A.O. Smith

110-U Model 140 MBH Outdoor Natural Gas Tankless Water Heater

Part #AATO110U00N000000  |  Manufacturer Part #100227698

Fuel Type:

Natural Gas
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Product Details

  • Fully modulating, gas fired, tankless water heater with sealed combustion and power vented flue
  • Indoor and outdoor models available for residential applications
  • Supplies hot water to domestic hot water systems and can be used with water storage tanks, recirculation systems, and/or combined domestic and heating applications


ANSI Specifications: ANSI Z21.10.3

Application: Residential

BTU: 140000

CARB OTC LEED Compliant: No

CEC Compliant: For Sale in CA

CSA Certified: Yes

Collection: 110-U Model

Depth: 10 in

End Connection 1: NPT

End Connection 2: NPT

End Connections: NPT

Energy Star Compliant: Yes

Flow Rate: 6.6 gpm

Fuel Type: Natural Gas

GSA Approved: No

Green: [Yes, Energy Star]

Height: 20-1/2 in

Ignition System: Electronic Ignition

Indoor Outdoor: Outdoor

Installation Type: [Wall Mount, Vertical Mount]

MBH: 140

Maximum Pressure: 150 psi

NSF Certified: No

Origin: Domestic

Power Source: Gas

Supply Pipe Connection: 3/4 in

UL Listed: No

Vent Type: Direct Vent

Volts: 120V

Water Heater Type: Tankless

Weight: 38

Width: 13-3/4 in