Ruud RTG-84XLN-1
- Gas tankless water heater
- 2 listed models
Not listed as ENERGY STAR certified on Oct 26, 2026.
Its figures are also listed under Richmond RTG-84XLN-1.
Certified figures
- Flow at a 67°F rise
- 4.5gallons per minute
- UEF
- 0.81Uniform energy factor
Your fixtures at once
Change your hour and flowFlow where you live
The heater gives less flow when colder incoming water needs a bigger rise.
- Cold water
- Cold water must be at least 10°F colder than the hot water setting.
- Flow estimate
- The estimate uses the lowest certified flow among the listed models. It is about 4.3 gal/min at a 70°F rise.
Flow limits
- The estimate excludes the flow needed to turn the heater on, heat lost in pipes, and installation.
- Cold water from a well or long pipe run can differ from the temperature you enter.
- Without a stated flow limit, estimates for warmer water may exceed the heater’s actual flow.
Certified figures by listed model
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| RUTG-84XLN-1 | 0.81 | 4.5 | 83% | High |
| RUTG-84XLNWA-1 | 0.81 | 4.5 | 83% | High |
UEF is the uniform energy factor. A dash means the model has no such figure.
It warms 4.5 gallons per minute of water from 58°F to 125°F in the test. The median gas tankless model heats 4.8 gallons per minute by 67°F. Among 487 gas tankless models, 319 give more flow at a 67°F rise.
It was not listed as ENERGY STAR certified on Oct 26, 2026. In the test, 19% of its energy does not reach the hot water (UEF 0.81). Its test ran at the high level of daily hot water use. Of 399 gas tankless models with the same draw pattern, 327 have a higher UEF. For its type and draw pattern, the UEF runs from 0.81 to 0.98. Of the energy it spends heating water, 83% ends up in it (its recovery efficiency).
Its 2 model numbers are RUTG-84XLN-1 and RUTG-84XLNWA-1. There is one more basic model with the same test figures. That one is listed under the Richmond brand. For the full group, see the Richmond RTG-84XLN-1 page.
Also listed as
They carry every figure in the table above.
- Every Ruud basic model
- Every gas tankless water heater certified at 4.0 to 4.9 gallons per minute
- Every gas tankless water heater
- The most-searched gas tankless models side by side
Not covered
- Advertised figures. We have none on file for this model.