Caleffi Boiler Repair
HIU London
Caleffi manufacture high-quality heat interface unit components and complete HIU packages found in residential and commercial heat network properties across London. Our engineers are trained on Caleffi HIU diagnosis, repair and annual servicing.
Common Caleffi Boiler / HIU Faults
Signs Your Caleffi Boiler / HIU Needs Attention
What Our Engineer Checks on a Caleffi HIU
Every Caleffi HIU fault call starts with a full systematic diagnostic — not a guess and replace approach. We follow a structured checklist to identify the root cause accurately.
Caleffi Boiler Repair HIU Process
Call or Book Online
Contact us 24/7. Tell us your address and that you have a Caleffi HIU fault and we will dispatch the nearest available engineer.
Engineer Arrives
A specialist HIU engineer arrives — typically within 1–2 hours for emergencies. We carry common Caleffi HIU spare parts on every van.
Diagnosis & Fixed Quote
We diagnose the fault, explain the cause in plain English, and give you a fixed price before any work begins. No hidden charges.
Repaired & Guaranteed
Most Caleffi HIU repairs are completed on the same visit. All work is backed by our 12-month parts and labour guarantee.
For Property Professionals
Caleffi HIU Servicing for Landlords & Managing Agents
If you manage flats with Caleffi HIUs, we provide annual servicing contracts, rapid-response repairs and full documentation for every visit. We work with landlords, managing agents and housing associations across London.
- Annual Caleffi HIU service certificates
- Priority same-day response for tenant callouts
- Written report after every visit
- Multi-property discounts available
- Direct tenant liaison if required
Frequently Asked Questions
Related Services
Why Choose Us?
Gas Safe Registered
Reg No: 217785 — certified and fully insured.
HIU Specialists
Experienced with Caleffi and all major HIU brands.
Same-Day Available
7 days a week including weekends.
12-Month Guarantee
All parts and labour guaranteed.
5-Star Reviews
Trusted by London landlords and residents.
Free Callback
Request a Callback
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or call us directly: 0330 520 1642
Book a Caleffi Boiler Repair HIU Engineer Today
Same-day repair, service and fault diagnosis across London.
Landlords, managing agents and housing associations welcome.