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American TK-310C-NI 1**

American TK-310C-NI 1** is in the DOE listing as of Oct 19, 2026.

  • Gas tankless water heater
  • 1 listed model

Not listed as ENERGY STAR certified on Oct 19, 2026.

Its figures are also listed under A. O. Smith TK-310C-NI 1**.

Flow at a 67°F rise
4.6gallons per minuteCertified
Advertised flow
10.0gallons per minuteAmerican, up to, no rise stated
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 4.4 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

American TK-310C-NI 1**: advertised and certified
American TK-310C-NI 1**: advertised and certified UEF: advertised 0.81, certified 0.81. Flow: advertised 10.0 gal/min, certified 4.6 gal/min (advertised up to, no rise stated, certified at a 67°F rise). Flow: advertised 4.6 gal/min, certified 4.6 gal/min (advertised at a 67°F rise, certified at a 67°F rise). UEF Advertised 0.81 Certified 0.81 Flow · advertised up to, no rise stated, certified at a 67°F rise Advertised 10.0 gal/min Certified 4.6 gal/min Flow · advertised at a 67°F rise, certified at a 67°F rise Advertised 4.6 gal/min Certified 4.6 gal/min
FigureAdvertisedCertifiedAdvertiserRead
UEF 0.81 0.81 American Read Oct 4, 2026
Flow up to 10.0 gal/min, no rise stated 4.6 gal/min at a 67°F rise American Read Oct 4, 2026
Flow 4.6 gal/min at a 67°F rise 4.6 gal/min at a 67°F rise American Read Oct 4, 2026

See how advertised flow compares across tankless models

Certified figures by listed model

Model numberUEFFlow at a 67°F rise (gal/min)Recovery efficiencyDraw pattern
GT-310C-NI 1**0.814.685%High

UEF is the uniform energy factor. A dash means the model has no such figure.

It heats 4.6 gallons per minute of water by 67°F in the test. The gas tankless type has a median flow of 4.8 gallons per minute. Among 487 gas tankless models, 300 give more flow at a 67°F rise.

On Oct 19, 2026, this heater was not listed as ENERGY STAR certified. In the test, 19% of its energy does not reach the hot water (UEF 0.81). Its test ran at the high level of daily hot water use. Its UEF is lower than that of 327 of the 399 gas tankless models with its draw pattern. For its type and draw pattern, the median UEF is 0.93. When it runs, 85% of the energy it uses reaches the water (its recovery efficiency).

All of its test figures are shared by 5 other basic models. Each of the 5 other brands lists one of them. You can find the whole group on the page for the A. O. Smith TK-310C-NI 1**.

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.