Plantrooms
Packages available
PLANTROOMS
Many packages available to suit your needs. Contact us today for a free quote.
COMMUNAL & DISTRIC HEATING
Gas boiler service
Coming soon
WATER TREATMENT
Coming soon
MONTHLY CHECKS
Coming soon
PPM
Coming soon
System balancing
Coming soon
FREE QUOTE
Or Call 0800 195 6468
HIU REPLACEMENT
coming soon
Tado Heating Programmer & Smart Radiator Thermostat

Schedule Install
Or Call 0800 195 6468
Thermal Store & Hot Water Cylinder Repair
REPAIRS from £89.99 + vat
We’re here to keep you comfy!

Thermal stores and hot water cylinders have become extremely sophisticated offering high efficiency to the user. Repairing and installing new units requires high levels of qualification, skill and experience. Modern systems can combine complex systems such as thermal solar, heat pump, thermal store, unvented hot water cylinders and digital heating controllers.
Our engineers are fully trained and qualified to design, install, repair and service your unit to the highest standard in the
quickest and most professional way, offering excellent value for money. Call us today to book your thermal store / hot water cylinder repair on 0800 195 6468.
£5 OFF
Must be presented at the time of service. Can not be combined with any other offer.
Schedule Repair
Or Call 0800 195 6468
Thermal Store & Hot Water Cylinder Service
Service for £89.99 + vat Only
We’re here to keep you comfy!

Most manufacturer’s warranties are only upheld if your renewable technology is regularly maintained, which is why it is important to ensure your hot water cylinders are serviced frequently by qualified engineers.
Our annual service for hot water cylinders and thermal stores include: Inspecting for signs of wear or damage, checks to see if the correct manufacturer’s parts are fitted, testing the temperature and pressure relief valves, removing the line strainer and cleaning the filter, checking the pressure of the expansion vessel, setting the correct incoming water pressure and issue an annual service certificate. With thermal stores we will aslo check the functionality of the flow switch, pump and fill the cylinder to the level required by manufacturer, we will also add inhibitor if necessary. Call us today to book your next service or for any enquiry on 0800 195 6468.
£5 OFF
Must be presented at the time of service. Can not be combined with any other offer.
Schedule Service
Or Call 0800 195 6468
HIU REPAIR LONDON
London’s #1 HIU specialists contractor.
HIU repairs London – We are well equipped and trained to provide HIU repair, service and maintenance in London and surrounds area.
Our vehicles are stocked with the most common used parts so we can usually complete your HIU repair on the same day.
R&B London HIU Engineers is trusted by UK’s largest Housing Associations, developers, Managing Companies and over 20k clients. We are also approved by HIU Heat Interface Unit manufacturers.
We do not charge extra for parking, call out, C charge or Ulez. It’s all included with our hourly repair rates.
Our friendly call centre is open 24/7 to answer all your enquiries.

Don’t just take our word for it
BOOK AN ENGINEER
Please fill in the form below our maintenance coordinator
will contact you back shortly.
HIU SERVICE LONDON
HIU SERVICE IN LONDON
HIU Service Checklist
Our HIU servicing helps keep your Heat Interface Unit (HIU) efficient, reliable and safe, and can reduce the risk of breakdowns and high heating and hot water bills. We carry out HIU service in London across communal and district heating systems using a structured checklist, and we provide clear findings and recommendations after every visit.
Typical checks include:
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Filter/strainer cleaning (primary and heating return)
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Visual inspection for leaks, corrosion and signs of wear
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Performance checks for hot water and heating delivery
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Primary and secondary temperature readings (including DHW temperature stability)
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Differential pressure checks (where applicable)
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Valve/actuator function checks
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Expansion vessel checks and re-pressurisation
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Safety and electrical checks
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Pump settings verified (radiators/UFH)
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Heat meter check
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Software/parameter checks for electronic HIUs where applicable
We offer three HIU service packages: Standard, Advanced and Premium. A full list of what’s included in each package is shown in the Pricing section below.
Comprehensive service report and service certificate (PDF)
After the visit, we provide a comprehensive service certificate in PDF format, suitable for residents and managing agents. The certificate includes:
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HIU make/model (and serial number where accessible)
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Full checklist of checks completed
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Recorded readings (temperatures, pressures and Delta P where applicable)
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Photos taken during the service
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Any faults identified, recommended actions and next steps
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Engineer name, date, and the recommended next service date
Block HIU servicing and combined HIU + MVHR servicing
We offer discounted pricing for block HIU servicing and planned maintenance programmes. For buildings with MVHR systems, we can also provide combined HIU and MVHR servicing at a reduced cost by coordinating visits and reporting in one schedule. Contact us with the site address and number of apartments to receive a tailored quotation.
HIU SERVICE COST
20% Off Labour Cost For Returning Customers
- Fixed price
- 8am to 9pm Monday to Friday
- C charge & Parking Included
- HIU Service Certificate
- HIU identification
- Primary filter clean
- Hot water test
- Hot water temp checks
- Heating test
- Heating temp check
- HIU Leak inspection
- HIU corrosion inspection
- HIU control settings
- HIU parts inspection
- Pressure Top-up
- Fixed price
- 8am to 9pm Monday to Friday
- C charge & Parking Included
- HIU Service Certificate
- HIU identification
- Primary filter clean
- Hot water test
- Hot water temp checks
- Heating test
- Heating temp check
- HIU Leak inspection
- HIU corrosion inspection
- HIU control settings
- HIU parts inspection
- Pressure Top-up
- Cylinder check
- Multi-point Temp
- Heat meter test
- Communal flow log
- Primary flow rates
- Primary flow temp
- Isolation valves operation
- DPCV calibration
- PICV calibration
- Expansion vessel test
- Earth Continuity test
- Power switch test
- Fixed price
- 8am to 9pm Monday to Friday
- C charge & Parking Included
- HIU Service Certificate
- HIU identification
- Primary filter clean
- Hot water test
- Hot water temp checks
- Heating test
- Heating temp check
- HIU Leak inspection
- HIU corrosion inspection
- HIU control settings
- HIU parts inspection
- Pressure Top-up
- Cylinder check
- Multi-point Temp
- Heat meter test
- Communal flow log
- Primary flow rates
- Primary flow temp
- Isolation valves operation
- DPCV calibration
- PICV calibration
- Expansion vessel test
- Earth Continuity test
- Power switch test
- Inhibitor top-up
- Washers replacement
- Radiators venting
- Radiators balancing
- Underfloor Heating calibration
- Manifold pins free
- Actuators testing
- UFH controls test
HIU Group Servicing Discount
- Online Booking
- Advanced HIU servicing
- Card payments accepted online
- Online Booking System
- Advanced HIU servicing
- Multiple days
- Four times slots
- Ideal for group of neighbours
- Ideal for managing companies
- Online payment for private customers
- Online Booking System
- Advanced HIU servicing
- Multiple days
- Four times slots
- Online payment for private customers
Combined HIU & MVHR Servicing
- Fixed price
- Standard HIU Servicing
- Standard MVHR Servicing
- Fixed price
- Advanced HIU Servicing
- Standard MVHR Servicing
- Fixed price
- Premium HIU Servicing
- Full MVHR Servicing
Don’t just take our word for it
BOOK HIU SERVICE
Please fill in the form below and our Maintenance Coordinator
will contact you back shortly to complete the booking.