A. O. SMITH MHE6-40RW-035D-1**
0.91 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 A. O. SMITH MHE6-40RW-035D-1**, this electric tank uses 2,466 kWh of electricity a year. That figure applies to the low draw pattern, the standard daily hot-water usage DOE tests against. It sits 27 kWh above the class median of 2,439 kWh, ranking 88th lowest in energy use of 163 models.
Energy use per year
2,466 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 88 of 163, lowest energy first.
Solid line: this model (2,466 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
- 0.91 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
- 40 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 36 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 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 A. O. SMITH model on file
What this brand files, by heater type.
UEF 0.91 · Grade G Price it on your ZIP
The 2,466 kWh figure was calculated by this site, not by the registry. 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 low pattern. The registry lists a UEF of 0.91 for this model. The low pattern represents a one- or two-person household, so the figure holds only at that test draw. This data gives no figure for other daily usage. Registry data was retrieved from the DOE CCD on 2026-09-19. The comparison class is the 163 models registered as an electric tank at the low pattern. Within it, this model sits in the second-highest quarter for energy use. The calculation steps are on the page explaining how the annual cost is calculated.
The registry lists a rated volume of 36 gallons for this model. It also lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 40 gallons. These ratings, with the energy figure, suit a reader verifying a unit for a one- or two-person household on electricity. They do not describe a household that draws more hot water each day. For that case, this data holds no energy figure, so it is unknown here. The 27 kWh gap above the class median is the only difference this data records against the class. The registry does not say whether that gap matters for a given home. To compare other models, use the selector by fuel, space and size.
The text on this page gives no running cost. The cost of 2,466 kWh a year depends on your own utility's electricity tariff. The cost calculator on your own ZIP applies your rate to this model's energy figure. An installed price range is not published for this model either. Its ratings lie outside the range the cost database's model was fitted on. The site does not stretch that range to cover them, so the installed price is not available here. If you are checking a unit already in place, you can find a same-class replacement by model number. That search uses the same electric tank, low-pattern class described above.
DOE CCD · 2026-09-19