Hubbell ME-40
Hubbell ME-40 is in the DOE listing as of Oct 26, 2026.
It has a labeled size of 40 gallons, a certified storage volume of 37 gallons, a certified UEF of 0.92, and a certified first-hour rating of 46 gallons of hot water.
- Electric storage water heater
- 1 listed model
ENERGY STAR certification does not cover this type of water heater.
Certified figures
- Storage volume
- 37gallons
- UEF
- 0.92Uniform energy factor
- First-hour rating
- 46gallonsHot water in the first hour
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| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| ME-40 | 37 | 0.92 | 46 | 98% | Low |
UEF is the uniform energy factor. A dash means the model has no such figure.
It holds 37 gallons in the test, 3 gallons less than its 40-gallon sold size. Over one hour from a full tank, it gave 46 gallons in the test (its first-hour rating). That is 9 gallons more than its tank holds, since it reheats during the hour. Of 477 electric storage models, 368 give more hot water in the first hour. The median electric storage model gives 55 gallons in its first hour.
In tests, 92% of the energy went to hot water, so its UEF is 0.92. Its test simulated a day of low hot water use (its draw pattern). Of 157 electric storage models with the same draw pattern, 12 have a higher UEF and 76 a lower one. On its draw pattern, its UEF is also the median electric storage UEF. Of the energy spent to reheat water, 98% goes into it (its recovery efficiency).
Its test figures match those of 2 other basic models. Of those, one or more are under the VAUGHN and VAUGHN THERMAL brands.
Also listed as
They carry every figure in the table above.
- Every Hubbell basic model
- Every 40-gallon electric storage water heater
- Every electric storage water heater
Not covered
- Advertised figures. We have none on file for this model.