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How Does a Heat Interface Unit Work?

Heat Interface Units (HIU) are typically used during the construction of large apartment complexes and social housing projects. Here rather than each property or dwelling being fitted with an individual boiler, a central boiler is used to provide heat and domestic hot water to all dwellings. Here the HIU acts as a bridge between central boiler and heating systems of the individual apartments or properties.

HIUs work through indirect heating, here the units facilitate a separation between the primary (central) and secondary (individual) systems via a plate heat exchanger which transfers thermal energy from a fluid in the primary system to a fluid in the secondary system.

In terms of how the Heat Interface Units are controlled, there are two possible control types, thermostatic and proportional hydraulic. As the team here at Heatlink UK tailor make our Heat Interface Units to ensure the correct performance for our client’s needs, different control types are used depending on the project’s requirements.

However, the majority of HIUs that are deployed at project sites are thermostatic controlled. Thermostatic controlled units have the benefits of a lower initial cost but do have their drawbacks as many users notice fluctuations in water temperatures, though this can be managed by using a fast-responding thermostat.

Proportional hydraulic controlled systems also negate such issues by providing more consistent hot water temperatures, eliminating the need for thermostatic control. This, however, does incur higher initial costs but provide a better user experience due to the stabilisation of water temperatures.


Want to learn more about HIUs? Why not read our blog on What Exactly is a Heat Interface Unit?

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