HIU Replacement London
New Installation Specialists
When repair is no longer the answer. We replace and install Heat Interface Units across London — all major brands, free survey, fixed-price quote, same-day installation.
Old, unreliable or condemned HIU? Obsolete parts? We will survey your property, recommend the right replacement and install it cleanly with full commissioning and warranty.
HIU units we replace and install across London
Survey & Quote
No obligation
Installation
Most jobs
Manufacturer Warranty
On new units
HIU Brands
All manufacturers
Time to Replace?
Signs You Need an HIU Replacement
HIUs typically last 15–20 years. If your unit is approaching or past that age, replacement is often more cost-effective than continued repairs. Here are the signs to look out for:
Benefits
Why Replace Your Old HIU?
Improved Efficiency
Modern HIUs are significantly more efficient, reducing your heat network energy consumption and bills.
Manufacturer Warranty
New HIU installations come with a full manufacturer warranty — typically 2 to 5 years parts and labour.
Parts Availability
A new HIU means parts are readily available for years to come — no more obsolete components or long waits.
Reliable Hot Water
Enjoy consistent, reliable hot water and heating without the constant risk of breakdowns.
How It Works
Our HIU Replacement Process
A clear, structured process from survey to commissioning. No surprises, no hidden costs.
Free Survey & Assessment
We visit your property, assess the existing HIU, pipework and connections, and identify the best replacement options for your heat network and flat layout.
Fixed-Price Quote
You receive a transparent, fixed-price quote covering the new HIU, all materials, labour, commissioning and documentation. No hidden costs.
Scheduling
We agree a date that works for you. Most HIU replacements are completed in a single day, minimising disruption to heating and hot water.
Removal & Installation
Our engineer safely isolates and removes the old HIU, installs the new unit, connects all pipework and commissions the system to manufacturer specification.
Commissioning & Testing
We balance flow rates, set temperatures, verify the DHW and heating circuits, check for leaks and ensure the new HIU performs to specification.
Documentation & Warranty
You receive the commissioning certificate, manufacturer warranty registration, user instructions and a full digital job report.
For Managing Agents
Block-Wide HIU Replacement Programmes
Managing a block with multiple ageing HIUs? We provide phased replacement programmes for property management companies and housing associations — survey, schedule, replace and document across your entire portfolio.
- Full block survey and condition assessment
- Phased replacement scheduling to suit budgets
- Tenant access coordination
- Volume pricing for multiple units
- Complete compliance documentation pack
FAQs
HIU Replacement FAQs
Related HIU Services
Book a Free HIU Replacement Survey
Fixed-price quote. Same-day installation. Full warranty.