HIU & Communal Heating
HIU Servicing in London & the M25
HIU servicing keeps the flat within the heat network temperature spec and prevents the slow DHW decline caused by silted strainers. We cover hiu servicing for homeowners, landlords, managing agents and commercial sites across every London borough and the wider M25. Engineer time is £120+VAT per hour with a one hour minimum, and parts are always quoted in writing before they are fitted.
Quick answer
Who provides hiu servicing in London, and what does it cost?
London HVAC Pro provides hiu servicing in London and the M25 using F-Gas certified engineers. Engineer time is £120+VAT per hour with a one hour minimum and no call-out fee, parts are quoted in writing before fitting, and same-day attendance is usually available. Call 07427 826446 to book.
More answers: faults and causes, service costs, areas we cover.
HIU Servicing explained
HIU servicing keeps the flat within the heat network temperature spec and prevents the slow DHW decline caused by silted strainers.
- Strainer clean: Distinguish a pump fault from air, restrictions or closed valves elsewhere in the circuit.
- DHW temperature and flow test: Distinguish a pump fault from air, restrictions or closed valves elsewhere in the circuit.
- Actuator travel test: Check movement, control command and the effect on flow together; the actuator and valve body can fail independently.
- Primary and secondary pressure log: Interpret readings against operating conditions and equipment specification; do not assume a recharge is the answer.
Interpreting the reported fault
A planned visit should establish condition and identify deterioration. An existing fault may need separate diagnosis and parts. Agree which assets, cleaning tasks, functional checks and records are included, and base the interval on manufacturer guidance and operating conditions.
- Reported symptom: an annual service due under the block maintenance schedule
- Record when the problem started and any recent changes
- Keep fault codes and model details for the assessment
Maintenance is not a breakdown repair
A planned visit should establish condition and identify deterioration. An existing fault may need separate diagnosis and parts. Agree which assets, cleaning tasks, functional checks and records are included, and base the interval on manufacturer guidance and operating conditions.
- Confirm equipment model and access before the visit
Labour and the work to be agreed
Engineer time is £120+VAT per hour with a one hour minimum. The time and materials required depend on the diagnosed fault and access. Ask for the repair scope, any additional parts and the return-to-service checks before proceeding.
- £120+VAT per hour, one hour minimum
- Confirm the parts and labour required for the specific fault
HIU Servicing across London
Related hiu & communal heating services
These faults often appear together — each service has its own page with costs and what we check.
Heat Interface Unit Servicing Contract
The usual trigger for a call is a block needing scheduled HIU maintenance across many flats. Other signs worth…
HIU Plate Heat Exchanger Replacement
The usual trigger for a call is hot water that has gradually got weaker and cooler over months. Other signs wo…
HIU Control Valve Replacement
The usual trigger for a call is heating or hot water stuck permanently on or permanently off. Other signs wort…
HIU Actuator Replacement
The usual trigger for a call is an actuator that buzzes, sticks or shows no drive. Other signs worth acting on…
HIU Strainer Cleaning
The usual trigger for a call is reduced flow and poor hot water caused by network debris. Other signs worth ac…
HIU No Hot Water
The usual trigger for a call is no hot water at all from a communal heating flat. Other signs worth acting on …
HIU No Heating
The usual trigger for a call is radiators cold while hot water still works, or both cold. Other signs worth ac…
Communal Heating Repair
The usual trigger for a call is a block with intermittent heating complaints across several flats. Other signs…
See every service on our plumbing and mechanical services index, or read about underfloor heating repair London.
Book hiu servicing in London
Tell us what the system is doing and we will send an engineer with the right parts. £120+VAT per hour, one hour minimum.
Call 07427 826446Frequently Asked Questions
What's included in HIU Servicing
- Condition inspection of each listed asset
- Cleaning tasks agreed for the equipment type
- Functional checks of controls and safety devices
- Readings recorded against the previous visit
- Written findings, with any repairs quoted separately
- Refrigerant handling by F-Gas certified engineers, with records kept
How HIU Servicing works
- 1
Agree the asset list
Tell us which units are included and how they are used.
- 2
Set the interval
Visit frequency is based on manufacturer guidance and operating conditions.
- 3
Planned visit
The engineer inspects, cleans and tests each listed asset.
- 4
Findings
Readings and defects are recorded; repairs are quoted separately.
- 5
Follow-up
Agreed remedial work is booked, and the next visit is scheduled.
HIU Servicing prices
| Item | Price |
|---|---|
| Engineer labour | £120 + VAT per hour |
| Minimum charge | One hour |
| Parts and materials | Written quote before work starts |
| Planned maintenance contract | Quoted per asset list |
See all rates on our prices page or read why customers choose us.
HIU Servicing: scope, checks and next steps
HIU servicing keeps the flat within the heat network temperature spec and prevents the slow DHW decline caused by silted strainers.
What the reported symptom tells us
an annual service due under the block maintenance schedule. Record when this occurs, what changed beforehand and whether other equipment is affected. These observations narrow the investigation; they do not prove which part has failed.
Maintenance is not a breakdown repair
A planned visit should establish condition and identify deterioration. An existing fault may need separate diagnosis and parts. Agree which assets, cleaning tasks, functional checks and records are included, and base the interval on manufacturer guidance and operating conditions.
What each check helps establish
- Strainer clean
- Distinguish a pump fault from air, restrictions or closed valves elsewhere in the circuit.
- DHW temperature and flow test
- Distinguish a pump fault from air, restrictions or closed valves elsewhere in the circuit.
- Actuator travel test
- Check movement, control command and the effect on flow together; the actuator and valve body can fail independently.
- Primary and secondary pressure log
- Interpret readings against operating conditions and equipment specification; do not assume a recharge is the answer.
Related fault and service guidance
Hiu servicing london: common questions
- How much does hiu servicing london cost?
- Hiu servicing london from londonhvacpro is charged from £120+VAT per hour with a one-hour minimum and no call-out fee. Any parts are quoted in writing before work starts.
- How quickly can you attend for hiu servicing london?
- We offer same-day attendance and 24/7 emergency callout across London and the M25. Call 07427 826446 to book an engineer for hiu servicing london.
- Are your engineers certified for hiu servicing london?
- Yes. All refrigeration and air conditioning work is carried out by F-Gas certified engineers in line with the F-Gas Regulations, with every visit documented.