A.O. Smith

On-Demand Tankless 199 MBH Indoor Condensing Propane Water Heater

Part #AATI540H00P000000  |  Manufacturer Part #100123440

Fuel Type:

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Product Details

  • Continuous maximum flow rates up to 10.0 gpm
  • Energy Star® qualified
  • Easily convertible from natural gas to propane with supplied kit
  • Includes integrated temperature controls and advanced diagnostics to simplify troubleshooting
  • Primary heat exchanger is constructed of HRS35, a commercial grade copper that is more resilient to erosion
  • Internal freeze protection system
  • Fifteen-year limited warranty on heat exchanger in residential applications, 10-year limited warranty on heat exchanger in commercial applications, 5-year limited warranty on all parts


ANSI Specifications: ANSI Z21.10.3

Application: Residential

BTU: 199000

CARB OTC LEED Compliant: No

CEC Compliant: For Sale in CA

CSA Certified: CSA 4.3

Collection: On-Demand Tankless

Condensing: Yes

Depth: 11-1/4 in

End Connection 1: NPT

End Connections: NPT

Energy Star Compliant: Yes

Flow Rate: 10 gpm

Fuel Type: Propane

GSA Approved: No

Green: [Yes, Energy Star]

Height: 23-5/8 in

IAPMO Listed: No

Ignition System: Electronic Ignition

Indoor Outdoor: Indoor

MBH: 199

Maximum Pressure: 150 psi

NSF Certified: Yes

Power Source: Gas

Supply Pipe Connection: 3/4 in

UL Listed: No

Uniform Energy Factor UEF : 0.93

Vent Type: Power Direct Vent

Volts: 120V

Water Heater Type: Tankless

Width: 17-3/4 in