Rheem RTG-84XLN-3
Rheem RTG-84XLN-3 is in the DOE listing as of Oct 26, 2026.
It has a certified UEF of 0.82 and a certified flow of 4.4 gal/min at a 67°F rise.
Its certified flow is 4.4 gal/min at a 67°F rise, while Rheem advertises 8.4 gal/min, no rise stated (Read Oct 4, 2026), so a comparison at the same rise is not possible.
- Gas tankless water heater
- 4 listed models
Not listed as ENERGY STAR certified on Oct 26, 2026.
Certified and advertised figures
- Flow at a 67°F rise
- 4.4gallons per minuteCertified
- Advertised flow
- 8.4gallons per minuteRheem, no rise stated
- UEF
- 0.82Uniform energy factor
Your fixtures at once
Change your hour and flowFlow where you live
A bigger rise from colder incoming water leaves the heater with less flow.
- 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 4.2 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.
Advertised and certified figures
| Figure | Advertised | Certified | Advertiser | Read |
|---|---|---|---|---|
| UEF | 0.82 | 0.82 | The Home Depot | Archived copy, Aug 16, 2025 |
| Flow | 8.4 gal/min, no rise stated | 4.4 gal/min at a 67°F rise | Rheem | Read Oct 4, 2026 |
| Flow | 8.4 gal/min at a 35°F rise | 4.4 gal/min at a 67°F rise | The Home Depot | Archived copy, Aug 16, 2025 |
| Flow | 6.7 gal/min at a 45°F rise | 4.4 gal/min at a 67°F rise | The Home Depot | Archived copy, Aug 16, 2025 |
Certified figures by listed model
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| ECO180XELN-3 | 0.82 | 4.4 | 85% | High |
| ECO180XELP-3 | 0.82 | 4.4 | 85% | High |
| RTG-84XLN-3 | 0.82 | 4.4 | 85% | High |
| RTG-84XLP-3 | 0.82 | 4.4 | 85% | High |
UEF is the uniform energy factor. A dash means the model has no such figure.
At a 67°F rise, its flow in the test is 4.4 gallons per minute. The median gas tankless model heats 4.8 gallons per minute by 67°F. Of 487 gas tankless models, 339 have a higher flow than this one.
As of Oct 26, 2026, it was not listed as ENERGY STAR certified. In the test, 18% of its energy does not reach the hot water (UEF 0.82). Its test simulated a day of high hot water use (its draw pattern). Among 399 gas tankless models on its draw pattern, 243 have a higher UEF. For its type and draw pattern, the UEF runs from 0.81 to 0.98. When it runs, 85% of the energy it uses reaches the water (its recovery efficiency).
It is sold under 4 model numbers in all. There are 3 more basic models with the same test figures. Of those, one or more are under the Friedrich, Richmond, and Ruud brands.
It may qualify for one rebate program if it meets their other terms.
Also listed as
They carry every figure in the table above.
Rebates
| Program | State | Status | Program page |
|---|---|---|---|
| SoCalGas High-Efficiency or ENERGY STAR Certified Natural Gas Tankless Water Heaters rebate | CA | May qualify if it meets the other terms | Its own page |
Programs change their terms. Check the program's own page before you buy.
- Every Rheem 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
- Changes to an advertised figure after the date beside it.