Product Overview
The BWT AQA therm SRC (Salt-Reducing-Cartridge) is designed for the treatment of water used in heating systems. It effectively reduces the salt content of the water during filling and refilling processes, which helps to prevent limescale buildup and corrosion within the heating system. This ensures optimal performance and extends the longevity of your heating installation.

Image: The BWT AQA therm SRC Salt-Reducing Cartridge, showing its labels and specifications.
Setup and Installation
Proper installation of the AQA therm SRC cartridge is crucial for its effective operation. This cartridge is designed to be integrated into a compatible BWT AQA therm system.
- Preparation: Ensure the heating system is depressurized and isolated from the main water supply before beginning installation. Refer to your heating system's manual for specific instructions on depressurization.
- Cartridge Alignment: Carefully align the AQA therm SRC cartridge with the designated connection points on your BWT AQA therm system. The cartridge is designed for a specific fit to ensure proper sealing and water flow.
- Secure Connection: Gently push and twist the cartridge until it is securely seated and locked into place. Ensure there is no wobble or looseness.
- System Re-pressurization: Once the cartridge is installed, slowly re-pressurize the heating system according to its manufacturer's guidelines.
- Leak Check: Visually inspect all connection points for any signs of water leakage. If leaks are detected, depressurize the system, re-check the cartridge seating, and repeat the re-pressurization and leak check steps.

Image: The AQA therm SRC cartridge positioned next to the BWT AQA therm system, illustrating the intended connection.

Image: The AQA therm SRC cartridge fully installed and connected to the BWT AQA therm system.
Operation
The BWT AQA therm SRC cartridge operates passively once installed, continuously treating the water as it passes through for filling or refilling the heating system. Its primary function is to reduce the salt content of the water, thereby preventing limescale and corrosion.
To ensure optimal performance, it is important to monitor the associated BWT AQA therm system's display or indicators. These indicators will typically show the remaining capacity of the cartridge or signal when a replacement is due.
Maintenance
Regular maintenance, primarily cartridge replacement, is essential to maintain the effectiveness of your heating system's water treatment.
- Cartridge Replacement: The AQA therm SRC cartridge has a limited capacity. It must be replaced when its capacity is reached, which is indicated by a maximum level of 40° dH (German hardness) or 4000 litres of treated water.
- Replacement Indicator: The BWT AQA therm system display or an integrated flow meter will typically provide an indication when the cartridge capacity is exhausted and replacement is required.
- Disposal: Dispose of the used cartridge responsibly, following local regulations for waste disposal.
Only BWT original cartridges must be used for replacement to ensure compatibility and continued effective water treatment.
Troubleshooting
If you experience issues with your heating system's water quality or the performance of the AQA therm SRC cartridge, consider the following:
- Reduced Water Flow: Check if the cartridge is correctly installed and not obstructed. Ensure the system's valves are fully open.
- System Error Indicators: If your BWT AQA therm system displays an error code or warning, consult the specific manual for that system for detailed troubleshooting steps.
- Water Quality Concerns: If the water quality appears to be untreated (e.g., continued limescale issues), verify that the cartridge capacity has not been exhausted. Replace the cartridge if necessary.
- Leaks: If leaks are observed around the cartridge connection, ensure it is securely fastened. If the leak persists, the O-rings or seals might be damaged, requiring professional inspection.
For persistent issues, it is recommended to contact a qualified technician or BWT customer support.
Specifications
| Feature | Specification |
|---|---|
| Manufacturer | BWT |
| Model Number | 12526 |
| Product Dimensions (L x W x H) | 7.7 x 9.3 x 6 cm |
| Weight | 4.4 kilograms |
| Color | White |
| Quantity of Items | 1 |
| Components Included | No |
| Batteries Required | No |
| Spare Parts Availability | Information unavailable |
| ASIN | B011I66KYY |
Warranty and Support
This product is subject to a 30-day return policy. For specific warranty details beyond the return period, please refer to the terms and conditions provided by the retailer or manufacturer at the time of purchase.
For technical support, product inquiries, or assistance with your BWT AQA therm SRC cartridge, please contact BWT Group directly. You can often find contact information on the official BWT website or through the seller's page where the product was purchased.
Seller: BWT Group







