MRCOOL MTWH04540E
0.92 UEF DOE CCD · 2026-09-19Grade G: 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 verifying the MRCOOL MTWH04540E, an electric tank, it uses 3,531 kWh of electricity a year. That figure belongs to the medium draw pattern, the standard daily hot-water usage DOE tests against. It is equal to its class median of 3,531 kWh, a difference of 0 kWh, and ranks 213th lowest of 426.
Energy use per year
3,531 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 equal to the median of 3,531 kWh for the 426 models registered in the same heater type and draw pattern; it ranks 213 of 426, lowest energy first.
Solid line: this model (3,531 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
- 0.92 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
- 55 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 37 gal DOE CCD · 2026-09-19
What it costs to install
$1,605–$1,828 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 · 2026-09-24What 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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Is a 40-gallon water heater enough?
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 electric resistance tank water heaters
Electric tanks that file a UEF below 2.0 — heated by elements, not a heat pump.
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Every MRCOOL model on file
What this brand files, by heater type.
UEF 0.92 · Grade G Price it on your ZIP
The 3,531 kWh figure is calculated by this site. It does not come directly from the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the daily hot-water draw set by the DOE test for the medium draw pattern. This model's UEF is 0.92. The source is the DOE CCD, retrieved 2026-09-19. The figure applies only at that test draw. If a home uses more or less hot water than the test day, its energy use will be different, and this page does not estimate that amount. The page on how the annual cost is calculated shows each input and step.
DOE uses the medium draw pattern to represent a typical mid-sized household with a busy morning peak. This model has a first hour rating, the gallons of hot water available in the first hour from a full tank, of 55 gallons. Its rated volume is 37 gallons. It fits a household whose busiest hour of hot-water use stays within 55 gallons. It does not fit a household whose peak hour needs more than that. The class comparison covers electric tanks only, so it does not show how this model compares with gas or tankless units. To compare across fuels, use the water heater selector by fuel, space and size.
This model is compared with the 426 models registered as an electric tank at the medium draw pattern. Among them, it ranks 213th lowest in energy use. Its difference from the class median is 0 kWh, so its energy use is in the middle of the class rather than near either end. This text does not state a running cost, because the cost depends on your own utility's electricity tariff. The cost calculator for your ZIP uses 3,531 kWh and your local rate to calculate it. The installed price range appears in its own block on this page, with its source and date. That range is modeled and is not a quote. To check other electric tanks in this class, use the same-class replacement search by model number.
DOE CCD · 2026-09-19