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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