AT-K5U-OS Installation Manual And Owner's Manual Brandname: Takagi Category: Water Heater Total Pages: 64 Table of contents Contents2InstallationManual3Specifications4Introduction5SafetyGuidelines6Installation7ForIndoorModels13-CombustionAirSupply-15-ClearancesFor24-General-26-NaturalGasSupplyPiping-27-Installation-30Applications35InitialOperation37