JOHN WOOD HPACO-45 1**+AXST-66 1**
3.7 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).
If you are checking the JOHN WOOD HPACO-45 1**+AXST-66 1**, it is an electric tank. It uses 1,341 kWh of electricity a year at the high draw pattern, the standard daily hot-water usage DOE tests against. That is 35 kWh above the median of 1,306 kWh for the 194 electric tanks registered at the high draw pattern.
Energy use per year
1,341 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 above the median of 1,306 kWh for the 194 models registered in the same heater type and draw pattern; it ranks 101 of 194, lowest energy first.
Solid line: this model (1,341 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
- 3.7 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
- 82 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 60 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
$3,505–$4,492 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.
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Every JOHN WOOD model on file
What this brand files, by heater type.
UEF 3.7 · Grade C Price it on your ZIP
This site computes the 1,341 kWh figure; the registry does not state it. The figure 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 3.7, from the DOE Compliance Certification Database (CCD), retrieved 2026-09-19. Among the 194 electric tanks registered at the high draw pattern, it ranks 101st from lowest energy use. That rank puts it in the second-highest quarter of its class for energy use. The figure applies only at the federal test's daily draw. The page on how the annual cost is 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 82 gallons. Its rated volume is 60 gallons. A home that uses hot water at the high pattern is the case the 1,341 kWh figure describes. A smaller household that draws less hot water does not match the test condition. This page does not have this model's energy use at a lower draw. To compare other units by fuel, space and size, use the water heater selector. To match this unit within the same class, find a same-class replacement by model number.
The running cost is not stated in this text. It depends on your own utility's electricity tariff, so the page works it out from your ZIP. The cost calculator for your own ZIP applies your rate to the 1,341 kWh figure. The cost of the 35 kWh gap above the class median of 1,306 kWh also depends on that rate. The installed price on this page is a modeled installed-cost range, not a quote; its source and date sit in its own block. If you are checking a quote or a listing, confirm that the model number reads HPACO-45 1**+AXST-66 1** before you rely on these figures.
DOE CCD · 2026-09-19