RELIANCE WATER HEATERS HPACO-45 1**+AXST-50LBTTP 1**
3.55 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 this unit's rated figures, the RELIANCE WATER HEATERS HPACO-45 1**+AXST-50LBTTP 1** uses 915 kWh of electricity a year. That figure belongs to the medium draw pattern, the standard daily hot-water usage DOE tests against. It sits 2,616 kWh below the 3,531 kWh median of the 426 electric tank models registered at that draw pattern.
Energy use per year
915 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 60 of 426, lowest energy first.
Solid line: this model (915 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
- 3.55 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
- 72 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 48 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
$3,099–$4,228 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 RELIANCE WATER HEATERS model on file
What this brand files, by heater type.
UEF 3.55 · Grade B Price it on your ZIP
This site computes the 915 kWh figure; the registry does not publish it. The calculation 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 medium draw pattern. This model's UEF is 3.55, from DOE CCD data retrieved 2026-09-19. Among the 426 electric tank models at that draw pattern, it ranks 60th lowest for energy use. That places it in the lowest quarter of its class. A household that uses more or less hot water than the test assumes will see use that differs from 915 kWh. The steps behind the annual energy and cost figures are set out separately.
The medium draw pattern describes a typical three- or four-person household on a busy morning. The 915 kWh figure applies to a home that fits that profile. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 72 gallons for this model. Its rated volume is 48 gallons. A household that is much smaller or larger than this profile falls outside the test condition. This page has no energy figure for that case, because the data covers only the medium draw pattern. To compare units by fuel, space and size, use the water heater selector. You can also look up same-class replacements by model number.
This text gives no running cost, because the cost depends on your own utility's electricity tariff. The page calculates it from the rate for your ZIP and the 915 kWh figure. On a higher tariff, the same 915 kWh costs more; on a lower tariff, it costs less. The gap of 2,616 kWh to the class median of 3,531 kWh does not change with the tariff, because it is an energy measure, not a cost. To see the figure for your own home, open the running cost calculator for your ZIP. The installed price range appears in its own block, with its source and date. It is a modeled range, not a quote from an installer.
DOE CCD · 2026-09-19