HIUs

Heat Interface Units

Explore our range of Heat Interface solutions for Heat Networks.

Enhance Performance and Functionality

Accessories

In Context

Communal Heat Networks

A central boiler house will generate heat which is distributed through a network of pipes to each home or apartment in the building.

Each home or apartment has its own HIU (Heat Interface Unit), which converts heat from the network as heating and hot water for the home.

Lowest possible return temperature in the heat network.

These have been measured and calculated in the BESA test regime. This is the VWART (Volume Weighted Average Return Temperature) calculation and is a good guide to the HIU characteristics. VWART calculations are provided for DHW, Space Heating and Standby operational modes. Then an overall average figure is stated for each tested HIU.

Heating takes up most of the operational mode, either by radiators or by underfloor heating, and returns the highest temperatures to the network and plant. It is very important therefore that the circuit is balanced and uses the most effective means of control, and no circuits left ‘open’. Underfloor heating by nature of its lower operating temperatures is particularly suited to HIUs.

Hiper HIU by nature of being electronically controlled has an ‘optimised heating’ feature. Temperature on both flow and return are monitored by the controller, and as the room temperature gets close to the comfort level of the room, the controller then reduces the temperature to the space heating circuit, preventing overshoot of room temperature and maintaining lowest return temperatures to the network and plant.

So the important trade off against the space heating VWART is the DHW and standby modes.

Standby, or ‘keep warm’ is temperature controlled and controls and limits the return temperature to 40°C (a programmable function).

BIM Level 2 Ready and Revit Models are available via BIMstore

Low temperature test results°C
DHW VWART20
Standby VWART39
Space Heating VWART37
Overall result30
High temperature test results°C
DHW VWART13
Standby VWART38
Space Heating VWART40
Overall result30