HIU Servicing London
No hot water? Error codes? Expert HIU servicing, repair, and replacement for district heating systems across London. Same-day response available.
District Heating Specialists
Heat Interface Units require specialist knowledge — most general plumbers can't work on them. Our engineers are trained on all major HIU brands and diagnose issues quickly, minimising downtime so residents get their heating and hot water back fast.
- Annual HIU servicing
- Emergency repairs
- HIU replacements
- Performance optimisation
- All major brands covered
Ready to book?
Free, no-obligation quote. The price we quote is the price you pay.
Our HIU Service Process
Report Issue
Contact us with your HIU problem or service request.
Specialist Visit
A trained HIU engineer diagnoses the issue.
Repair or Replace
We fix the unit or arrange a replacement if needed.
HIU Brands We Service
Danfoss
Full service and repair
Alfa Laval
Specialist expertise
SAV Systems
Certified engineers
Evinox
Approved service provider
Heatrae Sadia
Expert repairs
Other Brands
Contact us to confirm
Common HIU Issues
We regularly diagnose and resolve these problems. If you recognise any, get in touch.
No Hot Water
Often caused by a faulty heat exchanger, low flow rate, or sensor issues.
Low Water Pressure
May indicate a blockage, failed pressure reducing valve, or heat exchanger fault.
Error Codes Displayed
E1, E2, E3 and other codes indicate specific faults. We can diagnose remotely.
Unusual Noises
Banging, whistling or humming often points to air in the system or a failing pump.
Temperature Fluctuations
Inconsistent heating may need sensor recalibration or valve adjustment.
Leaking Unit
Requires immediate attention. Often caused by failed seals or corroded components.
Frequently Asked Questions
A HIU is a compact unit that connects your flat to a district heating network, providing heating and hot water without a traditional boiler.
HIU problems?
Get expert help with your Heat Interface Unit today. All work guaranteed for 12 months.
