For installation in non-occupied area. Direct pipe system. Does not include vent kit. Convertible fuel control, standard atmospheric draft hood and venting system, shipped with necessary parts to setup either natural or propane gas. Electronic gas control valve provides precise temperature control and operational status. Piezo igniter allows safe and easy 1-hand pilot ignition. Meets or exceeds NAECA (National Appliance Energy Conservation Act) requirements, glass lined, factory installed T & P (temperature and pressure) valve. Polymer-lined nipples allow easy water connection hook up. D-rated to 5,400 Ft. elevation. Premium grade anode rod, 2 In. insulation. For manufactured home (Mobile Home) use only.