HIU Servicing
How Much Does HIU Servicing Cost?
The cost of servicing a Heat Interface Unit (HIU) typically starts at £200 (ex VAT), depending on the type of unit, access requirements, and the building’s heating system layout. Complex communal systems or those in high-rise developments may incur additional labour time. Any necessary replacement parts or repairs are charged separately.
What Is a Heat Interface Unit (HIU)?
A Heat Interface Unit (HIU) acts as the bridge between a building’s centralised heat source and the individual dwelling or commercial space. Commonly used in district and communal heating schemes, HIUs provide space heating and hot water on demand, without the need for individual gas boilers.
Each HIU typically includes:
A plate heat exchanger
Pump and control valves
Heat meters (in metered systems)
Temperature and pressure sensors
Programmable controllers
Found in apartment blocks, student accommodations, and mixed-use developments, HIUs ensure occupants benefit from efficient heating and hot water, with billing based on actual usage.
How Often Should a HIU Be Serviced?
It is recommended that HIUs be serviced annually, particularly in residential or high-use settings. Routine servicing is essential in multi-resident buildings to keep the entire heating network operating efficiently and to avoid disruption.
Regular servicing:
Maintains consistent heating and hot water delivery
Reduces system strain and wear
Prevents blockages, limescale buildup, or valve failures
Ensures compliance with manufacturer warranties and building management standards
What’s Included in an HIU Service?
A professional HIU service ensures optimal performance and identifies issues before they escalate. A standard service usually includes:
Inspection and cleaning of filters and strainers
Descaling of domestic hot water (DHW) plate heat exchangers
Checking flow rates, temperatures, and pressure levels
Control valve and actuator testing
Sensor calibration and thermostat checks
Inspection for leaks and insulation defects
Fault code diagnostics and performance testing
A detailed service report is provided after the visit, useful for landlord compliance, warranty claims, and maintenance tracking.
Signs Your HIU Needs a Service
Don’t wait until your next scheduled service if you notice any of the following:
Hot water not reaching set temperatures
Radiators not heating properly
Unusual noises from the HIU
Leaks or visible corrosion
Fluctuating water pressure
Inconsistent hot water availability
These issues may indicate limescale buildup, faulty valves, or circulation problems — all of which are preventable with routine servicing.
Benefits of Regular HIU Servicing
Investing in regular HIU maintenance benefits both building managers and residents by:
Improving energy efficiency and reducing heat losses
Preventing unplanned outages and emergency callouts
Extending the lifespan of HIUs and connected systems
Supporting accurate metering and billing
Ensuring consistent tenant satisfaction and comfort
Whether managing a single block or an entire estate, proactive HIU maintenance reduces operational costs and improves heating system reliability across the board.
Summary
HIUs are a crucial component in modern communal and district heating systems, delivering hot water and heating where it’s needed. But like any mechanical system, they require professional servicing to keep performing at their best.
To recap, HIU servicing helps to:
Optimise system performance
Minimise energy waste and breakdowns
Extend equipment life
Ensure comfort, compliance, and safety
Book Your HIU Service Today
At MHL, our experienced engineers provide expert HIU servicing for residential developments, commercial properties, and housing associations across the UK. Whether you’re managing one unit or hundreds, we’ll ensure your heating network runs efficiently and reliably.
Contact us today to schedule a service at your home or rental property or request a tailored quote for your property portfolio. We operate throughout the UK.
