BOSCH KIT ADDTNL CIRCUIT DIRECT + MIXED

The Bosch Additional Circuit Kit (Direct + Mixed) is a genuine Bosch Thermotechnology accessory for expanding a compatible heating system with one direct heating circuit and one mixed heating circuit. It is designed to support system zoning where a standard radiator loop (direct) operates alongside a circuit requiring a mixing valve, such as underfloor heating (mixed). Ideal for installers looking to add capacity and control to Bosch-based hydronic systems while maintaining OEM performance and reliability.

This kit provides the interface needed to integrate the extra circuits into the control strategy of supported Bosch systems. Use it to create a balanced, efficient setup that separates high-temperature and low-temperature demands. Professional installation is recommended to ensure correct configuration and safe operation.

• Manufacturer: Bosch Thermotechnology Ltd (Worcester)
• Part number: 670468
• Function: Adds one direct circuit and one mixed circuit to a compatible heating system
• Typical use: Radiator circuit (direct) plus underfloor heating circuit (mixed)
• Application: Hydronic system expansion and zoning
• Genuine Bosch OEM accessory
• Professional installation recommended; check boiler/control documentation for compatibility