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  • ENERGY STAR Certified
    Water Heaters

    Water heaters that earn the ENERGY STAR come with gas, solar or electric heat pump technology. They heat your water just like standard models but with much less energy, saving you up to $3500 over a unit’s lifetime.

Learn what to look for when buying and installing an ENERGY STAR certified water heater.

See buying guidance for:

A. O. Smith - T-H3-OS-N 1** : TK-540X3-NEH 1**Model Number Information

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ENERGY STAR Unique IDField details: 2382509
ENERGY STAR PartnerField details: A.O. Smith Corporation
TypeField details: Gas Tankless
FuelField details: Natural Gas
Water Heater Depth (inches)Field details: 11.0
Water Heater Height (inches)Field details: 22.0
Water Heater Width (inches)Field details: 18.0
Vent Size 1 (inches)Field details: 3
Max. Input Rate for Gas Products (Btu/hr)Field details: 199000
Uniform Energy Factor (UEF)Field details: 0.95
Therms Per Year at 125°F outlet tempField details: 178
Maximum Gallons Per Minute over 67°F riseField details: 5.8
Minimum Gallons Per Minute over 67°F riseField details: 5.8
Date CertifiedField details: 11/09/2021
MarketsField details: United States, Canada
ENERGY STAR CertifiedField details: Yes
ENERGY STAR Most Efficient: No

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