JOHN WOOD HPACO-45 1**+AXST-50S 1**
3.52 UEF DOE CCD · 2026-09-19Grade 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).
You are checking the JOHN WOOD HPACO-45 1**+AXST-50S 1**, an electric tank water heater. It uses 923 kWh of electricity a year at the medium draw pattern, the standard daily hot-water usage DOE tests against. At that pattern, it sits 2,608 kWh below its class median of 3,531 kWh. It ranks 70th lowest of 426 models.
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.
Solid line: this model (923 kWh). Dashed line: the class median.
Min 773 kWh Median 3,531 kWh Max 3,569 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
- 3.52 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) · 2026-04-01Safety 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 3.52 · Grade B Price it on your ZIP
The registry does not print the 923 kWh figure. This site calculated it from two inputs. The first is the registry's UEF, the ratio of hot water delivered to energy used. The second is the DOE test's daily hot-water draw for the medium pattern. This model's UEF is 3.52, taken from the DOE CCD as retrieved on 2026-09-19. The medium pattern represents a typical household of three or four people. A home that uses more hot water each day than the test draw will use more electricity than 923 kWh a year. A home that uses less will use less. This page does not show how large that difference would be for any particular home. You can check each step in how this site calculates annual energy and cost.
The comparison class is the 426 models registered as an electric tank at the medium draw pattern. In that class, this model is in the lowest quarter for energy use. Its rated volume is 46 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 70 gallons under test conditions. A household whose busiest hour needs no more than 70 gallons falls within the conditions behind this rating. A household that often needs more hot water in a single hour falls outside them. The rating says nothing about how the unit performs in that case. To compare this unit with another model in the same class, use find a same-class replacement by model number.
This text does not give a running cost. The cost of 923 kWh of electricity a year at the medium draw pattern depends on your own utility's electricity tariff. This page cannot see that tariff. The page works out the cost from your ZIP in the running cost calculator for your own ZIP. How much you save compared with the class median depends on the 2,608 kWh gap described above and on your own rate. The installed price range appears in its own block on this page, with its source and date. That range is a modeled installed-cost estimate, not a quote, and its figures are not repeated here. Any electricity use outside the medium draw pattern is not available from this data.
DOE CCD · 2026-09-19