Section 8 AAC 80.050 - Boiler and pressure vessel inspection standards: installation; combination boiler-water heater units(a) The portion of the most current addition of the National Board Inspection Code Manual for Boiler and Pressure Vessel Inspectorsaddressing installation must be used as a guideline if the manufacturer's recommendation is not available.(b) A combination boiler-water heater unit must comply with the standards of the most current edition of the National Board Inspection Code Manual for Boiler and Pressure Vessel Inspectorsthat are applicable to both boilers and water heaters, with the most stringent standard to be applied in the event of a conflict between standards.Eff. 9/27/2008, Register 187