A.O. Smith ATO-340H-P Technical Documents

A.O. Smith Water Heater Technical Documents - ATO-340H-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.

540 (T-H3) 

models only

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

 • Donottrytolightanyappliance.

 • Donottouchanyelectricswitch,donot

use any phone in your building.

 • Immediatelycallyourgassupplierfrom

a neighbor's phone. Follow the gas 

supplier's instructions.

 • Ifyoucannotreachyourgassupplier,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

• ENDLESSHOTWATER

• ON-DEMANDUSAGE

• COMPACT,SPACESAVING

• ENERGYCONSERVATION

• COMPUTERIZEDSAFETY

• NOPILOTLIGHT

• Satisfiesthe2012SCAQMDRule

                        1146.2 for Ultra-Low NOx 

                        Emissions

• EASY-LINKSYSTEMAND

                       MULTI-UNIT SYSTEM

  

(540 (T-H3) models only)

Models

• 240 Outdoor (T-H3J-OS)

• 340 Outdoor (T-H3S-OS)

• 540 Outdoor (T-H3-OS)

• 240 Indoor (T-H3J-DV)

• 340 Indoor (T-H3S-DV)

• 540 Indoor (T-H3-DV)

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