GIANT HPACO-45 1**+AXST-80 1**
3.8 UEF DOE CCD · 2026-09-19Grade 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 the GIANT HPACO-45 1**+AXST-80 1**? At the high draw pattern, the standard daily hot-water usage DOE tests against, this electric tank uses 1,306 kWh of electricity a year. That equals the median of 1,306 kWh for the 194 electric tanks registered at the high draw pattern, a difference of 0 kWh.
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.
Solid line: this model (1,306 kWh). Dashed line: the class median.
Min 1,002 kWh Median 1,306 kWh Max 5,334 kWh
What it costs to run where you live
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) · 2026-04-01Safety 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 · 2026-09-24Does 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
What these figures mean
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
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Find what replaces your water heater
Enter the model number off your old unit and see what is on file today, with the yearly cost difference.
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Find a water heater that fits
Three questions — fuel, hot water need, install space — narrow every model on file to the ones that fit.
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What a water heater costs to run
Prices a unit's efficiency against your own utility's filed tariff for your ZIP code.
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What size heat pump water heater do I need?
Answered from what models in this size actually file.
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Water heaters
Every model on file with the Department of Energy, by heater type.
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All heat pump water heaters
Electric tanks that file a UEF of 2.0 or more — the registry has no separate heat pump type, so this site draws the line there.
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All CO₂ (R-744) heat pump water heaters
Heat pump models whose ENERGY STAR filing names R-744 (carbon dioxide) as the refrigerant, a global warming potential of 1.
UEF 3.8 · Grade C Price it on your ZIP
This site calculates the 1,306 kWh figure; the registry does not publish it. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the high draw pattern. This model's UEF is 3.8, taken from the DOE CCD on 2026-09-19. It ranks 89th lowest in energy use among the 194 models in its class. That puts it in the second-lowest quarter of the class, even though its annual figure matches the class median. The figure applies only at the test's daily draw. This page has no measurement of the hot water your household actually uses. The page on how the annual energy and cost figures are calculated sets out each step.
The high draw pattern describes a larger household, or one where showers and laundry overlap. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 95 gallons. Its rated volume is 73 gallons. The 1,306 kWh figure matches the conditions of a home that uses about this much hot water every day. The figure does not describe a household that uses much less hot water than the high pattern. The registry gives no energy figure for this model at a lighter draw, so that value is not available here. The 95 gallon rating does not cover a home that needs more hot water than that in its busiest hour. To compare models by model number within the same class, use the same-class replacement finder.
The text on this page does not state a running cost. The cost of 1,306 kWh of electricity a year depends on your own utility tariff, and that tariff varies by provider and rate plan. The page calculates the cost from your ZIP instead of estimating it. You can also run the running-cost calculator for your ZIP. The result carries the same condition as the energy figure: the high draw pattern at the federal test's daily draw. Your electricity rate does not change the rank of 89th of 194, because every model in the class is compared at the same test draw. The installed price elsewhere on this page is a modeled range with its own source and date. It is not a quote.
DOE CCD · 2026-09-19