Rheem G100-80
Rheem G100-80 is not in the current certification listing as of Oct 26, 2026.
It has a labeled size of 100 gallons, a certified storage volume of 96 gallons, a certified UEF of 0.57, and a certified first-hour rating of 128 gallons of hot water.
Its advertised first-hour rating of 148 gal from The Home Depot differs from the certified 128 gal (Archived copy, Aug 14, 2024).
- Gas storage water heater
- 1 listed model
This model is not in the current certification listing as of Oct 26, 2026. It was last listed on Oct 2, 2026.
Certified figures
- Storage volume
- 96gallons
- UEF
- 0.57Uniform energy factor
- First-hour rating
- 128gallonsHot water in the first hour
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Change your hourProduct history
Rheem G100-80 left the DOE listing between Oct 2, 2026 and Oct 17, 2026.
Rheem G100-80 was in the DOE listing by Oct 2, 2026.
Advertised and certified figures
| Figure | Advertised | Certified | Advertiser | Read |
|---|---|---|---|---|
| Size | 100 gal, nominal size | 96 gal storage volume | Rheem | Read Oct 4, 2026 |
| Size | 100 gal, nominal size | 96 gal storage volume | The Home Depot | Archived copy, Aug 14, 2024 |
| First-hour rating | 148 gal | 128 gal | The Home Depot | Archived copy, Aug 14, 2024 |
Certified figures by listed model
| Model number | Storage volume (gal) | UEF | First-hour rating (gal) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|---|
| G100-80 | 96 | 0.57 | 128 | 74% | — |
UEF is the uniform energy factor. A dash means the model has no such figure.
It holds 96 gallons in the test, 4 gallons less than its 100-gallon sold size. Over one hour from a full tank, it gave 128 gallons in the test (its first-hour rating). Its tank holds 96 gallons, so reheating adds 32 gallons during the first hour.
In tests, 57% of the energy went to hot water, so its UEF is 0.57. The water took in 74% of the energy used to reheat it (its recovery efficiency).
Not covered
- Changes to an advertised figure after the date beside it.