HIU Servicing London
Annual Service & Certificate
Comprehensive 12-point annual HIU servicing for flats, landlords, managing agents and housing associations across London. Keep your heat interface unit efficient, compliant and under warranty.
Every service includes strainer cleaning, plate heat exchanger inspection, valve testing, controller diagnostics and a full digital compliance certificate.
Typical HIU units we service across London
Service Checklist
Comprehensive inspection
Per Unit
Volume pricing available
HIU Brands
All manufacturers
Certificate
After every service
Why It Matters
Why Service Your HIU Every Year?
Annual HIU servicing is not optional — it protects your warranty, keeps you compliant, prevents costly breakdowns, and ensures your unit runs at peak efficiency.
Warranty Protection
Most HIU manufacturers require annual servicing to keep the warranty valid. Miss a service and your warranty could be void.
Legal Compliance
Landlords must maintain heating and hot water under HHSRS. Annual servicing is your proof of compliance and duty of care.
Prevent Breakdowns
A scaled strainer or failing valve caught during a service costs a fraction of an emergency breakdown repair.
Maintain Efficiency
A properly serviced HIU delivers hot water faster, uses less energy from the heat network, and costs less to run.
What We Do
Our 12-Point HIU Service Checklist
Every HIU service follows the same structured checklist. Nothing is skipped or rushed.
Plate Heat Exchanger Inspection
Check primary and secondary plate heat exchanger for scale, fouling and flow restriction. Clean or descale where required.
DHW Control Valve & Actuator
Test the domestic hot water control valve and actuator for correct opening, closing and response to demand.
Heating Circuit Valve
Verify the heating circuit control valve operation, checking for passing/leak-by and correct modulation.
Strainer & Filter Cleaning
Remove and clean primary and secondary strainers. Check for debris, scale and blockage that restrict flow.
Temperature Sensor Calibration
Verify DHW and heating flow/return temperature sensor accuracy. Replace sensors reading out of tolerance.
Circulating Pump Test
Check secondary circulating pump operation, speed settings, noise levels and electrical consumption.
Pressure & Expansion Vessel
Check primary and secondary system pressure, expansion vessel pre-charge and PRV (pressure relief valve) operation.
Controller Diagnostics
Read fault log, check controller settings, verify commissioning parameters and reset any historical error codes.
Flow Rate & Temperature Delta
Measure DHW flow rate, primary flow/return temperatures and delta-T to confirm the HIU is performing to specification.
Leak Inspection
Full visual inspection of all internal connections, valves and pipework for weeps, leaks and corrosion.
Heat Meter Check
Verify heat meter operation, check meter readings against consumption and ensure accurate billing data.
Service Certificate
Issue a full HIU service record and compliance certificate documenting every check, reading and recommendation.
Transparent Pricing
HIU Servicing Plans
Fixed prices. No callout charges. No hidden fees. Volume discounts for landlords and managing agents.
Single HIU Service
One-off annual service for a single flat
- Full 12-point HIU service
- Strainer and filter cleaning
- Plate heat exchanger inspection
- Controller diagnostics & fault log read
- Digital service certificate
- 12-month parts & labour guarantee
For Property Managers
Block-Wide HIU Servicing Contracts
We manage planned HIU servicing programmes for property management companies, block managers and housing associations across London. One contractor, one schedule, one compliance pack.
- Scheduled servicing for entire blocks or portfolios
- Dedicated account manager who knows your buildings
- All compliance documentation in a single pack
- Volume pricing for 5+ units
- Reactive repair SLAs available (2hr / 4hr / 8hr)
- Tenant liaison and access coordination
FAQs
HIU Servicing FAQs
Book Your HIU Service Today
Annual servicing from £95 per unit. Compliance certificate included.