BOSCH INDOOR GAS WHOLE HOUSE TANKLESS WATER HEATER 425 HN Item Cat. # Draft Diverter 2 Cover 3 Temperature Adjustment Collar 4 Temperature Adjustment Knob 5 Flame Sensor Cable 6 Electrode Cable 7 Set Of Cables 8 08528 Electronic Control Box 9 08546 Flue Gas Sensor 10 10 1 11 12 13 15 2 26 25 20 16 27 28 21 17 31 32 3 22 5 8 29 39 28 30 18 6 40 41 33 34 35 42 36 43 7 9 08294 Flame Sensor 12 08527 Pilot Electrode 13 08515 Pilot Burner (Natural Gas) 13 08510 Pilot Burner (Liquid Propane) 14 08517 Pilot Orifice (Natural Gas) 14 08518 Pilot Orifice (Liquid Propane) Pilot Tube 16 19 24 4 Heat Exchanger 11 15 14 23 37 44 38 Connecting Pipe (Hot) 17 08334 Overheat Sensor (Eco) 18 08480 Outlet Flex Hose 19 Pilot Tube Washer 20 Washer 21 Washer 22 08418 Water Valve Cover 23 08445 Water Valve Selector Screw 24 Burner Assembly Washer 25 Throttle Disc 26 Main Burner (Natural Gas) 26 Main Burner (Liquid Propane) 27 Pilot Electrovalve 28 O-Ring 29 Burner Electrovalve 30 O-Ring 31 Diaphragm Switch (Natural Gas) 31 Diaphragm Switch (Liquid Propane) 32 08333 Water Valve Set Screw 33 08412 Pushrod 34 08378 Diaphragm 35 Water Inlet Filter 36 08336 Water Connection Gasket 37 08337 Venturi 38 08458 Volumetric Water Governor 39 Gas Valve (Natural Gas) 39 Gas Valve (Liquid Propane) 40 See cat. #19364 for a complete list of parts included in the Complete Parts Kit for Bosch 425 & 635 Series Water Heaters. Description 1 O-Ring 41 08481 Hydro-Generator 42 08938 Water Pipe (Cold) 43 08465 Water Valve 44 08335 Water Elbow Fitting REVISION 01/22/19 5-21