BOSCH OUTDOOR GAS WHOLE HOUSE TANKLESS WATER HEATER 425 HNO Item 1 2 3 4 4 5 5 6 7 8 9 9 3 4 5 6 8 22 32 20 21 9 19 18 1 10 17 16 11 13 14 15 39 40 41 42 38 36 37 34 33 31 35 7 23 24 26 29 27 28 31 30 25 12 2 43 See cat. #19364 for a complete list of parts included in the Complete Parts Kit for Bosch 425 & 635 Series Water Heaters. 5-22 10 11 12 13 14 15 16 17 18 19 19 20 21 22 22 23 24 25 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 REVISION 01/22/19 Cat. # Description Cover Screw 08294 Flame Sensor 08515 Pilot Burner (Natural Gas) 08510 Pilot Burner (Liquid Propane) 08517 Pilot Orfice (Natural Gas) 08518 Pilot Orfice (Liquid Propane) Pilot Gas Pipe 08527 Pilot Electrode Washer Gas Regulator (Liquid Propame) Gas Regulator (Natural Gas) 08418 Water Valve Cover 08445 Selector Screw Volumetric Water Governor 08337 Venturi Inlet Water Filter Wire Form Spring 08378 Diaphragm 08412 Pushrod Screw Diaphragm Switch (Natural Gas) Diaphragm Switch (Liquid Propane) Servovalve Pilot Valve Gas Valve (Natural Gas) Gas Valve (Liquid Propane) Throttle Disc Washer Burner (Natural Gas) Burner (Liquid Propane) Hot Water Pipe Temperature Limit Wire Form Spring Heating Body 08481 Hydrogenerator O-Ring Wire Form Spring Wire Form Spring O-Ring 08938 Cold Water Pipe Switch Set Of Cables Connecting Cables Ignition Unit Cold Water Pipe Water Valve Anti-Frost Device Thermostat