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EEMAX SPEX4208

EEMAX SPEX4208 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 SPEX4208.

Flow at a 67°F rise
0.4gallons per minute
UEF
0.97Uniform energy factor
See it among every electric tankless model

Flow 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 0.4 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

EEMAX SPEX4208: advertised and certified
EEMAX SPEX4208: advertised and certified Flow: advertised 0.6 gal/min, certified 0.4 gal/min (advertised at a 50°F rise, certified at a 67°F rise). Flow: advertised 0.5 gal/min, certified 0.4 gal/min (advertised at a 40°F rise, certified at a 67°F rise). Flow: advertised 0.5 gal/min, certified 0.4 gal/min (advertised at a 60°F rise, certified at a 67°F rise). Flow: advertised 0.4 gal/min, certified 0.4 gal/min (advertised at a 70°F rise, certified at a 67°F rise). Flow · advertised at a 50°F rise, certified at a 67°F rise Advertised 0.6 gal/min Certified 0.4 gal/min Flow · advertised at a 40°F rise, certified at a 67°F rise Advertised 0.5 gal/min Certified 0.4 gal/min Flow · advertised at a 60°F rise, certified at a 67°F rise Advertised 0.5 gal/min Certified 0.4 gal/min Flow · advertised at a 70°F rise, certified at a 67°F rise Advertised 0.4 gal/min Certified 0.4 gal/min
FigureAdvertisedCertifiedAdvertiserRead
Flow 0.6 gal/min at a 50°F rise 0.4 gal/min at a 67°F rise SupplyHouse Archived copy, Jan 30, 2023
Flow 0.5 gal/min at a 40°F rise 0.4 gal/min at a 67°F rise SupplyHouse Archived copy, Jan 30, 2023
Flow 0.5 gal/min at a 60°F rise 0.4 gal/min at a 67°F rise SupplyHouse Archived copy, Jan 30, 2023
Flow 0.4 gal/min at a 70°F rise 0.4 gal/min at a 67°F rise SupplyHouse Archived copy, Jan 30, 2023

Certified figures by listed model

Model numberUEFFlow at a 67°F rise (gal/min)Recovery efficiencyDraw pattern
SPEX42080.970.497%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 0.4 gallons per minute. The electric tankless type has a median flow of 0.7 gallons per minute. Of 337 electric tankless models, 233 have a higher flow than this one.

In tests, 97% of the energy it uses ends up as hot water (UEF 0.97). The daily hot water use in the test, called its draw pattern, was very small. Of 272 electric tankless models with the same draw pattern, 37 have a higher UEF and 195 a lower one. A UEF of 0.96 is the median for its type and draw pattern. While it heats water, 97% of the energy used goes into the water (its recovery efficiency).

All of its test figures are shared by 2 other basic models. Of those, one or more are under the KWICKSHOT and Rheem brands. You can find the whole group on the page for the Rheem SPEX4208.

Also listed as

They carry every figure in the table above.

Updated Oct 19, 2026 · Methodology

Not covered

  • Changes to an advertised figure after the date beside it.