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.

Danfoss Heat Interface Units (HIUs) are known for their reliability and efficiency in district heating systems, but even the best systems need maintenance. At HIU Breakdown and Repairs, we regularly handle common issues with Danfoss HIUs, including problems with the Internal Heat Pressure Transmitter (IHPT) and Automatic Temperature Control Valve (AVTB). In this blog, we explore the top five most common issues that affect Danfoss HIUs, from inconsistent water temperatures to system shutdowns, and explain how our expert team diagnoses and resolves them to keep your heating system running smoothly.