HIU Installation London
Heat Interface Unit installation and replacement across London. New-build developments, like-for-like swaps and upgrades. Manufacturer-approved engineers.
New HIUs and replacements, one team
New buildings and HIU replacements need different plans. We handle both, with manufacturer-approved engineers who choose the right unit and provide the full handover records.
- New developments: plant-room planning, mechanical and electrical sign-off, testing and handover
- HIU replacement: like-for-like swaps, upgrades, as little disruption as possible
- One contractor, with work done by our own team
- Full set of records when work is complete
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
Your service records, warranty registration and an 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
The way an HIU is installed affects future repair costs and comfort in the home. Our manufacturer-approved engineers install major HIU brands. Our own team handles the work and gives you the full records. You can also start a planned service 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 property 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.
