020 4548 4226

HIU Installation London — Heat Network Specialists

Specialist HIU installation for new builds, refurbishments and unit replacements across London. We supply and commission all major HIU brands — Danfoss, SAV, Switch2, Caleffi, Alfa Laval and more — to the precise specifications of your heat network.

Done Wrong, It Costs Years

An HIU fitted incorrectly — wrong differential pressure settings, under-sized plate exchanger, poor pipe routing — will underperform from day one and fail early. HIU installation is specialist work that requires heat network experience, not just a plumbing qualification.

  • Incorrect PICV settings causing under-supply
  • Wrong plate exchanger selection
  • Inadequate primary flow rate
  • Poor commissioning — wrong temperature parameters
  • Non-compliant pipework and terminations
  • Missing or incorrect documentation for heat network operator

Specialist Installation, Properly Commissioned

We work with heat network operators, developers and property managers to deliver installations that meet the network's design requirements from day one.

  • HIU selection and sizing based on your heat network specs
  • Full unit supply or install-only on your procured unit
  • Correct PICV, actuator and plate exchanger commissioning
  • Primary and secondary hydraulic balancing
  • Integration with BMS or metering systems where required
  • Commissioning documentation and certification
  • Post-installation performance verification
  • Warranty registration and handover pack

Brands We Install

DanfossSAVSwitch2Alfa LavalCaleffiHeatwebThermal IntegrationRedan

The Benefits

Right First Time

Correct sizing, commissioning and documentation mean the unit performs to specification from day one.

Warranty Protected

Manufacturer-trained installation keeps your warranty valid and documentation ready for any audit.

Future-Proof

We factor in your building's heat demand and future load growth — not just today's minimum.

“Collide Group installed a new HIU in our building. The work was completed on schedule, to a high standard, and with minimal disruption to residents.”

— Managing Agent, Wandsworth

Installation from £1,950

Prices vary by brand, complexity and access. We provide a free written quote for every installation project. No obligation.

Request a Free Quote

Frequently Asked Questions

How long does an HIU installation take?
A standard single-flat HIU installation and commissioning takes 3–5 hours. Block installations are planned in advance and typically completed in batches.
How much does HIU installation cost?
HIU installation starts from around £1,950 inc VAT for a standard residential unit, depending on the brand, access and complexity. We provide free written quotes.
Which HIU brands do you install?
We install Danfoss, SAV, Switch2, Caleffi, Alfa Laval, Heatweb, Thermal Integration and Redan HIUs. We can supply the unit or install one you have already procured.
Do you handle commissioning?
Yes — full commissioning, performance testing, and documentation are included. We set the unit to the correct parameters for your heat network.
Can you replace an existing HIU like-for-like?
Yes. We regularly replace end-of-life HIUs on a like-for-like basis or upgrade to a more efficient equivalent model.

Get a Free Installation Quote

Speak to a specialist HIU engineer. Free quotes, transparent pricing, no obligation.