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ENVO WH-AZ02-199-NGI

ENVO WH-AZ02-199-NGI is in the DOE listing as of Oct 26, 2026.

It has a certified UEF of 0.81 and a certified flow of 4.9 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
4.9gallons per minute
UEF
0.81Uniform energy factor
See it among every gas tankless model

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 4.7 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-AZ02-199-NGI0.814.985%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 4.9 gallons per minute. The median flow among gas tankless models is 4.8 gallons per minute. Of 487 gas tankless models, 210 have a higher flow than this one.

As of Oct 26, 2026, it was not listed as ENERGY STAR certified. In tests, 81% of the energy it uses ends up as hot water (UEF 0.81). Its test ran at the high level of daily hot water use. 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. Of the energy it spends heating water, 85% ends up in it (its recovery efficiency).

Updated Oct 26, 2026 · Methodology

Not covered

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