Potential dangers from accidents during installation and use are divided into the following threecategories. Closely observe these warnings, they are critical to your safety.Prohibited DisconnectPower Ground Be sure to doWARNING: If the information in this manual is not followed exactly, a fire or explosion may resultcausing property damage, personal injury or death.NORITZ AMERICACORPORATIONInstallation ManualCONDENSING TANKLESS GAS WATER HEATERNCC199OD (GQ-C3257WZ US) (Outdoor Installation)DANGER indicates an imminently hazardous situation which,if not avoided, will result in death or serious injury.WARNING indicates a potentially hazardous situation which,if not avoided, could result in death or serious injury.CAUTION indicates a potentially hazardous situation which,if not avoided, may result in minor or moderate injury.DANGERWARNINGCAUTIONSBB80HW-3Rev. 01/17Requests to Installers• In order to use the water heater safely, read this installation manual carefully, and follow theinstallation instructions.• Failures and damage caused by erroneous work or work not as instructed in this manual are notcovered by the warranty.• Check that the installation was done properly in accordance with this Installation Manual uponcompletion.• After completing installation, please either place this Installation Manual in a plastic pouch andattach it to the side of the water heater (or the inside of the pipe cover or recess box if applicable),or hand it to the customer to retain for future reference. Also, be sure to fill in all of the requireditems on the warranty and to hand the warranty to the customer along with the Owner's Guide.CAUTIONFOR USE IN COMMERCIAL OR MANUFACTURED HOME APPLICATIONS.Installation must conform with local codes, or in the absence oflocal codes, the National Fuel Gas Code, ANSI Z223.1/NFPA 54-latest edition and/or the Natural Gas and Propane InstallationCode CSA B149.1 - latest edition.When applicable, installation must conform with the ManufacturedHome Construction and Safety Standard, Title 24 CFR, Part3280 or the Canadian Standard CAN/CSA-Z240 MH MobileHomes, Series M86.Noritz America reserves the right to discontinue, or change at anytime, the designs and/or specifications of its products without notice.CERTIFIED RLow NOx Approved by SCAQMD14 ng/J or 20 ppm(Natural Gas Only)