JOHN WOOD HPACO-45 1**+AXST-50T 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).
If you are checking the JOHN WOOD HPACO-45 1**+AXST-50T 1**, this site calculates its use at 923 kWh of electricity a year. That figure applies to the medium draw pattern, the standard daily hot-water usage DOE tests against. It is 2,608 kWh below the 3,531 kWh median of the 426 electric tank models registered at the same draw pattern.
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
- 67 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 45 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
$2,998–$4,170 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
This site calculated the 923 kWh figure; the registry does not publish it. The calculation starts from the registry's UEF, the ratio of hot water delivered to energy used. For this model the UEF is 3.52, applied to the DOE test's daily hot-water draw for the medium pattern. The source is the DOE CCD, retrieved 2026-09-19. Among the 426 electric tank models at the medium draw pattern, this model ranks 70th lowest in energy use. The class median is 3,531 kWh a year, so this model sits 2,608 kWh below it under the same test conditions. The figure holds only at the federal test's draw and is not a measurement from any home. The page on how the annual cost is calculated sets out each step.
The medium draw pattern stands for a typical mid-sized household with a busy morning. For that level of use, this model lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 67 gallons. Its rated volume is 45 gallons. A plumber or seller checking a quoted unit can compare these two values with the model record. A household that uses more hot water than the medium pattern assumes falls outside this rating. For that use, the 923 kWh figure does not apply, and this page has no figure for heavier use. To compare units in the same class, use the tool to find a same-class replacement by model number or the selector by fuel, space and size.
The running cost is not given in this text because it depends on your own utility's electricity rate. The page works it out from your ZIP by applying your rate to the 923 kWh yearly figure at the medium draw pattern. You can repeat that step in the cost calculator on your own ZIP. The installed price range has its own block, with its source and date. That range is a modeled installed-cost range, not a quote. The cost gap between this model and the class median also depends on your rate; only the 2,608 kWh energy difference stays the same whatever the rate. This page has no figures for use outside the federal test and no measurements from homes.
DOE CCD · 2026-09-19