Ruud G100-80
- 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.
Its figures are also listed under Rheem G100-80.
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
Ruud G100-80 left the DOE listing between Oct 2, 2026 and Oct 17, 2026.
Ruud 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 | Ruud | Read Oct 4, 2026 |
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. Starting full, it gives 128 gallons of hot water in its first hour of use. That is 32 gallons more than its tank holds, since it reheats during the hour.
In the test, 43% of its energy does not reach the hot water (UEF 0.57). When it reheats water in the test, 74% of the energy it uses ends up in the water.
For the full group, see the Rheem G100-80 page.
Not covered
- Changes to an advertised figure after the date beside it.