Integrated Water Circuits (IWCs)

Integrated Water Circulator IWC HVAC OEM Grundfos

The Grundfos CHB IWC consists of a return group and flow group pre mounted in-line on a bottom plate. This combination makes up 90% of the hydraulic system in your boiler.



  • High degree of predesign – Functionalities built into the housing
  • High modularity – Flexible concept with several standard components
  • Significant cost reductions – Prefabricated modularity cuts project and tooling costs
  • Simplify your supply chain - One unique supplier for most hydraulic components
  • Compact design – Less space required in the complete heating system
  • Outstanding reliability and robustness – Quality tested to perfection
  • High serviceability – Easy access to different components
  • Global support - Grundfos supports the CHB IWC platform all around the world


Pump heads CHB IWC Grundfos HVAC OEM

The CHB IWC portfolio consists of three IWCs for different applications: COMBI, TANK, and SYSTEM

Contact your Grundfos HVAC OEM sales representative if you want to learn more about Integrated Water Circuits.