HIU Installation London
Heat Interface Unit installation and replacement across London. New-build developments, like-for-like swaps and upgrades. Manufacturer-approved engineers.
Two install scenarios, one accountable contractor
Whether you're fitting HIUs into a new-build development or replacing a failed unit in a single occupied flat, the engineering reality is different — and so is the right specification. We handle both, with manufacturer-approved engineers and full handover documentation.
- New developments — plant-room coordination, M&E sign-off, commissioning, handover
- HIU replacement — like-for-like swaps, upgrades, minimal disruption
- Single accountable contractor — no subcontractors
- Full documentation pack on completion
Our installation process
Site survey
On-site assessment of plant room, pipework and unit specification.
Specification & quote
Fixed-price quote with the right unit for the building.
Manufacturer-approved install
In-house engineers, no subcontractors.
Commissioning & test
Full performance and safety testing on completion.
Handover with service records
Documentation pack, warranty registration and optional service plan.
What's included in an HIU installation
Site survey
Plant-room compatibility, plate sizing and pipework assessment.
Specification & quote
Manufacturer-approved unit selection with a fixed-price quote.
Supply
Genuine manufacturer units delivered to site.
Install
Manufacturer-approved engineer install, no subcontractors.
Commissioning & test
Full performance testing and documented commissioning.
12-month workmanship guarantee
Plus the manufacturer warranty (typically 2–5 years depending on brand).
HIU brands we install
Manufacturer-approved across the major HIU brands.
Danfoss
New build and replacement.
Alfa Laval
Plate exchanger specialists.
SAV Systems
SAV approved.
Evinox
Approved installation provider.
Heatrae Sadia
Supply and install.
Other brands
Most other brands covered — contact us to confirm.
Why Heat-Plex for HIU installation
A Heat Interface Unit is a long-life building asset — the install decisions you make at handover determine maintenance cost and resident comfort for the next 15 years. We install across the major HIU brands with manufacturer-approved engineers and a single accountable contractor — no subcontractors, full documentation, and the option to roll the building straight onto a planned-maintenance contract from day one.
- Manufacturer-approved across Danfoss, Alfa Laval, SAV, Evinox and more
- In-house Gas Safe engineers — no subcontractors
- Coordinated commissioning, sign-off and handover
- Optional planned-maintenance contract from day one
- 12-month workmanship guarantee plus manufacturer warranty
Frequently Asked Questions
A like-for-like replacement in an occupied flat typically takes 4–8 hours. New installs in new-build developments are scheduled around the M&E programme.
Related Services
Heat Interface Unit
London's dedicated HIU specialists — servicing, repair, install and compliance.
HIU Repair London
Same-day HIU repair across London. All major brands. In-house engineers.
HIU Servicing London
Annual HIU servicing by manufacturer-approved engineers. Fixed pricing.
Heat Network Compliance Support
Ofgem 2027 readiness for heat suppliers, block managers and developers.
Plan your HIU installation
Single accountable contractor for new builds, replacements and portfolio rollouts.
