HIU’s Serviced & Repaired
HBR Heating Services – Comprehensive HIU Servicing & Repairs
At HBR Heating Services, we specialise in the expert servicing, commissioning, and repair of Heat Interface Units (HIUs). Our engineers combine hands-on expertise with advanced diagnostic tools to ensure your HIU runs efficiently, reliably, and safely.
Our annual HIU service is designed to maximise performance, prevent breakdowns, and extend system life. Every service includes:
– Cleaning and clearing HIU strainers and filters
– A full visual and physical inspection of all HIU components
– Temperature checks for hot water and central heating
– Re-pressurising expansion vessels (if required)
– Central heating system balancing (where necessary)
– Application of chemical inhibitors (F1 or X100 if needed)
– Underfloor heating balancing (if applicable)
– Heat meter inspection and analysis
– Flow rate checks (m³/h or l/h)
– Primary flow and return temperature analysis
– Energy usage and kWh consumption review
– Historical leak inspections and trace checks
We use specialist commissioning software and plug-in diagnostics to keep HIUs operating at their best. Our tools allow us to connect to and commission intelligent HIUs from leading manufacturers, run in-depth diagnostics to identify and resolve faults quickly, and optimise system performance during both servicing and breakdown repairs.
Our commissioning procedure includes:
• Full leak and water damage inspection
• Secondary flow and return analysis
• Checking and closing manual bypass valves
• Cleaning and inspecting primary and secondary strainers
• Checking secure connections and joints
• Firmware/software verification and updates (where needed)
• Primary flow, return, and Delta T analysis
• Verification of heating and DHW performance against manufacturer requirements
• Heat meter, kPa, and flow rate analysis
HIU Repair Visits – What’s Covered
If your HIU fails, our engineers are ready to get you back up and running quickly.
Typical repairs include:
• Leak repairs on HIU pipework and components
• Freeing seized circulation pumps
• Releasing stuck temperature control valves
• Clearing blocked or clogged strainer filters
• Repairing differential pressure controller (DPCV) failures
• Re-pressurising expansion vessels
• Repairing or replacing faulty motorised flow control valves
• Reconnecting thermostat and HIU communication links
• Underfloor heating investigations
• Radiator balancing and optimisation
Hot Water & Heating Fault Investigation
Whether your HIU supplies radiators or underfloor heating, we carefully investigate and resolve heating and hot water issues.
Our fault investigations cover:
• Testing all taps and outlets for intermittent or no hot water
• Inspecting DHW and heating valve settings
• Checking primary inlet working temperature
• Verifying DHW temperature production (42–60°C range)
• Analysing maximum DHW instantaneous output
• Checking sensors, exchangers, and valve control
Common causes of failure we resolve include:
• Centralised plant system outages
• Clogged filters on supply/return lines
• Blocked or scaled heat exchangers
• Seized circulation pumps
• Defective or leaking modulating valves
• Faulty temperature or flow sensors
Brands We Work On
Our engineers are fully trained and experienced in working with all major HIU brands, including:
• Caleffi
• Evinox
• Switch2
• Inta / Intatec
• Danfoss
• Vital Energi
• Comap
• SAV Systems
• Sycous
• Remeha
• ModuSat
• Heatlink
• Other intelligent and communal HIU systems
If your HIU brand isn’t listed, don’t worry – we can still help. Our advanced diagnostic tools and years of experience mean we can repair, commission, and service almost any model currently in use across London.
Why Choose HBR Heating Services?
• Specialists in all leading HIU brands
• Advanced commissioning and diagnostic technology
• Transparent call-out charges with no hidden extras
• Energy efficiency focus – reducing running costs and extending HIU lifespan
• Trusted across London and surrounding areas
At HBR Heating Services, we make sure your HIU is safe, efficient, and fully optimised, giving you peace of mind and reliable heating and hot water all year round.
Call 0208 1111 427
