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Unrivalled performance Our pioneering technology and control systems deliver high precision heat management and unrivalled performance in both domestic and district heating environments.

Best for through-life costs Intelligent design leads to greater simplicity – that’s why our systems are cost effective to install, more reliable and cheaper to run and operate.

Better by design Our unique and innovative technology has been refined over many years and is protected by numerous patents relating to water storage, heat exchange and the networking of communal heating systems.

The DIGI HIU uses the latest electronic stepper motor controls to provide both domestic hot water and central heating. Central heating is provided directly, with a Differential Pressure Control Valve fitted across the CH flow and return pipes. The double wall DHW heat exchanger provides complete protection from cross contamination in the case of a plate failure, thereby meeting the most demanding European regulations.


HIU Type Heating and Hot Water
Hot Water Configuration Indirect
Heating Configuration Direct
Heating Temperature Control No
Built-in Heat Meter Yes
Dimensions – HIU Case (mm) 570 (W) x 390 (H) x 170 (D)
Dimensions – inc. Plumbing Jig (mm) 570 (W) x 560 (H) x 207 to 244 (D)
Heating Output (nominal) 26kW
Hot Water Output (nominal) 65kW


The unit comes in an attractive EPP casing, with remarkably low heat losses less than 10W. All connections are bottom entry, with a European standard first fix rail as an optional extra. The first fix rail spaces the unit off the wall to allow insulated pipes to be run up the back, adjusting from 37 to 74mm as standard.


  • Case and heat meter tamperproof security fixings
  • Various heat meter models
  • Landlord security valve or relay kit
  • Heating pump kit
  • Underfloor heating blending valve and pump kit
  • ModBus communication module (externally mounted)
  • CW5 Model – 40kW DHW Output


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