A. O. Smith GCF-40 1**
A. O. Smith GCF-40 1** is in the DOE listing as of Oct 26, 2026.
It has a labeled size of 40 gallons, a certified storage volume of 38 gallons, a certified UEF of 0.64, and a certified first-hour rating of 70 gallons of hot water.
Its advertised UEF of 0.65 from A. O. Smith differs from the certified 0.64 (Read Oct 4, 2026).
- Gas storage water heater
- 3 listed models
Not listed as ENERGY STAR certified on Oct 26, 2026.
Certified figures
- Storage volume
- 38gallons
- UEF
- 0.64Uniform energy factor
- First-hour rating
- 70gallonsHot water in the first hour
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| Figure | Advertised | Certified | Advertiser | Read |
|---|---|---|---|---|
| Size | 40 gal, nominal size | 38 gal storage volume | A. O. Smith | Read Oct 4, 2026 |
| Size | 38 gal | 38 gal storage volume | A. O. Smith | Read Oct 4, 2026 |
| UEF | 0.65 | 0.64 | A. O. Smith | Read Oct 4, 2026 |
| UEF | 0.64 | 0.64 | A. O. Smith | Read Oct 4, 2026 |
| UEF | up to 0.64 | 0.64 | A. O. Smith | Read Oct 4, 2026 |
| First-hour rating | 70 gal | 70 gal | A. O. Smith | Read Oct 4, 2026 |
Certified figures by listed model
| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| G12-FDT4040NVR 1** | 38 | 0.64 | 70 | 73% | Medium |
| GCF-40 1** | 38 | 0.64 | 70 | 73% | Medium |
| GCF-40 1*1 | 38 | 0.64 | 70 | 73% | Medium |
UEF is the uniform energy factor. A dash means the model has no such figure.
It holds 38 gallons in the test, 2 gallons less than its 40-gallon sold size. Over one hour from a full tank, it gave 70 gallons in the test (its first-hour rating). That is 32 gallons more than its tank holds, since it reheats during the hour. Of 763 gas storage models, 510 give more hot water in the first hour. The median gas storage model gives 78 gallons in its first hour.
On Oct 26, 2026, this heater was not listed as ENERGY STAR certified. In tests, 64% of the energy went to hot water, so its UEF is 0.64. The daily hot water use in the test, called its draw pattern, was medium. Among 288 gas storage models on its draw pattern, 43 have a higher UEF. On its draw pattern, the median gas storage UEF is 0.60. Of the energy spent to reheat water, 73% goes into it (its recovery efficiency).
Its 3 model numbers are G12-FDT4040NVR 1**, GCF-40 1**, and GCF-40 1*1. All of its test figures are shared by 5 other basic models. They are listed under 5 other brands, one each.
It may qualify for one rebate program.
Also listed as
They carry every figure in the table above.
Rebates
| Program | State | Status | Program page |
|---|---|---|---|
| Xcel Energy MINNESOTA RESIDENTIAL ENERGY EFFICIENCY PROGRAMS (gas storage, gas tankless) | MN | May qualify | Its own page |
Programs change their terms. Check the program's own page before you buy.
- Every A. O. Smith basic model
- Every 40-gallon gas storage water heater
- Every gas storage water heater
- The most-searched gas storage models side by side
Not covered
- Changes to an advertised figure after the date beside it.