DoesTheMath

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

3.8 UEF DOE CCD · 2026-09-19
C

Grade C: where this UEF sits among the 194 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set

An electric tank, high draw pattern (a larger household, or one where showers and laundry overlap).

Checking this electric tank model against the registry? At the high draw pattern, the standard daily hot-water usage DOE tests against, it uses 1,306 kWh of electricity a year, computed by this site. That equals the class median of 1,306 kWh, a difference of 0 kWh, among 194 comparable models.

Energy use per year

1,306 kWh a year

Computed by this site from the registry's UEF and the federal test's daily hot-water draw for this draw pattern. What it costs depends on the electricity rate where you live.

That is equal to the median of 1,306 kWh for the 194 models registered in the same heater type and draw pattern; it ranks 89 of 194, lowest energy first.

This model: 1,306 kWh

Solid line: this model (1,306 kWh). Dashed line: the class median.

Min 1,002 kWh Median 1,306 kWh Max 5,334 kWh

DOE CCD · 2026-09-19

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What it costs to run where you live

Enter your ZIP to see what this unit costs to run a year on your own utility’s electricity rate.

What the registry files

UEF (Uniform Energy Factor) how much hot water you get for each unit of energy the heater uses
3.8 DOE CCD · 2026-09-19 Compared only with other models registered as an electric tank at the high draw pattern.
Draw Pattern the standard daily usage profile DOE tests the unit against
High DOE CCD · 2026-09-19
First Hour Rating how many gallons of hot water the unit can deliver in one hour, starting from a full tank
95 gal DOE CCD · 2026-09-19
Rated Storage Volume the tank size in gallons
73 gal DOE CCD · 2026-09-19
On the market since (ENERGY STAR) the date the manufacturer told ENERGY STAR the model went on sale
2026-02-13 ENERGY STAR · 2026-09-19
Connected / demand response (ENERGY STAR) whether the unit can take signals from your utility to shift when it heats, and by which standard (such as CTA-2045)
Yes (CTA-2045-A,CTA-2045-B) ENERGY STAR · 2026-09-19
Refrigerant and GWP (ENERGY STAR) the refrigerant a heat pump unit uses and its global warming potential, a leak's climate effect relative to carbon dioxide (CO2 = 1)
R-744 (CO2), GWP 1 ENERGY STAR · 2026-09-19

What it costs to install

$3,938–$4,714 installed

Not a quote — a modeled range of what installers have charged for this class of unit; your price will vary with labor rates, access, and local code requirements.

Escalation indexes: equipment (BLS PPI) latest available: August 2026; labor (BLS ECI) latest available: April 2026 to June 2026.

NLR REMDB (BLS PPI/ECI escalated) · 2026-04-01

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Safety record

No CPSC recall names this model.

Checked against the CPSC recall database. CPSC does not publish a model-level match for this product category, so this list is curated by hand from the manufacturer's recall filings.

CPSC · 2026-09-24

Every water heater recall on file since 2015

Does it fit your space?

Enter your own numbers below — this compares them to what ENERGY STAR publishes for this model, it does not tell you what to buy.

Compressor operating range (ENERGY STAR)
the air temperatures around the unit in which its heat pump runs; outside this range the heat pump stops
Dimensions (ENERGY STAR)
the unit's filed height, width, depth or tank diameter, in inches
Input voltage and maximum current (ENERGY STAR)
the circuit voltage the unit is certified on and the most current it draws
  • Ambient temperatureEnter your numbers1°F min
  • Physical footprintEnter your numbers20" ⌀
  • Electrical supplyEnter your numbers240V, 20.2A max
 ENERGY STAR · 2026-09-19

What these figures mean

The registry lists UEF, the ratio of hot water delivered to energy used, as 3.8 for this electric tank. This site combines that UEF with the DOE test's daily hot-water draw for the high draw pattern to reach 1,306 kWh a year. The registry does not publish that annual figure itself. The data comes from DOE CCD, retrieved 2026-09-19. Among the 194 models registered as an electric tank at this draw pattern, the unit ranks 89th lowest for energy use. That places it in the lower-middle quarter of its class. The method is set out in how the annual cost is calculated.

The high draw pattern describes a larger household, or one where showers and laundry overlap. This model has a first hour rating, the gallons of hot water available in the first hour from a full tank, of 95 gallons, with a rated volume of 73 gallons. Those two figures are the ones to compare with your own peak-hour demand. The energy figure suits a reader whose use resembles the test draw. It does not describe a household with a lighter or heavier daily draw, and this page has no figure for other draw patterns. Readers still working out a size can use the water heater selector by fuel, space and size.

The running cost is not written in this text because it depends on your own utility electricity tariff. The cost calculator on your own ZIP applies your rate to 1,306 kWh. The unit sits at the class median of 1,306 kWh, a difference of 0 kWh, so a model at the median would use the same annual energy at this draw pattern. The installed price range appears in its own block on this page, with its source and date, as a modeled range and not a quote. To compare against a unit of the same class, find a same-class replacement by model number.

DOE CCD · 2026-09-19

How this compares

The closest models in the same class — same fuel, type and draw pattern.

Keep going

How every figure on this page is calculated

UEF 3.8 · Grade C Price it on your ZIP

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