Rheem SPEX75
Rheem SPEX75 is in the DOE listing as of Oct 19, 2026.
- Electric tankless water heater
- 1 listed model
ENERGY STAR certification does not cover this type of water heater.
Its figures are also listed under Rheem AM008277T.
Certified and advertised figures
- Flow at a 67°F rise
- 0.8gallons per minuteCertified
- Advertised flow
- 2.0gallons per minuteRheem, no rise stated
- UEF
- 0.96Uniform energy factor
Your fixtures at once
Change your hour and flowFlow where you live
Colder incoming water needs a bigger rise, so the heater gives 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 0.8 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 | 2.0 gal/min, no rise stated | 0.8 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 |
|---|---|---|---|---|
| RTEH75 | 0.96 | 0.8 | 95% | Very small |
UEF is the uniform energy factor. A dash means the model has no such figure.
It heats 0.8 gallons per minute of water by 67°F in the test. The median flow among electric tankless models is 0.7 gallons per minute. Among 337 electric tankless models, 131 give more flow at a 67°F rise.
In tests, 96% of the energy it uses ends up as hot water (UEF 0.96). In the test, daily hot water use was set to very small (its draw pattern). Of 272 electric tankless models with the same draw pattern, 77 have a higher UEF and 121 a lower one. For its type and draw pattern, its UEF sits at the median. When it runs, 95% of the energy it uses reaches the water (its recovery efficiency).
There are 7 more basic models with the same test figures. The EEMAX and KWICKSHOT brands list one or more of them. For the full group, see the Rheem AM008277T page.
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.