Your Trustworthy HIU Service Provider in London

Affordable & Efficient HIU Heating and Hot Water Solutions

Highly recommended

Bisham T. from Whitechapel, East London – E1. ( 20th of September )
Professional service. Tidy. On time. Full explanation of works performed. Highly recommended.

HIU inspection

Risa T. from Ealing, West London – W5. ( 11th of September )
Justin carefully went through my HIU system with a fine-toothed comb and figured out exactly what the issue was. He tested everything and was very thorough and meticulous in his work. The report he wrote up was very detailed and useful. He gave an honest assessment of what needed to be done to solve the problem and what was recommended for optimal health in the long term. He showed up on time, which was great, and even came back the next day to check things were working.

Superb service.

W.M from Wandsworth, South West London – SW18. ( 2nd of September )
Prompt, professional, transparent and knowledgeable expertise. Regular and clear communication throughout.



Fair, Transparent Pricing
Fixed/Hourly Repair Rates
Fixed Price Quotes
Discounted Group Rates
Spring/Summer Discounts
No Charge for Parking, CC or ULEZ
Card Payment Availability


Family-Run Since 2014
5 Star Rated Services
Qualified HIU Experts
Danfoss and Caleffi HIU Specialists
Most Common Parts in Stock
Fast Turnaround on Non-Stock Parts


Fully Insured
12-Month Parts Replacement Warranty
One-Hour Response to Online Inquiries
Expert HIU Engineers
Endorsed by Which? Trusted Traders

Ado Crespo
Great service.
Kieran Wang
Punctual, knowledgeable at a fair price. Recommend!
Extremely good and thorough HIU service. Our technician Justin was very helpful in identifying a radiator issue and give us solutions to fix it. He also explain all the aspects of maintaining HIU functioning in our home. Best service we ever experienced!
Chloe Selby
I really appreciated Justin's thorough work, explanation and professionalism. We have had repeated challenges with the HIU in our property, and it has been hard to find a professional we can trust. Following the visit and repair, I now understand the problem in more detail, why and how it happens, and who to call if it happens again. Justin arrived when he said he would, fixed the problem on site and charged a very reasonable price for his work. I highly recommend.
Susan “Suzee” Smith
We can really recommend Add Detail. The guys are knowledgeable, professional, friendly and do a very thorough job. An extremely efficient service. Thankyou.
Damián Goti
Very professional, easy to book and on time! Just sent an email and the next day I had someone to check the boiler. Paying is also easy, as you can choose credit card and also Google Pay accepted.
Bobby Digital
I contacted Add detail for a leaking HIU, I used the online booking service allowing you you to book time, date & send photos, the request was followed up the same day with an email allowing to add more details & confirmation of booking. The engineer arrived exactly at the time stated, they were very polite and professional & explained everything what he was doing. I am very pleased with the service provided & will be recommending them to my neighbours for annual servicing & maintenance.
They were very professional and came out the same day to sort out my heating system. Excellent service.
Daniel Dumbraveanu
Very professional


In 2014, two brothers started a business to provide dependable HIU services in London. Now, our family-run company is a known name in the community, with a team of trained HIU engineers available to help you with any HIU service or repair needs, making sure your home stays warm and comfortable.

Prompt HIU Repair Solutions

Encountering difficulties with your HIU system? We specialize in delivering timely HIU repair solutions. A considerable percentage of our initial visits successfully address and resolve heating or hot water issues within the first hour, thanks to our adept HIU engineers who excel in identifying and remedying common faults quickly.

Routine Maintenance for Your HIU Systems

Invest in regular maintenance to prevent potential problems and extend the life of your HIU system. Our team is equipped to assist you with comprehensive HIU services facilitating optimal performance throughout the year.

Contact Our Dedicated HIU Engineers

Are you in search of competent HIU engineers in London? We are here to help. Connect with us today through our contact form or by calling 02088224451 for professional HIU service and repair solutions in London. Rest assured, our services are fully insured, and we guarantee quality workmanship, offering you peace of mind with each project we undertake.


PayPal Logo


Looking for a fixed price quote for HIU repair? We will get back to you within 24 hours.



To find out more about our services or to discuss your requirements, get in touch.