Rheem SPEX3512T
Rheem SPEX3512T 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 SPEX3012T.
Certified and advertised figures
- Flow at a 67°F rise
- 0.3gallons 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
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 0.3 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.
Advertised and certified figures
| Figure | Advertised | Certified | Advertiser | Read |
|---|---|---|---|---|
| Flow | 2.0 gal/min, no rise stated | 0.3 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 |
|---|---|---|---|---|
| RTEH3512T | 0.96 | 0.3 | 98% | Very small |
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 0.3 gallons per minute. The median flow among electric tankless models is 0.7 gallons per minute. Its flow at a 67°F rise trails 271 of the 337 electric tankless models.
In tests, 96% of the energy it uses ends up as hot water (UEF 0.96). Its test ran at the very small level of daily hot water use. Of 272 electric tankless models with the same draw pattern, 77 have a higher UEF and 121 a lower one. Its UEF is the median for its type and draw pattern. Of the energy it spends heating water, 98% ends up in it (its recovery efficiency).
There are 5 more basic models with the same test figures. Those basic models are sold with Aquapower, EEMAX, and Stiebel Eltron as their brand names. You can find the whole group on the page for the Rheem SPEX3012T.
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.