
Heat Interface Units Updates
Published: 01-04-2025
From the 1st April 2025, we will be streamlining our Greenstar Indirect Heat Interface Unit (HIU) range and will be focusing on the Flow 8500 Indirect and Flow 8000 direct HIUs.
Below are the part numbers for the existing Flow 8000 D Direct and Flow 8500 Indirect HIU’s available for your future projects.
Flow 8000 D Direct HIU Direct Range
- Flow 8000 40 D 7-735-600-733
- Flow 8000 40 DH 7-735-600-734
- Flow 8000 50 D 7-735-600-735
- Flow 8000 50 DH 7-735-600-736
- Flow 8000 60 D 7-735-600-737
- Flow 8000 60 DH 7-735-600-738
Flow 8500 Indirect HIU Indirect Range
- Flow 8500 40 7-735-600-739
- Flow 8500 40 H 7-735-600-740
- Flow 8500 50 7-735-600-741
- Flow 8500 50 H 7-735-600-742
- Flow 8500 60 7-735-600-743
- Flow 8500 60 H 7-735-600-744
Please be aware that we are keeping two variants from the Greenstar HIU range available: Greenstar HIU E with HM (7-73-560-724) and Greenstar HIU KE with HM (7-735-600-725), which will be available for purchase until further notice.
Future-proof your project with our heat interface units. We have products to provide heating and hot water from property to plant room. We’ve been providing district heat networks solutions for over a decade and have a dedicated project service to help you from concept to delivery.
More News

Introducing Your Perfect Match – our biggest consumer campaign of the year
We’ve just launched a major national campaign designed to drive one thing: more sales

Heat Interface Units Updates
Keep up to date with our Greenstar HIU range

£500 Clean Heat Cashback
£500 cashback with every qualifying heat pump installation from 1st April 2025 to 31st March 2026