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ENVO WH-AZ01-180-NGI

ENVO WH-AZ01-180-NGI is in the DOE listing as of Oct 26, 2026.

It has a certified UEF of 0.81 and a certified flow of 4.3 gal/min at a 67°F rise.

  • Gas tankless water heater
  • 1 listed model

Not listed as ENERGY STAR certified on Oct 26, 2026.

Flow at a 67°F rise
4.3gallons per minute
UEF
0.81Uniform energy factor
See it among every gas 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 4.1 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
WH-AZ01-180-NGI0.814.385%High

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 4.3 gallons per minute. The median flow among gas tankless models is 4.8 gallons per minute. Of 487 gas tankless models, 346 have a higher flow than this one.

On Oct 26, 2026, this heater was not listed as ENERGY STAR certified. In tests, 81% of the energy it uses ends up as hot water (UEF 0.81). The daily hot water use in the test, called its draw pattern, was high. Among 399 gas tankless models on its draw pattern, 327 have a higher UEF. On its draw pattern, the median gas tankless UEF is 0.93. While it heats water, 85% of the energy used goes into the water (its recovery efficiency).

Updated Oct 26, 2026 · Methodology

Not covered

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