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American T-H3J-OS-N 1**

American T-H3J-OS-N 1** is in the DOE listing as of Oct 19, 2026. American T-H3J-OS-N 1** is in the ENERGY STAR list as of Oct 19, 2026.

  • Gas tankless water heater
  • 4 listed models

Its figures are also listed under A. O. Smith T-H3J-OS-N 1**.

Flow at a 67°F rise
4.7gallons per minuteCertified
Advertised flow
4.7gallons per minuteAmerican, at a 67°F rise
UEF
0.95Uniform 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 4.5 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 T-H3J-OS-N 1**: advertised and certified
American T-H3J-OS-N 1**: advertised and certified UEF: advertised 0.95, certified 0.95. Flow: advertised 4.7 gal/min, certified 4.7 gal/min (advertised at a 67°F rise, certified at a 67°F rise). UEF Advertised 0.95 Certified 0.95 Flow · advertised at a 67°F rise, certified at a 67°F rise Advertised 4.7 gal/min Certified 4.7 gal/min
FigureAdvertisedCertifiedAdvertiserRead
UEF 0.95 0.95 American Read Oct 4, 2026
Flow 4.7 gal/min at a 67°F rise 4.7 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-240-NEH 1**0.954.796%High
GT-240-PEH 1*10.954.796%High
GT-240X3-NEH 1**0.954.796%High
GT-240X3-PEH 1*10.954.796%High

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

ENERGY STAR certified models

Model numberUEFFlow at a 67°F rise (gal/min)
GT-240-NEH 1**0.954.7
GT-240-PEH 1*10.954.7
GT-240X3-NEH 1**0.954.7
GT-240X3-PEH 1*10.954.7

It warms 4.7 gallons per minute of water from 58°F to 125°F in the test. The median gas tankless model heats 4.8 gallons per minute by 67°F. Of 487 gas tankless models, 252 have a higher flow than this one.

It has 4 model numbers that are ENERGY STAR certified. In tests, 95% of the energy went to hot water, so its UEF is 0.95. The daily hot water use in the test, called its draw pattern, was high. Of 399 gas tankless models with the same draw pattern, 49 have a higher UEF and 217 a lower one. A UEF of 0.93 is the median for its type and draw pattern. Of the energy it spends heating water, 96% ends up in it (its recovery efficiency).

It is sold under 4 model numbers in all. All of its test figures are shared by 5 other basic models. Each of the 5 other brands lists one of them. For the full group, see the A. O. Smith T-H3J-OS-N 1**.

In 7 states, 6 rebate programs may accept it. It may qualify for 2 more if it meets terms its figures do not show.

Also listed as

They carry every figure in the table above.

Rebates

ProgramStateStatusProgram page
SoCalGas High-Efficiency or ENERGY STAR Certified Natural Gas Tankless Water Heaters rebate CA May qualify Its own page
Colorado Springs Utilities Water heater rebate (gas storage, gas tankless) CO May qualify Its own page
Nicor Gas Energy Efficiency Rebates for Your Home (gas tankless) IL May qualify if it meets the other terms Its own page
DTE Energy Water Heaters (gas storage, gas tankless) MI May qualify Its own page
Xcel Energy MINNESOTA RESIDENTIAL ENERGY EFFICIENCY PROGRAMS (gas storage, gas tankless) MN May qualify Its own page
PSE&G Tankless Water Heaters NJ May qualify Its own page
Energy Trust of Oregon Residential Incentives OR, WA May qualify Its own page
Focus on Energy (gas tankless) WI May qualify if it meets the other terms Its own page

Programs change their terms. Check the program's own page before you buy.

Updated Oct 19, 2026 · Methodology

Not covered

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