Expert HIU Service, HIU Repair & HIU Replacement in London
24/7 Heat Interface Unit engineers & MVHR specialists for communal and district heating schemes. Fast, reliable, manufacturer-trained. Our specialist engineers diagnose faults quickly, explain the issue clearly, and help restore hot water and heating with minimal disruption.
Need Urgent HIU Repair?
Fast support for no hot water, no heating and HIU breakdowns across London.
Emergency support available 24/7
off labour cost
On all HIU service and HIU repair labour for returning customers. T&C's apply.
Trusted by
Residents & Agents
Covering
Greater London
Specialists in
HIU Service & Repair
Support for
Repairs & PPM
Professional HIU service, HIU repair and communal heating support
Comprehensive HIU service, HIU repair, HIU replacement, MVHR and cylinder maintenance across London.
HIU Service
Professional HIU service in London including filter cleaning, performance checks and service certificates.
HIU Repair
Fast HIU repair in London for no hot water, no heating, leaks, low pressure and breakdown faults.
HIU Replacement
HIU replacement in London with options for older, unreliable or uneconomical-to-repair units.
MVHR Servicing & Repair
Domestic ventilation maintenance and repair to support clean airflow and efficient performance.
HIU Commissioning
Professional commissioning and validation of newly installed HIUs and related heating controls.
Cylinders & Thermal Stores
Specialist fault diagnosis, repair and replacement for hot water storage systems in London.
Real 5-star reviews from London residents
- ★★★★★
"Mustafa was amazing. Polite, professional, honest and very effective. Always offers preventative feedback. Cannot recommend highly enough."
— Manuel Del Aguila
- ★★★★★
"Big thanks to George for fixing my heating yesterday! Super friendly guy... proved the HIU was fine. Now all my radiators are working perfectly."
— Donatas Matulaitis
- ★★★★★
"Had no heating. Mustapha visited - one of the best and politest engineers I've come across. Investigated in detail and didn't leave until fixed."
— Asim Lutfullah
- ★★★★★
"Mohammad is a very experienced and patient engineer. He fixed the HIU issue for me which lasted for two months and explained the reasons."
— Hao
- ★★★★★
"Very pleased with the service from Rachik at London HIU Engineers, he turned up promptly and he has done a great job at a fair price."
— Suzanne Dawson-Smith
- ★★★★★
"It is a miracle! Mustafa has saved the day. This brilliantly competent man resolved the issues and got my boiler and radiators working again."
— Maddy D
- ★★★★★
"They fixed the problem with our HIU system that others could not identify for months. Incredibly professional. Highly recommended."
— Mathew Edwards
London's HIU service and HIU repair specialists
At R&B London HIU Engineers Limited, we are experts in the maintenance of HIU Units. Our manufacturer-trained engineers possess the specialised technical knowledge required to safely diagnose, repair, and conduct comprehensive HIU servicing.
From a complete loss of hot water to pressure drops and strange noises, our rapid response team provides HIU repairs across London. We stock components for major brands including Danfoss, Evinox Modusat, and Caleffi allowing us to achieve a high first-time fix rate.
Whether you are a private resident needing emergency help, or a managing agent requiring large-scale block HIU servicing and MVHR maintenance, we provide transparent, fixed-price options where applicable and a 12-month workmanship warranty on all repairs.