Lennox WHHP050T45MD240S****
3.83 UEF DOE CCD · 2026-09-19Grade A: 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 Lennox WHHP050T45MD240S****, this electric tank uses 848 kWh of electricity a year. That figure applies to the medium draw pattern, the standard daily hot-water usage DOE tests against. It is 2,683 kWh below the class median of 3,531 kWh. That places the model 14th lowest of 426 models at the same pattern.
Energy use per year
848 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 14 of 426, lowest energy first.
Solid line: this model (848 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
- 3.83 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
- 69 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
- 2025-12-01 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-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-513A, GWP 630 ENERGY STAR · 2026-09-19
What it costs to install
$3,033–$4,480 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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Every Lennox model on file
What this brand files, by heater type.
UEF 3.83 · Grade A Price it on your ZIP
This site computed the 848 kWh figure; the registry does not publish 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 medium pattern. This model's UEF is 3.83, as listed in the DOE CCD retrieved 2026-09-19. The medium pattern represents a typical household of several people on the federal test day. If your household uses more or less hot water than that test day, your real use will differ from 848 kWh. How far it would differ is not available from the registry data. The steps behind the figure are set out on the page explaining how the annual energy and cost figures are calculated.
The class comparison above covers only electric tanks rated at the medium pattern, so it does not rank this model against other fuels. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 69 gallons from a rated volume of 45 gallons. A household whose busiest hour stays within 69 gallons matches the conditions behind the 848 kWh figure. A household that needs more than that in its peak hour falls outside what this rating describes. For a different fuel, space or size, the water heater selector by fuel, space and size covers other classes. To match this unit within its own class, use the same-class replacement search by model number.
The text on this page gives no running cost, because the cost depends on your utility's electricity tariff. The page computes it from your ZIP, applying your local rate to the 848 kWh yearly figure. The 2,683 kWh gap to the class median is also stated in energy, not money. What that gap is worth to you depends on the same tariff, and it is unknown until you enter a rate. You can run both numbers in the running cost calculator for your own ZIP. The installed-price range appears in its own block with its source and date. That range is a modeled installed-cost range, not a quote, and it does not change the 848 kWh energy figure.
DOE CCD · 2026-09-19