A. O. SMITH MHE6-30H-045D 1**
0.9 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 A. O. SMITH MHE6-30H-045D 1**, it uses 2,494 kWh of electricity a year at the low draw pattern, the standard daily hot-water usage DOE tests against, here a one- or two-person household. That is 55 kWh above the class median of 2,439 kWh, ranking 122nd lowest in energy use of 163 models.
Energy use per year
2,494 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 above the median of 2,439 kWh for the 163 models registered in the same heater type and draw pattern; it ranks 122 of 163, lowest energy first.
Solid line: this model (2,494 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
- 0.9 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
- 50 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 27 gal DOE CCD · 2026-09-19
What it costs to install
Not published: Installed cost range
This model's UEF lies outside the range NLR REMDB's cost model was fitted on, and the range is not stretched past it.
The annual energy figure on this page does not depend on this range and is unaffected.
Safety 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 A. O. SMITH model on file
What this brand files, by heater type.
UEF 0.9 · Grade G Price it on your ZIP
The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.9 for this model. This site, not the registry, computed 2,494 kWh from that UEF and the DOE test's daily hot-water draw for the low draw pattern. The comparison group is the 163 models registered as an electric tank at the low draw pattern. Their median is 2,439 kWh, so this model sits 55 kWh above it. Its rank of 122nd lowest energy use places it in the second-highest quarter of its class for energy use. The energy figure comes from DOE CCD, retrieved 2026-09-19. The steps behind the calculation are described in the methodology for annual cost.
The 2,494 kWh figure holds only for the condition it was computed under: the low draw pattern at the federal test's daily hot-water draw. It fits a household whose real use is close to that pattern. A household that uses more hot water than the test assumes should expect more electricity than 2,494 kWh, and this page has no figure for other draw patterns. The registry also lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 50 gallons, with a rated volume of 27 gallons. The data here does not say whether those ratings cover any particular household's peak demand. To compare models by fuel, space and size, use the water heater selector.
Running cost is not stated in this text, because it depends on the electricity tariff the reader pays. Multiplying 2,494 kWh by your own rate per kilowatt-hour gives the yearly electricity cost at the low draw pattern. The cost calculator does this from your ZIP code. An installed price range is not published for this model. Its ratings, a first hour rating of 50 gallons and a rated volume of 27 gallons, lie outside the range the cost database's model was fitted on, and the range is not extended past it. Any installation or purchase figure for MHE6-30H-045D 1** is therefore unknown on this page.
DOE CCD · 2026-09-19