Rheem SPEX90T
Rheem SPEX90T is in the DOE listing as of Oct 26, 2026.
It has a certified UEF of 0.98 and a certified flow of 0.9 gal/min at a 67°F rise.
Its certified flow is 0.9 gal/min at a 67°F rise, while Rheem advertises 3.0 gal/min, no rise stated (Read Oct 5, 2026), so a comparison at the same rise is not possible.
- Electric tankless water heater
- 1 listed model
ENERGY STAR certification does not cover this type of water heater.
Certified and advertised figures
- Flow at a 67°F rise
- 0.9gallons per minuteCertified
- Advertised flow
- 3.0gallons per minuteRheem, no rise stated
- UEF
- 0.98Uniform 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 0.9 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 |
|---|---|---|---|---|
| Flow | 3.0 gal/min, no rise stated | 0.9 gal/min at a 67°F rise | Rheem | Read Oct 5, 2026 |
Certified figures by listed model
| Model number | UEF | Flow at a 67°F rise (gal/min) | Recovery efficiency | Draw pattern |
|---|---|---|---|---|
| RTEH90T | 0.98 | 0.9 | 98% | Very small |
UEF is the uniform energy factor. A dash means the model has no such figure.
It warms 0.9 gallons per minute of water from 58°F to 125°F in the test. The electric tankless type has a median flow of 0.7 gallons per minute. Its flow at a 67°F rise trails 114 of the 337 electric tankless models.
In the test, 2% of its energy does not reach the hot water (UEF 0.98). Its test ran at the very small level of daily hot water use. Among 272 electric tankless models on its draw pattern, 10 have a higher UEF. For its type and draw pattern, the median UEF is 0.96. While it heats water, 98% of the energy used goes into the water (its recovery efficiency).
There are 5 more basic models with the same test figures. The EEMAX and KWICKSHOT brands list one or more of them.
Also listed as
They carry every figure in the table above.
- Every Rheem basic model
- Every electric tankless water heater certified below 1.0 gallon per minute
- Every electric tankless water heater
Not covered
- Changes to an advertised figure after the date beside it.