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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 MIX is based on the DATA SPLIT twin plate HIU however the central heating plate heat exchanger has been replaced with a manifold to allow direct connection to the heating circuit.  This manifold enables the central heating temperature to be controlled, unlike most direct central heating HIU’s on the market.

A direct central heating HIU does not require the expansion vessel and safety relief valve normally fitted to the central heating circuit, plus there is no temperature loss across the plate heat exchanger, making direct heating HIU’s better value and more efficient than a standard twin plate HIU.


HIU Type Heating and Hot Water
Hot Water Configuration Indirect
Heating Configuration Direct
Heating Temperature Control Yes
Built-in Heat Meter Yes
Dimensions – HIU Case (mm) 560 (W) x 470 (H) x 255 (D)
Dimensions – inc. Plumbing Jig (mm) 560 (W) x 580 (H) x 305 to 330 (D)
Heating Output (nominal) 30kW
Hot Water Output (nominal) 80kW
Sealed System Kit Position N/A


The MIX comes in an attractive EPP casing with remarkably low heat losses less than 50W. All pipework connections are bottom entry and the unit is supplied with a pre-plumbing rail as standard. A number of optional extras are available, as shown below.



  • Case and heat meter tamperproof security fixings
  • Various heat meter models
  • Landlord security valve or relay kit
  • Top pipework adaptor kit
  • Differential pressure control valve for >2.5 bar ΔP
  • ModBus communication module


DATA SPLIT Datasheet   DATA SPLIT Installation Instructions


Technical Detail

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