Choosing the right Heat Interface Unit (HIU) engineer can save you time, money, and stress. HIUs are complex systems that require specialist knowledge — not just general plumbing skills. In this guide, we explain how to select the best HIU engineer in London, what qualifications to look for, and why reputation, experience, and transparent pricing matter.

Ever wondered how that toasty radiator heat arrives in your apartment or building, especially if you don't have a traditional boiler on-site? The answer lies in a clever piece of technology called a Heat Interface Unit (HIU).