HIU Servicing in London

Keeping Your Heating & Hot Water Running Exactly As It Should

Your HIU is the heart of your heating and hot water system — and like anything working hard every day, it needs regular servicing to perform properly.

Without maintenance, HIUs gradually lose efficiency. Filters block, flow rates drop, temperatures fluctuate, and before long you’re dealing with poor hot water, uneven heating, higher energy bills… or a breakdown you didn’t need.

At HBR Heating Services, we provide professional HIU servicing across London, designed to keep your system running efficiently, reliably and cost-effectively.

We don’t just “tick a box” — we properly assess performance, identify early-stage faults, and help extend the life of your unit while reducing future repair costs.

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What’s Included in a HIU Service

Our servicing is structured, thorough and focused on real system performance — not just a quick check.

Cleaning internal strainers and filters

Full visual and mechanical inspection of components

Hot water and heating temperature checks

Expansion vessel pressure testing and adjustment

Heating system balancing (radiators or underfloor heating where required)

Inhibitor testing and dosing (F1 / X100 if needed)

Heat meter performance checks

Flow rate and circulation analysis

Primary flow and return temperature assessment

Energy usage and efficiency review (kWh analysis)

Inspection for current or historical leaks

Detailed HIU service report and certification

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Block & Multi-Property HIU Servicing

Managing multiple HIUs within a building or development?

We offer discounted group bookings across London, ideal for:

• Landlords

• Managing agents

• Apartment blocks & developments

Minimum: 5 units per booking

Each HIU is serviced individually, with its own report and certification, while scheduling is tailored around the building to minimise disruption.

Our engineers are experienced with all major HIU manufacturers, including Caleffi, Evinox, Intatec and more.

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HIU Service Options

HBR 1 – Essential Service £ 85.00

A solid annual service to keep your HIU operating safely and efficiently.

• Full visual inspection for wear, leaks or faults

• Cleaning of primary filter

• Hot water and heating temperature checks

• System repressurisation (if required)

• Basic fault checks with clear recommendations

• Venting of radiators or UFH circuits

• Recording unit details (make, model, serial)

• Detailed service report

Repairs and parts not included

HBR 2 – Advanced Service £ 105.00

Everything in HBR 1, plus deeper performance checks and system protection.

• Cleaning of secondary filter

• Heat meter functionality check

• Expansion vessel testing and recharge

• Inhibitor level testing

• Internal valve inspection

• Minor accessible leak repairs

• Heating and hot water adjustments

• Pump optimisation (where applicable)

Repairs and parts not included

HBR 3 – Full  Service £ 155.00

A complete system optimisation service — ideal for older HIUs or ongoing issues.

Includes HBR 1 & 2, plus:

• Manufacturer-specific servicing

• Inhibitor top-up for long-term protection

• Plate heat exchanger inspection and cleaning (if required)

• Replacement of small worn components ( i.e. washers)

• Full heating and hot water performance review

• Flow rate testing and efficiency checks

• Full system and zone verification

Repairs and parts not included

Why Regular HIU Servicing Matters

A properly serviced HIU will:

• Deliver consistent hot water

• Maintain stable heating performance

• Run more efficiently (lower energy bills)

• Reduce the risk of breakdowns

• Extend the lifespan of the unit

A neglected HIU does the opposite — and usually costs more in the long run.

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Book Your HIU Service

Whether you’re booking for a single property or an entire building, we make the process simple.

Call now to book

Or message us on WhatsApp for a fast response

HBR Heating Services — HIU specialists keeping London’s heating and hot water running properly.