eyoo EO8K-W
eyoo EO8K-W is in the DOE listing as of Oct 26, 2026.
It has a certified UEF of 0.82 and a certified flow of 3.2 gal/min at a 67°F rise.
- Gas tankless water heater
- 1 listed model
Not listed as ENERGY STAR certified on Oct 26, 2026.
Certified figures
- Flow at a 67°F rise
- 3.2gallons per minute
- UEF
- 0.82Uniform 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 3.1 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 |
|---|---|---|---|---|
| EO8K-W | 0.82 | 3.2 | 84% | Medium |
UEF is the uniform energy factor. A dash means the model has no such figure.
It warms 3.2 gallons per minute of water from 58°F to 125°F in the test. The gas tankless type has a median flow of 4.8 gallons per minute. Among 487 gas tankless models, 462 give more flow at a 67°F rise.
It was not listed as ENERGY STAR certified on Oct 26, 2026. In tests, 82% of the energy went to hot water, so its UEF is 0.82. Its test simulated a day of medium hot water use (its draw pattern). Of 77 gas tankless models with the same draw pattern, 30 have a higher UEF. On its draw pattern, its UEF is also the median gas tankless UEF. While it heats water, 84% of the energy used goes into the water (its recovery efficiency).
Its test figures match those of one other basic model. That one carries the Ranein brand name.
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 eyoo basic model
- Every gas tankless water heater certified below 4.0 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.