HIU (Heat Interface Unit) Service, Repair & Maintenance
Get Heated provides specialist HIU servicing, repair, and maintenance across Luton, Watford, Harrow, and the wider region. Whether you manage a residential block of flats on a district or communal heating system, or you're a resident experiencing problems with your heating or hot water, our engineers have the expertise to diagnose and resolve HIU faults quickly and efficiently.
We service and repair all HIU brands including Danfoss, Altecnic, and all other manufacturers. Our engineers carry common spare parts and have extensive experience working with the full range of heat interface units found in modern apartment buildings, new-build developments, and commercial properties across Bedfordshire, Hertfordshire, and Greater London.
HIU breakdowns can leave you without heating and hot water — which is why we offer 24-hour emergency callouts for HIU faults. Whether it's an HIU breakdown in Harrow, a Danfoss HIU repair in Luton, or routine HIU maintenance in Watford, our team responds fast and resolves the issue on the first visit wherever possible.
Brands We Work With
What Is an HIU (Heat Interface Unit)?
If you live in a flat or apartment that's connected to a communal or district heating system, you almost certainly have a Heat Interface Unit — or HIU — in your property. It's usually a compact box mounted on the wall, often in a utility cupboard or kitchen, and it's the device that transfers heat from the building's shared heating network into your flat's own central heating and hot water.
Think of it as your flat's equivalent of a boiler — but instead of burning gas, it uses hot water from the building's central plant room to heat your radiators and provide hot water to your taps and showers. Common brands include Danfoss and Altecnic, though there are many other manufacturers.
Why Does It Need Servicing?
Like any heating equipment, HIUs need regular servicing to work efficiently. Over time, the internal heat exchanger can build up scale and debris, valves can stick, and sensors can fail — leading to poor heating performance, inconsistent hot water temperatures, or a complete loss of heating and hot water.
Many residents don't realise they're responsible for maintaining the HIU in their flat — it's often not covered by the building's communal maintenance contract. Annual servicing keeps your unit running efficiently, reduces your energy bills, and prevents unexpected breakdowns during cold weather.
HIU Broken Down? We're Available 24/7
Our engineers respond to emergency HIU callouts across Luton, Watford, Harrow, and the surrounding region — day or night.
Call 24hr Emergency LineWhat's Included
- Annual HIU servicing and maintenance
- HIU fault finding and diagnostics
- Emergency HIU repair — 24-hour callouts
- Danfoss, Altecnic and all other makes serviced
- Plate heat exchanger cleaning and descaling
- Valve, actuator, and sensor replacement
- Pressure and flow rate testing
- Residential flats and commercial buildings covered
- Building management and landlord contracts available
- Full service report and documentation