HIU Services London: Expert HIU Repair & Service

Cost-Effective HIU Heating and Hot Water Solutions

HIU Service

Erwin D. from Plaistow, East London – E13. ( 21st of January )
The HIU service timing was very efficient, engineer that attended my property was accommodating to all my questions. Service value is definitely worth it.

Respectful and friendly

Michel B. from Stockwell, South West London – SW9. ( 20th of January )
The service guy came out within 24 hrs of me calling them, knew to find the solution to the problem and fixed it. He was respectful and friendly, explaining along the way what he observed and gave a few tips on top of it. Thanks! Great service

Efficient service

Neli V. from Royal Victoria, East London – E16. ( 5th of January )
Excellent company, very prompt and efficient service. Sorted out problem straight away and price was reasonable. Would highly recommend and will keep using their services. Really impressed.

Neli Valkova
Excellent company, very prompt and efficient service. Sorted out problem straight away and price was reasonable. Would highly recommend and will keep using their services. Really impressed.
Sofia Costa
Fantastic service provided by Add Detail! After two terrible experiences with other companies, I discovered Add Detail through a Google search. I messaged them on WhatsApp and received a prompt reply. A few days later, Justin came over and delivered impeccable service. Despite being initially informed that I needed a full HIU replacement, Justin skillfully replaced the malfunctioning pump, leaving everything fully operational! He was incredibly nice and helpful. I plan to rely on Add Detail for all my future HIU servicing needs. I highly recommend them.
Ahmed Saad
Add Detail Ltd are very professional. Justin was on time, did the HIU annual service by thoroughly checking the HIU and the radiators. He also fixed a problem with the hot water, without extra charge. Add Detail did a great service at a fair and reasonable price. I will highly recommend them.
Veeraj Mewasingh
Prompt, efficient, professional service. I’m an overseas landlord but communicating with Sigis and booking jobs have always been easy. Had to have my HIU replaced recently and glad to have placed my trust in them.
Artemiy Sobolev
Everything was smooth, engineer was friendly and helpful, resolved the problem we had
Charlie Davison
Excellent service and good value
The engineer from Add Detail is very punctual, professional and efficient. It's the best HIU service experience I've had. Highly recommended!!
Prabhu Galiveti
Had our HIU serviced. Very prompt to communicate and professional. Charged as per the quoted price and provided quote for recommended works. Thoroughly recommend.
Lucie Gutfreund
Justin from Add Detail attended to my flat to install new smart thermostats for my underfloor heating and to help me map the manifold actuators with correct areas of the flat, and also checked my HIU. Justin patiently explained everything. Previously I had horror experiences with a large contractor imposed on us by our building's freeholder/ their managing agent, so I am so glad I have found Justin. Also very fair pricing per hour. Have recommended Add Detail HIU to neighbours in our building needing help as well.
Isaac Perez
Excellent service and very professional engineers


HIU Services in London

Established in 2014 in London, ‘Add Detail Ltd’ is a recognized name in HIU services within the London community. Our team of skilled engineers is ready to assist with all your HIU service, repair, and maintenance needs, ensuring your home remains warm and comfortable.

Specializing in HIU units, our experts have in-depth knowledge of various types and brands, enabling them to accurately diagnose and resolve specific issues. This expertise enhances your HIU’s efficiency, reduces energy costs, and extends its lifespan, helping to avoid costly replacements.

We also provide detailed digital reports and maintain a comprehensive service history, essential for maintaining optimal performance. Choosing ‘Add Detail Ltd’ means having reliable support for any heating or hot water problems, giving you peace of mind.

Count on us to safeguard the safety, efficiency and longevity of your HIU – a smart choice for those in London seeking expert HIU care.

Fast Responses To Your HIU Enquiries Are Guaranteed!

Connect with us for professional HIU service and repair solutions in London. Reach out via our contact form or call 02088224451. Our services are fully insured, ensuring quality workmanship and peace of mind with every project. Learn more about HIUClick here.

12 Tips To Keep HIU In Tip-Top Condition

  1. HIU annual service (read more)
  2. HIU specialist company to service and repair that uses only original parts  (read more)
  3. HIU fitted with an Inline water scale reducer (read more)
  4. HIU secondary heating water quality check and inhibitor top-up (read more)
  5. HIU connected to a smart thermostat (read more)
  6. HIU secondary heating system with magnetic filter (read more)
  7. HIU heating and hot water controls explained by a HIU specialist (read more)
  8. HIU performance is affected by dripping taps and poor plumbing in the apartment (read more)
  9. HIU connected to radiators and importance of correctly working radiator valves, radiator bleeding and heating system balancing (read more)
  10. HIU connected to underfloor heating and importance of correctly working manifold, actuators, flow meters, control center wiring and room thermostats (read more)
  11. HIU repair and service record keeping and staying with the same HIU service company over the years offers several important benefits (read more)
  12. HIU problems for heating and hot water should be looked as soon as possible (read more)


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