Heat Interface Unit (HIU) Services
When your heating or hot water stops working, you need more than a quick fix — you need an engineer who understands HIU systems inside and out.
CoreFlow London specialises in the diagnosis, servicing, repair and replacement of Heat Interface Units (HIUs) across London's residential developments. With extensive hands-on experience working on a wide range of HIU manufacturers and district heating systems, we accurately identify faults, resolve issues efficiently and help prevent recurring breakdowns.
Whether you're experiencing no hot water, no heating, pressure loss, temperature fluctuations, leaks, fault codes or poor system performance, our specialist engineers provide professional solutions tailored to your system. We focus on accurate diagnostics, quality workmanship and long-term reliability.
Our goal is simple: restore your heating and hot water quickly, minimise disruption and keep your HIU operating safely and efficiently throughout the year.
Flexible appointment times are available, including early morning, afternoon and out-of-hours bookings where required.
What We Cover
- HIU Breakdown Diagnosis & Repair
- No Heating & No Hot Water Faults
- HIU Fault Finding & System Diagnostics
- Annual HIU Servicing & Preventative Maintenance
- Full HIU Replacement & Installation
- Control Valve, Actuator & Sensor Replacement
- Plate Heat Exchanger Inspection & Replacement
- Expansion Vessel & Pressure Fault Investigation
- Heating & Hot Water Performance Optimisation
- Heat Meter Inspections & Investigations
- Hot Water Storage Cylinder Servicing, Repairs & Replacement
Why Choose CoreFlow London?
- Specialist HIU Engineers
- Accurate Diagnostics & Effective Repairs
- Extensive Experience Across Leading HIU Manufacturers
- Fully Insured (£5 Million Public Liability)
- Transparent Pricing With No Hidden Charges
- Quality Workmanship Guaranteed
- Fully Vetted & Qualified Engineers
- Flexible Appointment Availability
- Trusted by Homeowners, Landlords & Managing Agents
Trusted by Homeowners, Landlords & Managing Agents
CoreFlow London is trusted by homeowners, landlords, estate agents and property managers across London for professional HIU diagnostics, servicing, repairs and replacements.
We understand the importance of maintaining reliable heating and hot water systems and take pride in delivering a dependable, transparent and professional service from start to finish. Detailed job reports, service records and recommendations can be provided following our visits, giving you complete confidence in the condition and performance of your HIU system.
Need Assistance With Your HIU?
Experiencing heating or hot water issues, looking to book an annual service, or considering a HIU replacement? Our specialist engineers are available by appointment and offer flexible booking times to suit your schedule.
0203 051 6485