• Tankless

    When it comes to high efficiency tankless water heaters, no one comes close to matching the expertise and innovation of A. O. Smith. With higher efficiency ratings and groundbreaking designs, our tankless water heaters feature non-condensing and condensing technology and are part of a new era in water heating.

    • All condensing models are ENERGY STAR® qualified
    • Ultra-Low NOx options are available

  • Tankless Water Heaters

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    Flow Rate
    BTU Input
    Limited Warranty - Heat Exchanger
    Features
    Technology
    Emissions
    Fuel Type
    Location
    Energy Factor (EF)
    Weight

    Tankless Water Heater Non-Condensing Indoor 140,000 BTU Propane

    ATI-110-P
    • 15 Year Limited Warranty
    • 140,000 BTU

    Tankless Water Heater Non-Condensing Indoor 199,000 BTU Natural Gas

    ATI-510-N
    • 15 Year Limited Warranty
    • 199,000 BTU

    Find a Professional

    A. O. Smith water heaters are available through your local plumbing professional. Find one near you.


    Tankless Water Heater Non-Condensing Indoor 190,000 BTU Natural Gas

    ATI-310-N
    • 15 Year Limited Warranty
    • 190,000 BTU

    Tankless Water Heater Non-Condensing Indoor 140,000 BTU Natural Gas

    ATI-110-N
    • 15 Year Limited Warranty
    • 140,000 BTU

    Tankless Water Heater Non-Condensing Outdoor 199,000 BTU Natural Gas

    ATO-510-N
    • 15 Year Limited Warranty
    • 199,000 BTU

    Find a Professional

    A. O. Smith water heaters are available through your local plumbing professional. Find one near you.


    Tankless Water Heater Non-Condensing Outdoor 190,000 BTU Natural Gas

    ATO-310-N
    • 15 Year Limited Warranty
    • 190,000 BTU
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