AO Smith ATI-110U-N Indoor Nat. Gas/LP Ultra-Low NOx Tankless Heater


Weight: 38.00 lbs

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140,000 BTU tankless gas water heater for residential applications

The 110U Series is perfect for one bath homes, condos, apartments in cold climates and summer cabins. It includes a remote control as a standard feature, and works with a variety of installation options: outdoor, indoor, and direct vent.


• 140,000 BTUs
• Maximum flow rate of 6.6 GPM
• Non-condensing technology
• ENERGY STAR qualified
• Energy factor of 0.82
• Ultra-Low NOx (Natural Gas only): Complies with SCAQMD Rule 1146.2 for NOx emissions requirement of 14 ng/J or 20 ppm
• Field convertible from NG to LP with included gas conversion kit
• 15-year limited warranty
• Built-in freeze protection
• Manual reset hi limit (Set at 194°F)
• Overheat cutoff fuse
• Inlet and outlet thermistors for constant temperature monitoring



Emissions Ultra-Low NOx
Maximum BTUs 140,000
Minimum BTUs 15,000
Thermal Efficiency 83%
Limited Heat Exchanger Warranty 15 Years
Limited Parts Warranty 5 Years
Water Connection Location Bottom
Water Connection Size 3/4"
Heat Exchanger Copper
Voltage 120
Energy Factor 0.82
Remote Control Included
Technology Non-Condensing
Type Space Saving
Height 20 1/4"
Width 13 3/4"
Depth (Ultra Low NOx) 9 1/2"
Product Weight 33lbs/15kg
Shipping Weight 40lbs
Vent Type (Indoor models) Direct Vent
Vent Length (Indoor models) 50 feet using 4" diameter


Ultra-Low NOx Manual

Spec Sheet

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Sep 12, 2016
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