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Bosch Aquastar Repair Parts Page Radiant Heat PEX Tubing Gas Space Heaters Electric Heaters Boilers Radiators Solar Heating Supplies HVAC Fan Convectors Plumbing Supplies Water Heaters Vent Pipe Gas Fireplace Wood Stoves Misc House Fans Bath & Kitchen Save Energy Clearance Items Wrap yourself in warmth! A1155 Bosch Aquastar 125X Water Heater Repair Parts Buy Page Disclaimer Searching for a Part number? click here Looking for a Part that is not listed? click here *The prices on this page are for Web Orders Only! Contractors & Plumbers - click here for savings Water Heater repair parts ship via UPS or USPS. Most small, light weight parts on this page ship via USPS. Please be sure to provide us with a valid postal address if it's different than the UPS address. Most shipments are received within 2 to 10 business days. Faster shipping is available. Warning!  All parts are non-returnable. Technical Support     Parts Diagram     Service Bulletins     Faster Shipping Model Model Your Cost Change quantity in your Shopping Cart. You can always remove items later. Part # 8705406380   Bosch Aquastar 125X Heat Exchanger LOC 3305 - (Formerly - 8705406235) Part 8705406380 - Non-returnable Download Service Bulletin Disclaimer $287.00  Part # 8707002810   Bosch Aquastar 125X Water Valve Assembly (conversion kit) LOC 3375 - Part 8707002810 - Non-returnable Download Service Bulletin Disclaimer $193.00  Part # 8703406244   Bosch Aquastar 125X Water Valve Pushrod LOC 3230 - Part 8703406244 - Non-returnable Download Service Bulletin Disclaimer $10.00  Part # 8707402015   Bosch Aquastar 125X Volumetric Water Governor LOC 3460 - Part 8707402015 - Non-returnable Download Service Bulletin Disclaimer $24.00  Part # 8703401165   Bosch Aquastar 125X Water valve set screw LOC 3220 - Part 8703401165 - Non-returnable Download Service Bulletin Disclaimer $6.25  Part # 8710103043   Bosch Aquastar 125X Water Connections Gasket LOC 3565 - Part 8710103043 - Non-returnable Download Service Bulletin Disclaimer $5.25  Part # 870050305   Bosch Aquastar 125X Water Valve Diaphragm LOC 3080 - Part 8700503053 - Non-returnable Download Service Bulletin Disclaimer $23.00  Part # 8700507059   Bosch Aquastar 125X Inlet Filter LOC 3110 - Part 8700507059 - Non-returnable Download Service Bulletin Disclaimer $10.25  Part # 8708205249   Bosch Aquastar 125X Water Valve Venturi LOC 3530 - Part 8708205249 - Non-returnable Download Service Bulletin Disclaimer $10.25  Part # 8700703114   125X Water Elbow Fitting LOC 3120 - Part 8700703114 non-returnable Download Service Bulletin Disclaimer $68.80  Part # 8700705294   Bosch Aquastar 125X Cold Water Pipe LOC 3130 - Part 8700705294 - Non-returnable Download Service Bulletin Disclaimer $19.00  Part # 8700705556   Bosch Aquastar 125X Hot Water Pipe LOC 3140 - Part 8700705556 - Non-returnable Download Service Bulletin Disclaimer $36.00  Part # 8702000111   Bosch Aquastar 125X Temp Adjustment knob LOC 3205 - Part 8702000111 - Non-returnable Download Service Bulletin Disclaimer $9.25  Part # 8702000219   Bosch Aquastar 125X Temp Adjustment Collar and Knob LOC 3075 - Part 8702000219 - Non-returnable Download Service Bulletin Disclaimer $12.00  Part # 8718105051   Bosch Aquastar 125X Pilot Assembly NG LOC 3585 - Part 8718105051 - Non-returnable Download Service Bulletin Disclaimer $16.00  Part # 8708105491   Bosch Aquastar 125X Pilot Assembly LP LOC 3475 - Part 8708105491 - Non-returnable Download Service Bulletin Disclaimer $24.70  Part # 870820006   Bosch Aquastar 125X Pilot Injector Natural Gas LOC 3510 - Part 8708200069 - Non-returnable Download Service Bulletin Disclaimer $6.25  Part # 8708200312   Bosch Aquastar 125X Pilot Injector Propane Gas LOC 3515 - Part 8708200312 - Non-returnable Download Service Bulletin Disclaimer $6.45  Part # 8700707349   Bosch Aquastar 125X Pilot Tube LOC 3165 - Part 8700707349 - Non-returnable Download Service Bulletin Disclaimer $12.95  Part # 8700103173   Bosch Aquastar 125X Pilot Tube Gasket LOC 3015 - Part 8700103173 - Non-returnable Download Service Bulletin Disclaimer $5.35  Part # 8700205120   Bosch Aquastar 125X Electrovalve O-Ring LOC 3040 - Part 8700205120 - Non-returnable Download Service Bulletin Disclaimer $5.35  Part # 8708501249   Bosch Aquastar 125X Pilot Electrovalve LOC 3540 - Part 8708501249 - Non-returnable Download Service Bulletin Disclaimer $49.50  Part # 8708501250   Bosch Aquastar 125X Burner Electrovalve LOC 3545 - Part 8708501250 - Non-returnable Download Service Bulletin Disclaimer $54.80  Part # 8708107006   Bosch Aquastar 125X Piezo Electrode LOC 3485 - Part 8708107006 - Non-returnable Download Service Bulletin Disclaimer $10.25  Part # 8708107007   Bosch Aquastar 125X Flame Sensor Rod LOC 3490 - Part 8708107007 - Non-returnable Download Service Bulletin Disclaimer $10.25  Part # 8707207011   Bosch Aquastar 125X Electronic Ignition Box LOC 3435 - Part 8707207011 - Non-returnable Download Service Bulletin Disclaimer $93.00  Part # 8707206040   Bosch Aquastar 125X Overheat Sensor (ECO) LOC 3405 - Part 8707206040 - Non-returnable Download Service Bulletin Disclaimer $38.00  Part # 8707200014   Bosch Aquastar 125X On/Off Switch LOC 3390 - Part 8707200014 - Non-returnable Download Service Bulletin Disclaimer $12.25  Part # 8707305001   Bosch Aquastar 125X LED Control LOC 3450 - Part 8707305001 - Non-returnable Download Service Bulletin Disclaimer $45.00  Part # 8700505062   Bosch Aquastar 125X Battery Box LOC 3090 - Part 8700505062 - Non-returnable Download Service Bulletin Disclaimer $11.00  Part # 8707200007   Bosch Aquastar 125X Microswitch LOC 3385 - Part 8707200007 - Non-returnable Download Service Bulletin Disclaimer $25.00  Part # 8342400000   Bosch Aquastar 125X Regulator Natural Gas LOC 3000 - Part 8342400000 - Non-returnable Disclaimer $48.00  Part # 8345520000   Bosch Aquastar 125X Regulator Propane Gas LOC 3005 - Part 8345520000 - Non-returnable Disclaimer $45.00  Part # 8704401035   Bosch Aquastar 125X Set of Cables complete LOC 3236 - Part 8704401035 - Non-returnable Download Service Bulletin Disclaimer $53.00  Part # 8705421255 No Image Available Bosch Aquastar 125X Front Cover LOC 3321 - Drop ship from mfg - Part 8705421255 - Non-returnable This item ships directly from Bosch and may take up to 2 extra days to process. Download Service Bulletin Disclaimer $165.00  Part # 8707011729   Bosch Aquastar 125X Gas valve NG LOC 3660 - Drop ship from mfg - Part 8707011729 - Non-returnable This item ships directly from Bosch and may take up to 2 extra days to process. Download Service Bulletin Disclaimer $240.00  Part # 8707011730   Bosch Aquastar 125X Gas valve LP LOC 3665 - Drop ship from mfg - Part 8707011730 - Non-returnable This item ships directly from Bosch and may take up to 2 extra days to process. Download Service Bulletin Disclaimer $240.00  Part # 8708120296   Bosch Aquastar 125X Main Burner LP w/ Washer LOC 3497 - Drop ship from mfg - Part 8708120296 - Non-returnable This item ships directly from Bosch and may take up to 2 extra days to process. Download Service Bulletin Disclaimer $136.50  Part # 8708120298   Bosch Aquastar 125X Main Burner NG w/ Washer LOC 3498 - Drop ship from mfg - Part 8708120298 - Non-returnable This item ships directly from Bosch and may take up to 2 extra days to process. Download Service Bulletin Disclaimer $110.70  Part # 8708500251   Bosch Aquastar 125X Water Valve selector screw LOC 3536 - Part 8708500251 - Non-returnable Download Service Bulletin Disclaimer $22.00  Part # 8708503063   Bosch Aquastar Water Valve Slow Ignition Valve Loc 3555 - Part 8708503063 - Non-returnable Download Service Bulletin Disclaimer $11.25  Part # 8708504021   Bosch Aquastar 125X Diaphragm Switch NG LOC 3556 - Part 8708504021 - Non-returnable Download Service Bulletin Disclaimer $119.00  Part # 8708504049   Bosch Aquastar 125X Diaphragm Switch LP LOC 3557 - Drop ship from mfg - Part 8708504049 - Non-returnable This item ships directly from Bosch and may take up to 2 extra days to process. Download Service Bulletin Disclaimer $119.00  Part # 8710103045   Bosch Aquastar 125X Washer 1/2 Inch LOC 3570 - Part 8710103045 - Non-returnable Download Service Bulletin Disclaimer $5.25  Part # 8710103060   Bosch Aquastar 125X Burner Assembly Washer LOC 3571 - Part 8710103060 - Non-returnable Download Service Bulletin Disclaimer $5.25  Part # WVKIT125X   Bosch Water Valve rebuild kit 125X with Brass Water Valve LOC 3220/3230/3555/3460/3565/3570/3615 - Part #WVKIT 125XBWV (8703406244 and 8708503063 and 8707402015 and DOWLUBE and 2 X 8710103043 and 2 X 8710103045 and 2 X 8703401051 - Non-returnable Download Service Bulletin Disclaimer $51.95  Dow Lube No Image Available Package of Dow Lube--Loc 3615 - Non-returnable Disclaimer $2.95  Technical Support     Parts Diagram     Service Bulletins     Faster Shipping Disclaimer Searching for a Part number? click here Looking for a Part that is not listed? click here *The prices on this page are for Web Orders Only! Contractors & Plumbers - click here for savings Water Heater repair parts ship via UPS or USPS. Most small, light weight parts on this page ship via USPS. Please be sure to provide us with a valid postal address if it's different than the UPS address. Most shipments are received within 2 to 10 business days. Faster shipping is available. Warning!  All parts are non-returnable. 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