A.O. Smith ATI-140H-P Technical Documents

A.O. Smith Water Heater Technical Documents - ATI-140H-P.
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Gas Tankless Water HeaterTM

Suitable for potable water heating and space-heating 

Please refer to local codes for space-heating compliance.

If you have any questions, please 

call or write to: 

500 Tennessee Waltz Parkway 

Ashland City, TN 37015 

Toll Free: 1-877-737-2840

WARNING

 - Do not store or use gasoline or other 

flammable vapors and liquids in the vicinity 

of this or any other appliance.

 - WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electric switch, do not 

use any phone in your building.

• Immediately call your gas supplier from 

a neighbor's phone. Follow the gas 

supplier's instructions.

• If you cannot reach your gas supplier, call 

the fire department.

 - Installation and service must be performed 

by a qualified installer, service agency or the 

gas supplier.

On-Demand Water Heater

Installation Manual and Owner’s Guide

ANSI Z21.10.3 and CSA 4.3

If the information in these 

instructions is not followed 

exactly, a fire or explosion may 

result causing property damage, 

personal injury or death.

FEATURING

ENDLESS HOT WATER

ON-DEMAND USAGE

COMPACT, SPACE SAVING

ENERGY CONSERVATION

COMPUTERIZED SAFETY

NO PILOT LIGHT

Satisfies the 2012 SCAQMD Rule 

1146.2 for Ultra-Low NOx  

 

Emissions

Models

• 140 Outdoor (T-H3M-OS)

• 140 Indoor (T-H3M-DV)

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