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Ariston AURES PRO 27 240V US

Ariston AURES PRO 27 240V US is in the DOE listing as of Oct 26, 2026.

It has a certified UEF of 0.93 and a certified flow of 2.5 gal/min at a 67°F rise.

  • Electric tankless water heater
  • 1 listed model

ENERGY STAR certification does not cover this type of water heater.

Flow at a 67°F rise
2.5gallons per minute
UEF
0.93Uniform energy factor

Flow 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 2.4 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.

Certified figures by listed model

Model numberUEFFlow at a 67°F rise (gal/min)Recovery efficiencyDraw pattern
AURES PRO 27 240V US0.932.597%—

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 2.5 gallons per minute. The median flow among electric tankless models is 0.7 gallons per minute. Its flow at a 67°F rise trails 13 of the 337 electric tankless models.

In the test, 7% of its energy does not reach the hot water (UEF 0.93). Of the energy it spends heating water, 97% ends up in it (its recovery efficiency).

All of its test figures are shared by one other basic model. The brand name on that one is Bosch.

Also listed as

They carry every figure in the table above.

Updated Oct 26, 2026 · Methodology

Not covered

  • Advertised figures. We have none on file for this model.