1** has a recorded ENERGY STAR market-availability date of Feb 13, 2026. It first appeared in the ENERGY STAR list between February 2026 and August 2026.

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
GHPCO-45 1**+GXST-80 1**733.8095423%High
GHPCO-45 1**+GXST-80TTP 1**733.8095423%High

UEF is the uniform energy factor. A dash means the model has no such figure.

ENERGY STAR certified models

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiency
GHPCO-45 1**+GXST-80 1**733.8095423%
GHPCO-45 1**+GXST-80TTP 1**733.8095423%

It holds 73 gallons in the test, 7 gallons less than its 80-gallon sold size. Starting full, it gives 95 gallons of hot water in its first hour of use. Reheating lets it give 22 gallons beyond the 73 gallons in its tank. Of 481 heat pump models, 17 give more hot water in the first hour. The median heat pump model gives 72 gallons in the first hour of the test.

It has 2 model numbers that are ENERGY STAR certified. In the test, it delivered 3.80 units of hot water energy for each unit used (its UEF). It moves heat from the air rather than making it, so its UEF passes 1. Its test ran at the high level of daily hot water use. Of 237 heat pump models with the same draw pattern, 129 have a higher UEF and 96 a lower one. For its type and draw pattern, the UEF runs from 2.85 to 4.95. While it reheats, the water gains 423% of the energy it uses (its recovery efficiency).

It is sold as GHPCO-45 1**+GXST-80 1** and GHPCO-45 1**+GXST-80TTP 1**. Its test figures match those of 7 other basic models. Each of them is listed under a different brand. You can find the whole group on the page for the A. O. Smith HPACO-45 1**+AXST-80 1**.

It may qualify for 17 rebate programs in 17 states. Another 5 programs may accept it if it meets their other terms.

Also listed as

They carry every figure in the table above.

Rebates

ProgramStateStatusProgram page
Efficiency Arizona AZ May qualify Its own page
SRP Heat pump water heater rebate AZ May qualify Its own page
CleanPowerSF Electrify Your Home bill credits CA May qualify Its own page
Los Angeles Department of Water and Power Consumer Rebate Program CA May qualify Its own page
SVCE Home Rebates CA May qualify if it meets the other terms Its own page
TECH Clean California HEEHRA Phase I CA May qualify Its own page
Colorado Springs Utilities Water heater rebate (heat pump) CO May qualify Its own page
Delaware Electric Cooperative Heat Pump Water Heating Rebate DE May qualify Its own page
Hawai‘i State Energy Office eHale Energy Saver Rebate Program HI May qualify Its own page
Ameren Illinois Instant Incentives IL May qualify Its own page
DTE Energy Water Heaters (heat pump) MI May qualify Its own page
Entergy Mississippi Residential Appliances Program MS May qualify Its own page
NC DEQ Energy Saver North Carolina NC May qualify Its own page
NHSaves Heat Pump Water Heater NH May qualify if it meets the other terms Its own page
PNM Home Energy Checkup Rebates NM May qualify Its own page
PECO Appliance Rebates PA May qualify Its own page
Rhode Island Energy Heat Pump Water Heater Rebate RI May qualify if it meets the other terms Its own page
TVA EnergyRight TN, AL, MS, KY, GA, NC, VA May qualify Its own page
Dominion Energy Virginia Water Energy Savings Program VA May qualify Its own page
Virginia Energy Home Energy Rebates VA May qualify if it meets the other terms Its own page
Focus on Energy (heat pump) WI May qualify if it meets the other terms Its own page
Focus on Energy Home Electrification and Appliance Rebates WI May qualify Its own page

Programs change their terms. Check the program's own page before you buy.

Updated Oct 22, 2026 · Methodology

Not covered

  • Advertised figures. We have none on file for this model.