DoesTheMath

AMERICAN HPACO-45 1**+AXST-50S 1**

3.52 UEF DOE CCD · 2026-09-19
B

Grade B: where this UEF sits among the 426 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set

An electric tank, medium draw pattern (a typical three- or four-person household, about 55 gallons on a busy morning).

If you are verifying this unit, AMERICAN HPACO-45 1**+AXST-50S 1** uses 923 kWh a year. That figure is for the medium draw pattern, the standard daily hot-water usage DOE tests against. It is 2,608 kWh below the class median of 3,531 kWh, at 70th lowest of 426.

Energy use per year

923 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 below the median of 3,531 kWh for the 426 models registered in the same heater type and draw pattern; it ranks 70 of 426, lowest energy first.

This model: 923 kWh

Solid line: this model (923 kWh). Dashed line: the class median.

Min 773 kWh Median 3,531 kWh Max 3,569 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
3.52 DOE CCD · 2026-09-19 Compared only with other models registered as an electric tank at the medium draw pattern.
Draw Pattern the standard daily usage profile DOE tests the unit against
Medium 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
70 gal DOE CCD · 2026-09-19
Rated Storage Volume the tank size in gallons
46 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

$3,030–$4,180 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 numbers18" ⌀
  • Electrical supplyEnter your numbers240V, 20.2A max
 ENERGY STAR · 2026-09-19

What these figures mean

The figure of 923 kWh is not a registry entry. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw. The UEF is 3.52 for this model. The fuel is electricity, and the source is DOE CCD, retrieved 2026-09-19. The figure applies only to the medium draw pattern, a typical three- or four-person household on a busy morning. Figures for other draw patterns are not available on this page for this model. The steps are described in how the annual cost is calculated.

The class is the 426 models registered as an electric tank at the medium draw pattern. This model sits 2,608 kWh below the class median of 3,531 kWh. Its rank is 70th lowest, placing it in the lowest quarter of its class for energy use. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 70. The rated volume is 46 gallons. This figure suits a household that matches the medium draw pattern. A household that draws more hot water than that is outside the condition of this figure. The water heater selector filters by fuel, space and size for such a household.

The running cost is not stated here because it depends on your own utility electricity rate. Multiply the rate by 923 kWh for the medium draw pattern to check a quote, or use the cost calculator for your ZIP. The result changes with your rate, and with how your use compares with the medium draw pattern. The class median of 3,531 kWh gives a second reference at the same rate. To compare against a same-class replacement, search by model number. The registry lists no figure for your household's actual hot-water use. The energy figure stays tied to the federal test's daily draw, not to metered use.

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 3.52 · Grade B Price it on your ZIP

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