ModuSat® Heat Interface Units: ModuSat® XR-XR-ECO Twin Plate HIUs  


Compact, wall mounted HIUs for indirect high efficiency heating and instantaneous Domestic Hot Water (DHW), to suit a range of typical apartment sizes. Suitable for Radiator and Underfloor Heating systems.

Featuring electronic PID control using PICVs with modulating actuators, for a low primary return temperature, differential pressure control and flow rate regulation.


  • Smart layout for easy installation and maintenance
  • Electronic control
  • Extra compact dimensions (W467 x D315 x H625*)
  • ViewSmart room controller
  • Optional ENE3 Energy Display Device
  • Pipe insulation as standard
  • Fast and responsive DHW performance
  • Smart HIU technology
  • Choice of 5 pipework connection options as standard
  • WRAS Approved Components (Full product WRAS approval pending



  • Independently tested to the UK standard for HIUs from BESA
  • Designed to deliver an excellent VWART
  • ModuSat® XR-ECO models further improve efficiency
  • Low output ModuSat® XR 30 models suit CIBSE ADE CP1.2 DHW guidance
  • Timed Keep-Warm for minimal use of heat network energy
  • High performance at low primary flow as per GLA requirements & SAP
  • DHW return temps under 25℃, as per CIBSE CP1

(*ModuSat XR/XR-ECO 30, 55 & 70)