Manualshelf

Installation Guide

ManualsBrandsA.O. Smith ManualsTankless Gas Water HeatersGT15-310U-O
12345678910
Gas Tankless Water Heater
TM
Suitable for combination potable water heating
and space-heating
Please refer to local codes
for space-heating compliance.
FEATURING
• ENDLESSHOTWATER
• ON-DEMANDUSAGE
• COMPACT,SPACESAVING
• ENERGYCONSERVATION
• COMPUTERIZEDSAFETY
• NOPILOTLIGHT
• ComplieswithSCAQMDRule
1146.2forNOxemissionsrequire-
mentof14ng/Jor20ppm
• FIELDGASCONVERTIBLE
• EASY-LINK SYSTEM AND MULTI-
UNITSYSTEM
(510U 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
On-Demand Water Heater
Installation Manual and Owner’s Guide
Keep this manual near the water heater for future reference whenever maintenance, adjustment, or
serviceisrequired.
ANSI Z21.10.3 ・ CSA 4.3
510U only
Models
• 110U Outdoor
• 310U Outdoor
• 510U Outdoor
• 110U Indoor
• 310U Indoor
• 510U Indoor
Series 200
- 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.
WARNING
If the information in these
instructions is not followed
exactly,afireorexplosionmay
resultcausingpropertydamage,
personal injury or death.

Summary of content (60 pages)