Caledonia Heat Interface Unit (HIU)

The HIU is a complete package comprising of all components mounted on a frame, factory assembled and tested.

All Herz HIUs incorporate a first Fix rail with isolation ball valves to allow shell and core pipework to be completed without the HIU being fitted, this also aids maintenance once the unit is installed. First fix rail ball valves are fitted with drain valves to facilitate draining with integral test points fitted on the primary and secondary heating circuits on most units.