MRCOOL MTWH04540ET
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 checking the MRCOOL MTWH04540ET, this electric tank uses 3,531 kWh of electricity a year. That figure applies to the medium draw pattern, the standard daily hot-water usage DOE tests against. It equals the class median of 3,531 kWh among 426 comparable models, a difference of 0 kWh.
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
This site calculates the 3,531 kWh figure; the registry does not publish it. It 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 0.92, from the DOE Compliance Certification Database, retrieved 2026-09-19. The medium pattern stands for a typical household's daily hot-water use as DOE defines it. The figure therefore holds only at that test draw. A household that uses more hot water than the test assumes will use more than 3,531 kWh. A household that uses less will use less. This page does not show how far your own use differs from the test draw. The method behind the annual energy and cost figures sets out each step.
The class for this model is the 426 models registered as an electric tank at the medium draw pattern. Within that class, this model ranks 213th lowest for energy use. That rank puts it in the second-lowest quarter of the class, at the class median noted above. The tank has a rated volume of 37 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 55 gallons. The rating covers a household whose peak hour stays within 55 gallons of hot water. A household that needs more than 55 gallons in its peak hour needs more than this rating covers. To check another unit in the same class, use the same-class replacement search by model number.
The text on this page does not give a running cost. The cost of 3,531 kWh of electricity a year depends on your own utility tariff, and tariffs vary by location. The running-cost calculator for your ZIP applies your local rate to this model's figure. Any cost it returns has the same condition as the energy figure: the medium draw pattern at the federal test's daily draw. The installed price range appears in its own block on this page, with its source and date. It is a modeled installed-cost range, not a quote. When you compare this model with another, check that both figures use the medium draw pattern. A figure from a different draw pattern cannot be compared with 3,531 kWh.
DOE CCD · 2026-09-19