The Heat Interface Unit (HIU) is a complete package comprising all components mounted on a frame, factory assembled and tested.
Versatile Heating, Cooling & Ventilation have partnered exclusively with Herz to bring quality, European HIUs to the Irish market, which 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.
We also offer a direct HIU, the York, with a single heat exchanger for residential hot water and the space heating supplied direct through the unit from the primary supply.
All three of these HIUs (2 direct & 1 indirect) incorporate a Pressure temperature control valve which allows the DHW heat exchanger to operate on demand only and gives the DHW 100% priority over the space heating.
When the hot water demand ceases, the pressure temperature control valve will immediately stop the primary flow into the heat exchanger. Therefore there is no drain on the primary heating when there is no demand, so no “extra energy usage” when residents are away on holiday, for example.
The Oxford HIU with a single heat exchanger supplying DHW, also incorporates the pressure temperature control valve to control the DHW supply and temperature. Oxford HIU has dual orientation and has been designed with the ball valve connections at the top or at the bottom depending on the requirement.
The Ecosse is a HIU with a single heat exchanger supplying heating. This model has been specifically deigned for projects with existing water cylinders or alternative hot water storage or supply methods. The Ecosse HIU can be easily configured into an “S” Plan system.