HVAC / Water Heaters
Bosch Aquastar 125B Interior Components and Parts List
Access the official interior components diagram and parts list for the Bosch Aquastar 125B water heater. Identify replacement parts, including burners, valves, and sensors, with reference numbers for accurate maintenance and repair.
Table of contents
Important information about this parts list
This document provides an exploded view diagram and a comprehensive parts list for the Bosch Aquastar 125B water heater. It is intended to assist in identifying internal components for maintenance and repair purposes.
Interior Components Diagram
The diagram illustrates the internal assembly of the water heater, showing the relative positions of components such as the heat exchanger, burners, gas valves, and sensors. Each component is marked with a reference number that corresponds to the parts list.
Parts List and Reference Numbers
The parts list includes the reference number from the diagram, the component name, and the specific Bosch part number. Note that some components have different versions based on the gas type (NG for Natural Gas or LP for Liquid Propane).
Compatibility and Usage Notes
Please be aware of the following when using this parts list:
- Manufacturing Date: The parts listed are primarily for models built after February 2003. While some parts may work for older models, verification is necessary.
- Part Number Changes: Bosch has updated part numbers over time. Always verify the part number before ordering.
- Gas Type: Ensure you select the correct part for your specific gas type (NG or LP) where applicable, such as for the main burner, pilot injector, and gas valve.
Manufacturer information
Bosch
Practical help
Common problems
Incorrect part ordered due to version changes
Bosch has changed part numbers over the years. Always verify the part number against the specific unit's manufacturing date and current catalog.
Selecting wrong gas type component
Check if your unit uses Natural Gas (NG) or Liquid Propane (LP) and select the corresponding part number from the list.
Before use
- Verify the manufacturing date of your Bosch Aquastar 125B unit.
- Determine if your unit is configured for Natural Gas (NG) or Liquid Propane (LP).
- Locate the faulty component on the exploded diagram to identify its reference number.
- Cross-reference the part number with the official Bosch parts catalog.
Images and diagrams
- The diagram shows an exploded view of the internal components.
- Numbers on the diagram correspond directly to the items in the parts list.
Model compatibility
- Parts are designed for models built after February 2003.
- Some parts may be compatible with older 125B models, but this is not guaranteed.
Manual page author
Michael Turner
Technical manual editor
Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.