MRCOOL MTWH04530E
0.92 UEF DOE CCD · 2026-09-19Grade G: where this UEF sits among the 163 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
An electric tank, low draw pattern (a one- or two-person household).
If you are checking the MRCOOL MTWH04530E, it uses 2,439 kWh of electricity a year under the low draw pattern, the standard daily hot-water usage DOE tests against. That figure applies at the federal test's daily draw. It equals the 2,439 kWh median of the 163 electric tank models at the same draw pattern.
Energy use per year
2,439 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 2,439 kWh for the 163 models registered in the same heater type and draw pattern; it ranks 19 of 163, lowest energy first.
Solid line: this model (2,439 kWh). Dashed line: the class median.
Min 724 kWh Median 2,439 kWh Max 2,550 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 low draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- Low 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
- 47 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 28 gal DOE CCD · 2026-09-19
What it costs to install
$1,475–$1,602 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 30-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 2,439 kWh figure is not a registry field. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used. The other input is the DOE test's daily hot-water draw for the low draw pattern. For the MTWH04530E, the UEF is 0.92. The source is the DOE CCD, retrieved 2026-09-19. The result holds only at the test's daily draw. A home that draws more or less hot water will use a different amount of electricity. The data does not say how large that difference would be for any given home. The method behind the annual energy and cost figures sets out each step of the calculation.
The MTWH04530E ranks 19th lowest in energy use of 163 electric tank models at the low draw pattern. That places it in the lowest quarter of its class. Its 2,439 kWh is also 0 kWh from the class median of 2,439 kWh. The data does not explain how models with equal figures are ordered, so read the rank and the median together. The low draw pattern is the one tested for a one- or two-person household. The rated volume is 28 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 47 gallons. A home that needs more than 47 gallons within that first hour is outside what this rating covers. To check other units in the same class, look up a same-class replacement by model number.
The running cost is not stated in this text. It depends on your own utility's electricity tariff, and the data here holds no tariff. The running-cost calculator for your own ZIP applies your local rate to the 2,439 kWh figure. That result carries the same condition: the low draw pattern at the 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 from any installer. To start from other inputs instead, the water heater selector by fuel, space and size works from those details. Anything not in the registry data above, such as a measured bill for a real home, is not available here.
DOE CCD · 2026-09-19