ProLine® XE Ultra-Low NOx Outdoor 120,000 BTU Condensing Natural Gas Tankless Water Heater

Model ATO-140H
3.8 out of 5 Customer Rating
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Installation Type
Fuel Source
Maximum BTU's

  • Continuous flow rate up to 6.6 GPM
  • Wall-mount design saves valuable space and allows for additional storage and flexibility
  • Primary commercial-grade copper heat exchanger is 25x better than stainless steel at heat transfer, stabilizing outgoing water temperatures quicker
  • Product Details
    • Continuous flow rate up to 6.6 GPM
    • Wall-mount design saves valuable space and allows for additional storage and flexibility
    • Primary commercial-grade copper heat exchanger is 25x better than stainless steel at heat transfer, stabilizing outgoing water temperatures quicker
    • Secondary heat exchanger is made of 316L Stainless Steel to protect against corrosion
    • Highly efficient condensing Ultra-Low Nox tankless water heater delivers up to .91 Uniform Energy Factor (UEF)
    • Vents with 3” PVC up to 70 feet or 4" PVC up to 100 feet
    • Includes integrated temperature controls and advanced diagnostics to simplify troubleshooting
    • Safety features include exhaust & water temperature safety control, overheat cut-off fuse and air-fuel ratio (AFR) sensor
    • 15-year limited warranty on heat exchanger in residential applications

    • The 140H Series offers high efficiency Ultra-Low NOx condensing technology allowing for the use of 3” PVC venting and has 0” clearance to combustibles. Indoor models are certified up to 10,100 ft. altitude. Provides a variety of installation options: indoor, outdoor and direct vent. Complies with Ultra-Low NOx regulations and meets the energy efficiency requirements of ASHRAE 90.1b-1992. The ATO-140H-N tankless water heater uses up to 120,000 BTUs of natural gas to deliver a max flow rate of 6.6 GPM. It utilizes condensing technology to achieve a Uniform Energy Factor of 0.91. this model meets Ultra-Low NOx emission requirements, and comes with a 15-year limited warranty. A. O. Smith’s ProLine® water heaters are residential products built to commercial-grade standard and are only available for purchase through professional wholesalers and contractors.

    Specifications
    Tech Specs
    UEF
    0.91
    Maximum BTUs
    120,000
    Power Source
    GAS
    Limited Parts Warranty
    5 Years
    Water Connection Location
    BOTTOM
    Emissions
    Low NOx
    ASME Certified
    No
    LEED Rating
    1.50
    Destination Country
    US
    Fuel Source
    NATURAL
    Installation Type
    OUTDOOR
    Limited Heat Exchanger Warranty 
    15 Years
    Max Flow Rate
    3.50
    Minimum BTUs
    15,000.00
    Application
    RESIDENTIAL
    Product Tier
    ProLine® XE
    Shipping Height 
    29.5
    Shipping Length 
    17.75
    Shipping Width 
    13.125
    Side Loop
    No
    Dimension & Venting
    Type
    Water Heater
    Height
    22.875"
    Width
    13.87"
    Shipping Weight
    52lbs
    Vent Type
    Power Direct Vent
    Find a Replacement
    Current Product
    Option 2
    ProLine® XE Ultra-Low NOx Outdoor 120,000 BTU Condensing Natural Gas Tankless Water Heater
    ProLine® XE Ultra-Low NOx Outdoor 160,000 BTU Condensing Natural Gas Tankless Water Heater
    ATO-140H
    ATO-240H
    Rebates up to $300 +
    Rebates up to $300 +
    Width
    13.87"
    17.75"
    Depth
    10.81"
    11.25"
    Height
    22.875"
    23.63"
    Shipping Weight
    52lbs
    69lbs
    Power Source
    GAS
    GAS
    Limited Tank Warranty
    0 Years
    0 Years
    Limited Parts Warranty
    5 Years
    5 Years
    Water Connection Location
    BOTTOM
    BOTTOM
    Water Connection Size
    0.75"
    Thermal Efficiency
    0%
    0%
    All Reviews for ProLine® XE Tankless Condensing (100 series)
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