Stackless Top Return Header Pressure Switch Pressure Switch Bezel Dial Plate Pilot Orifice Pilot Pilot Mounting Bracket/Tube Hi-Tension Wire Burner Pilot Pilot Mounting Bracket Pilot Generator Pilot Orifice Combination Valve Door Assembly Refractory Block Kit Ignition Control Transformer Wiring Box Upper Jacket Control Panel Access Panel Heat Exchange Tube Tube Bundle Inlet/Outlet Header Sensor Well PRV 125 PSi Baffle Kit Flue Collector Jacket Top Outdoor Stack w/ Adapter Drafthood (Indoor) Inlet/Outlet Header Flange Gasket Inlet/outlet flange Ignition Control Upper Jacket Control Panel Burner Tray w/Burners Door Assembly Thermal Fuse Combination Valve Burner Burner Orifice Rocker Switch Thermostat Knob Knobstop Dial Plate Bezel Thermostat Control Pilot Pilot Generator Pilot Mounting Bracket Pilot Orifice Pilot Mounting Bracket/Tube Pilot Pilot Orifice Hi-Tension Wire Inlet/outlet flange Flange Gasket Inlet/Outlet Header Drain Valve High Limit 135f Drafthood (Indoor) UG Retainer Spring Unitherm Governer N/A Outdoor Stack w/ Adapter Stackless Top PRV 125 PSi Jacket Top Well Retaining Clip Sensor Well Inlet/Outlet Header Header Gasket Flue Collector Bypass Valve Hight Limit 140f Tube Bundle Bypass Spring Access Panel Baffle Kit Heat Exchange Tube Carriage/Bolt Stud Kit Return Header Bypass Spring Pressure Switch Pressure Switch Wiring Box Refractory Block Kit Transformer Go Back Heat Exchanger