Heat network hydronics

Havaro supplies HIUs, retrofit kits and control valves for communal and district heating systems, supporting both new-build and upgrade projects.

Better hydronics.
Better system performance.

Hydronic performance shapes how a heat network behaves in practice, from apartment comfort and HIU control to differential pressure management across the wider system. The Havaro range is designed to support more stable, more controllable and more serviceable networks.

HIU & retrofit kits

Havaro supplies HIUs and retrofit solutions for projects that need a practical route to better unit-level performance. The retrofit kit is designed to upgrade existing mechanical HIUs with a modern electronic control package rather than requiring full HIU replacement.

Designed for fast, practical upgrade work

The retrofit kit brings together the core components needed to modernise existing mechanical HIUs quickly and efficiently.

– Electronic HIU controller

– New control valves

– Heating pump

– Temperature sensors

– Pressure sensors

– Wiring harness

– Pipe kit

The kit is designed for straightforward installation, typically in under an hour, across a wide range of existing applications.

Performance improvements through electronic control

Upgrading a mechanical HIU with the Havaro retrofit kit enables a more responsive and more intelligent operating strategy. This helps support better comfort delivery, improved efficiency and stronger visibility of unit performance.

Benefits

– Weather compensation

– Load compensation

– Improved keep warm performance

– Better remote monitoring and analytics

– Remote control capability

Built around familiar products & system types

The retrofit offer is available for many existing mechanical HIU brands, including SAV. It is supported by technologies and components associated with Siemens, Huba Control, Danfoss, ESBE and QUNDIS.

Differential & independent pressure control

The hydronics range includes differential pressure control valves and pressure independent control valves that help maintain stable operating conditions as loads vary across the network. These products are important for balancing performance, limiting inefficiency and improving controllability over time.

Terminal unit control products

Havaro also supplies pressure independent thermostatic radiator valves, rotary valves and actuators, and thermostatic bypass valves. These products support more accurate local control, improved comfort and better alignment between terminal demand and system operation.

Designed for rising technical expectations

As the UK market moves toward stronger technical standards for heat networks, hydronic performance and controllability matter more than ever. HNTAS is intended to establish minimum performance and reliability standards across both new and existing heat networks, increasing the importance of practical products that support real operational outcomes.