London's Dedicated HIU Specialists
In-house engineers servicing, repairing, installing and supporting compliance for Heat Interface Units across London: for residents, landlords, block managers and developers.
What We Offer
HIU Servicing London
Annual HIU servicing by manufacturer-approved engineers. Fixed pricing.
HIU Repair London
Booked HIU repair across London. All major brands. In-house engineers.
HIU Installation London
New-build and replacement HIU installations. Developers, RMCs, individual properties.
Heat Network Compliance Support
Ofgem 2027 readiness for heat suppliers, block managers and developers.
Who we work with
Residents & homeowners
No heating or hot water from your HIU? Annual servicing? We work directly with residents across London.
Landlords
Keep your tenants warm and your HIU compliant with annual servicing, fast repairs and digital service records.
Block managers
Planned service contracts and clear records, with one contractor for all your properties.
Developers & RMCs
New-build HIU installations, replacement programmes, and Ofgem 2027 readiness for heat suppliers.
Why Heat Plex
Heat Interface Units aren't boilers. They require specialist knowledge that most general plumbers don't have. Our in-house engineers are manufacturer-trained on the major HIU brands, hold Gas Safe registration, and operate from our Battersea base with booked attendance across London.
- Our own engineers
- Manufacturer-trained on Danfoss, Alfa Laval, SAV, Evinox and more
- Battersea HQ, all London within M25
- booked attendance, fixed-price servicing
- Award-winning, Safe Contractor approved, SAV approved
Regulation and your service records
Plan maintenance. Check your network duties.
Ofgem regulation began on 27 January 2026. Existing relevant heat networks must register by 26 January 2027. The operator and supplier are responsible for identifying their duties.
The Heat Network Technical Assurance Scheme (HNTAS) is planned to launch in phases from 2027. HIU maintenance records can support your evidence, but a service visit does not meet every network requirement.
Check the current Ofgem registration guidance and government HNTAS guidance. Information checked 13 November 2026.
Frequently Asked Questions
A compact wall-mounted unit that connects an individual property to a communal heat network or district heating system. It transfers heat from the network into the property for heating and hot water, replacing the role of a traditional boiler.
Related Services
HIU Repair London
Booked HIU repair across London. All major brands. In-house engineers.
HIU Servicing London
Annual HIU servicing by manufacturer-approved engineers. Fixed pricing.
HIU Installation London
New-build and replacement HIU installations. Developers, RMCs, individual properties.
Heat Network Compliance Support
Ofgem 2027 readiness for heat suppliers, block managers and developers.
HIU question, repair, service or install?
One call, one accountable contractor. Booked attendance across London.
