HIU Replacement & Installation Services London: Quality and Reliability Guaranteed

Thoroughly recommend

Prabhu G. form Wapping, East London – E1. ( 17th of November. )
Had our HIU serviced. Very prompt to communicate and professional. Charged as per the quoted price and provided quote for recommended works. Thoroughly recommend.

Big thanks

Alex from Clerkenwell, Central London – EC1. ( 5th of November. )
I had to replace my thermostat and the team arranged the appointment and replacement quickly. The engineer was very friendly and efficient. Big thanks.

Efficient

Jerome G. from Greenwich, South East London – SE10. ( 2nd of November )
Quick to setup an appointment, quick to fix, fair prices. Can't ask for more. Top!

Danfoss FlatStation 7 Series HIU Replacement & Installation in London

Add Detail offers comprehensive HIU (Heat Interface Unit) replacement and installation services in London. Benefit from our competitive, fixed-price offers starting at just £3330+vat (£3996), accompanied by a 3-year guarantee on both parts and labour.

Is It Time to Consider HIU Replacement?

If your heating system has been in service for 10 to 15 years, or if you’re facing frequent breakdowns, then it’s likely time to seriously consider an HIU replacement. Operating with an outdated or overworked Heat Interface Unit (HIU) can take a toll on your system’s efficiency and lead to elevated energy costs.

Danfoss FlatStation 7 Series HIUs for Reliable Control

Specializing in the installation and replacement of Danfoss FlatStation 7 Series Heat Interface Units (HIUs), we offer units designed for effective management of heat transfer, pressure, temperature, and flow. Engineered in Denmark, these HIUs are made-to-order and typically require a 4-6 week delivery period.

Quality and Expertise You Can Rely On

With Add Detail, your HIU installation or replacement is in expert hands. Our highly skilled technicians adhere to the highest quality standards, ensuring your new HIU delivers both efficiency and reliability. Call us on 02088225541.

Transparent, Fixed-Price HIU Quotes in London

We provide free, no-obligation, fixed-price quotes for all HIU replacement and installation services across London, with absolutely no hidden fees.

What to Expect During Your HIU Replacement or Installation in London

If you’re considering an HIU (Heat Interface Unit) replacement or a new installation, it’s important to know what the process involves. Here’s what you can expect when you schedule an HIU replacement or installation service with Add Detail:

  1. Removal of Existing HIU: Our skilled technicians will safely remove and dispose of your existing HIU, adhering to all environmental regulations.
  2. Piping Adjustments: If necessary, we’ll make modifications to your existing piping system to accommodate the new HIU.
  3. New HIU Installation: We’ll proceed to install the new HIU model you’ve selected, ensuring it’s securely placed and connected.
  4. System Connections: Our team will connect your new HIU to the existing electrical and plumbing systems, making sure all connections are secure and leak-free.
  5. System Testing: Once installed, we’ll refill the HIU and run tests to ensure it’s performing optimally in terms of heat transfer, pressure, temperature, and flow.
  6. Site Cleanup and Documentation: After confirming everything is in working order, we’ll clean up the installation site and provide you with all necessary guarantees and warranties for your new HIU.

By providing a comprehensive service, Add Detail ensures that your HIU replacement or installation in London is as smooth and stress-free as possible.

Contact us today to discuss your specific HIU replacement and installation requirements in London. Learn more about HIU – Click here.

Looking to improve your heating and hot water system? Click the link to see our top recommended products.

CALL US NOW

020 8822 4451

Great and polite service.

Jacqui W. from Bermondsey, South East London – SE1. ( 16th of August )
Great and polite service. New HIU installed last year and recently had a service. I appreciate the time spent explaining what the have done and answering any questions.

Excellent service.

Katie W. Barking, East London – IG11. ( 25th of August )
I was struggling to find HIU specialists and since this is the first time I had to make a call out, I was very reluctant to book just anyone. I relied heavily on reviews, which is why I am taking the time to write one for anyone else in my position. I had a great experience with ADD DETAIL. They were very efficient in communicating with me, came out the next day and Justin sorted the problem very efficiently and was very knowledgeable. Will definitely contact them in the future. ADD DETAIL also provide a decent quote!

Superb service.

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

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.

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 Service

Issac P. from Canning Town, East London – E16. ( 2nd of October )
Excellent service and very professional engineers.

Checked my HIU

Lucie G. from Kilburn, North West London – NW6. ( 20th of October )
Justin from Add Detail attended to my flat to install new smart thermometers 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.

Would recommend 100%

Djenaba F. from Bow, East London – E3. ( 26th of October )
Very responsive and professional team. Would recommend 100%.

Efficient

Jerome G. from Greenwich, South East London – SE10. ( 2nd of November )
Quick to setup an appointment, quick to fix, fair prices. Can't ask for more. Top!

Thoroughly recommend

Prabhu G. form Wapping, East London – E1. ( 17th of November. )
Had our HIU serviced. Very prompt to communicate and professional. Charged as per the quoted price and provided quote for recommended works. Thoroughly recommend.

Big thanks

Alex from Clerkenwell, Central London – EC1. ( 5th of November. )
I had to replace my thermostat and the team arranged the appointment and replacement quickly. The engineer was very friendly and efficient. Big thanks.

Good job!

S. Webster form Haringey, North London – N6. ( 8th of August )
Great service. They gave a full quote in writing and stuck to the agreed work. They did a good job. Would use again.

A professional company. Highly recommended.

Daniel D. from Hammersmith, West London – W6. ( 27th of July )
I made contact because of a lack of hot water. An inspection was arranged very quickly and the fault identified. A reasonable quote was accepted and the repair was carried out speedily.

Great service.

Nicky F. from Highgate, North London – N6. ( 4th of July )
Reliable honest knowledgeable reasonably priced. Good communication. Nice guy! Great service . Highly recommended

Excellent service and reasonable price

Sally H. from Archway, North London – N19. ( 4th of May )
Excellent service. Justin arrived on time and identified and fixed the issue swiftly. He also have me some tips on what to do if the issue arose again. Thanks Justin. Highly recommend.

Good Job done well

S. Meade from Hoxton, North London – N1. ( 20th of May )
Arrived ahead of time, respectful of property, good job done well.

Will definitely use again

Kalvin J. from Wembley, North West London – HA0. ( 25th of May )
They scheduled a service over the weekend which was useful. Competitive price and great service. Provided a full report quickly.

Amazing

Season C. from Old Street, North London – N1. ( 3rd of May )
Very professional throughout Pre and post appointment. I got a detailed report with photos attached which gives so much clarity. Offers night and weekend slots. Highly recommended

HIU Service

K. Wang from Bromley-By-Bow, East London – E3. ( 11th of May )
Punctual, knowledgeable at a fair price. Recommend!

Fantastic service! Will use again

Christiana M. from Canary Wharf, East London – E14. ( 2nd of May )
Great service organising the visit and answering my questions, very friendly, efficient and polite engineer who provided me with all the information I needed, easy payment options and the quote they provided me with (and charged me!) was more competitive than other providers I contacted. Will definitely use again!

Very pleased

Stefani S. from Islington North London – N1. ( 25th of April )
Very quick and reliable service! Very pleased, will definitely use again if needed.

A very reasonable price

Chloe Selby from Holloway, North London – N7. ( 12th of April )
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.

Knowledgeable HIU company

Susan Smith from Canning Town, East London – E16. ( 31st of March )
Add Detail Ltd are a very professional and knowledgeable HIU company. Their service/repair is always carried out thoroughly, by a team that are conscientious and committed. Respectful of your home too. Can thoroughly recommend.

Google Pay accepted

Damian G. from Rotherhite, South East London – SE16. ( 20th of March )
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.

HIU servicing & maintenance

Matt B. from Canning Town, East London – E16. ( 16th of March )
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.

Recommended!

Subramanian from Wandsworth, South West London – SW18. ( 12th of March )
Timely service and identified the problem correctly. Flexible when appointment changed. Recommended!

They explained what was happening

Alfredo M. from Kings Cross, Central London – WC1. ( 1st of March )
Great experience! Their work is very clean, they explained what was happening and how the new HIU system works. Would recommend to anyone.

Finally fixed the HIU

Odile from Highgate, North London – N6. ( 14th of February )
Justin went beyond and above excellent customer service. I locked both of us outside the flat 24 hours after having changed the lock. Not only did he stay trying to help, but he waited with me for 1 hour for a locksmith to open the door. He was very polite and at no time showed any frustration. I greatly appreciated his non judgement and his support, helping me accept things like this can happen. Once we eventually could get in my flat, he finally fixed the HIU. Although I was his last customer, no other service and utility providers would have waited while being so calm and polite about the situation.

Really professional HIU company

M. K. from Greenwich, South East London – SE10. ( 5th of February )
Adddetail were the third company I asked for help after previous 2 were incapable of fixing an HIU leakage. After the second company wanted to replace part of HIU for 530 GBP, I called Adddetail who were in the area. They spent 15 minutes and charged only 36GBP in total for fixing. Really professional.

Knowledgeable HIU Engineer

Lizzie B. from Canning Town, East London – E16. ( 24th of January )
The engineer arrived ahead of time and provided us with a very professional service. He was very knowledgeable and advised us about radiators which weren’t working properly. He was very polite and friendly. Thank you for coming so promptly.

Prompt Service

David H. from Hornsey, North London – N8. ( 23rd of January )
Good price, clear communication and prompt service. Highly recommend.

Excellent HIU Service

Adam JM. from South Tottenham, North London – N17. ( 22nd of January )
HIU Service, Excellent service, on time, efficient, professional, explained what was happening, happy to answer questions. Highly recommended. Many thanks.

HIU service

Grace S. from Stockwell, South West London – SW9. ( 6th of January )
Very responsive, professional, and did a HIU service for us. Thank you!

Their communication is consistently prompt

Steven Brown from Greenwich, South East London – SE10. ( 28th of December )
These guys are very, very good. Up to now, we have struggled to find people who really know what they are doing with HIUs. The guys at Add Detail specialize in these systems, and know everything there is to know about them. Apart from that, they are a truly professional outfit. Their communication is consistently prompt and clear, they are reliable, and extremely thorough. You are never left guessing; they always make it clear what they will do, when they will do it, and what it will cost: and they stick to it. They are also very nice guys, and happy to share their knowledge so that you understand your HIU system better. I cannot recommend them highly enough: really great.

HIU unit to repair or replace

Olivia from Isle of Dogs, East London – E14. ( 19th of December )
Great service from Add detail. Helped me to install the unit within a week's time as it just got colder. Sigis has been very responsive during both phones and emails. And Justin & Dave were both very punctual - during both inspection and installation. I would recommend their service to anyone who lives in apartment with HIU unit to repair or replace. Great value, hard working engineers and great customer service!

Very happy with HIU service

Charlotte B. from Canary Wharf, East London – E14. ( 9th of December )
On time, professional - performed a good job and did not take any shortcut. Very happy with HIU service received - recommended to all our neighbors. We will definitely use again.

Professional and fair priced

Richard W. form Colindale, North west London – NW9. ( 28th of November )
Excellent HIU servicing and repairs carried out by courteous and knowledgeable engineers. Cannot recommend Add Detail more highly- professional, tidy and fair priced.

Highly recommend

Jesse Green from Highgate, North London – N6. ( 11th of November )
Very efficient and thorough service by a friendly and knowledgeable engineer. Highly recommend.

I've already recommended Add Detail

Anne M. from Wapping, East London – E1. ( 6th of November )
Very happy with the HIU service provided. The engineer took time to review my heating system thoroughly and I had confidence that he knew what he was doing. He was punctual, efficient and courteous I'd definitely recommend this service and I've already recommended Add Detail to my neighbours.

Absolutely seamless and professional company

Hannah Green from Wandsworth, South West London – SW18. ( 31st of October )
Add Detail serviced all the HIU units in a block of flats where I have a tenanted property, organised by the management company. They arranged access with the tenant and then sent me a full report with works required. I was able to accept the quote online and then they arranged a second visit directly with the tenant again and sent me photos of the work with the invoice when all was completed. Absolutely seamless, professional and well-priced compared with companies I have used for this property previously. Fully recommend and wish I had come across them sooner. Thanks.

Fitting a new HIU

Tanisha Pearce from Stratford, East London – E15. ( 25th of October )
Add Detail did an excellent job of sourcing and fitting a new HIU in our residence. Their technicians were timely, polite, tidy and efficient. Job was completed within the day. Would highly recommend them.

Fixed two problems with the HIU

Ahmed Saad form Hammersmith, West London – W6. ( 16th of October )
Add Detail Ltd are very professional guys. Justin was on time, fixed two problems with the HIU and did thorough HIU checking. Add Detail did great service at a fair and reasonable price. I highly recommend them.

HIU smart meter

Sivilay Sayavong from Wandsworth, South West London – SW18. ( 7th of October )
Add Detail changed my HIU smart meter and they were very good and professional.

Serviced the HIU unit

Gwen W. from Rotherhithe South East London – SE8. ( 27th of September )
Great professional service from start to end. My HIU pressure was very low and I needed to ensure the heating could work in the lead up to the colder months. I contacted Add Detail via the chat service on their website, managed to secure an appointment for the next day. Justin, the engineer who attended and serviced the HIU unit was happy to provide explanation to all my questions. He tidy up after the work and did not leave a mess (esp when compared to other engineers that have attended in the past). All the paperwork (invoice + report) was emailed through before he drove off. It was a very smooth experience, no chasing required and payment was made after attendance. It was also cheaper when compared to one the management company recommended.

Would definitely recommend using this company

Harvey G. from Watford – WD18 ( 15th of September )
Very friendly staff from the initial enquiry to the repair. Would definitely recommend using this company. Will be sure to use this company again when it's time to service.

HIU Service was professional

Slawomir P. from South West London, Isleworth – TW7. ( 7th of September )
Service was professional and I can recommend company for everyone in need with HIU problems.

They have provided a fantastic service

Eduardor G. from Poplar, East London -E14. ( 2nd of September )
I contacted Add Detail HIU this afternoon about repairing my HIU unit. A few hours later it is up and running! They have provided a fantastic service. Very quick in replying and accommodating. I thoroughly recommend.

Good HIU Service

Dov from Mill Hill, North West London – NW7. ( 23rd of August )
The engineer arrived on time, he was polite and professional. He conducted the service to our HIU unit, and I was pleased with his work. I would happily recommend Add Detail if asked.

Best price to replace two HIU parts

Carsten Hartmann from Wapping, East London – E1. ( 1st of August )
Very knowledgeable HIU engineer, who also advised me how to put inhibitor into the heating water system to prevent corrosion and malfunction. BEST PRICE: £120 INCL. VAT TO REPLACE TWO HIU PARTS

They came to install a new HIU

Andres Puusaar from Deptford, South East London – SE8. ( 19th of July )
Add Detail were a pleasure to work with. They came to install a new HIU unit in my flat. They arrived on time and were able to finish the work faster than expected. They were also able to work out a preexisting problem within the pipes that other service providers had failed to fix.

Friendly HIU technician

Baptiste Laversanne from Canning Town, East London – E16. ( 13th of July )
Good service and timing. Friendly HIU technician. Would recommend!

Fixed my HIU in no time

Maggie M. from London, Brentford – TW8. ( 4th of July )
Great customer service, they were responsive and easy to schedule. Sigis was very knowledgeable and polite engineer, fixed my HIU in no time. Highly recommend it,I will be happy to use them again

Good service and advice given.

Jacqui W. from Elephant and Castle, South East London – SE1. ( 11th of June )
HIU CHECK Good service and advice given.

Incredibly reliable and professional

Kate M. from Wandsworth, South West London – SW18. ( 23rd of May )
BRILLIANT! I highly recommend Add Detail! Incredibly reliable and professional and very quick to respond to any queries.

I would highly recommend using this firm.

Alan K. from Canary Wharf, East London -E14. ( 11th of May )
We had considerable problems getting someone to deal with a leak in our HIU unit until we came across ADD Detail.com. They came to have a look and quickly identified the problem and sourced the parts needed. When the parts arrived they came to deal with the issue in a very friendly, efficient and professional manner. Dealing with HIU units are quite a specialist area and many plumbers or heating engineers do not like to repair them. If you have a problem with an HIU unit, it is worth getting in Add detail to have a look because they have vast experience dealing with these types of units. I would highly recommend using this firm.

Very highly recommended HIU Services

Jamie from Bermondsey, South East London – SE16. ( 3rd of May )
Add detail it’s been looking after my heating and hot water system HIU in the last year and they are amazing, very highly recommended. Justin is always reliable. Thank you guys for the good work.

Would recommend!

T. Pasu from Hammersmith, West London – W6. ( 16th of April )
Very responsive and professional, able to identify HIU problem very quickly while giving thorough explanations to someone with 0 knowledge in the area. Would recommend and work with them again moving forward!

Add Detail the level of customer service was great

Maria H. from Uxbridge, West London – UB8. ( 6th of April )
I have had such a good experience with Add Detail the level of customer service was great I had previously been trying to get my heat unit fixed by a different company for over 5 weeks! With Add detail I made one phone call and the next morning my unit was fixed within a few hours - the engineer was excellent and spent time explaining to me what work he was undertaking and answered all my questions - this is a great company I would highly recommend them

Justin (engineer) arrived on time and rectified my HIU issue.

Sofina C. from Slough – SL1. ( 30th of March )
Fabulous service from Add Detail Ltd, from customer service, Sigis, very polite, & prompt responses to emails. Justin (engineer) arrived on time and rectified my HIU issue. Highly recommend Add Detail Ltd, I will definitely use Add Detail in the future. Thank you

Knowledgeable, courteous and very professional.

Roy L. from Hackney, East London – E2. ( 22nd of March. )
Just great service. Good communication about the problem and timing of the engineer arrival. Very neat work (engineer wore overshoes), no mess at the location of the repair either. Knowledgeable, courteous and very professional. Would recommend without hesitation.

Will definitely use again.

Carole E. from Old Street, Central London – EC1. ( 10th of March )
10 OUT OF 10 So easy to deal with! Made an appointment, listened to my concerns, turned up when arranged and sent a report. Will definitely use again. Thank you!!

I will use them for all future services of my HIU.

Natalie C. from Bermondsey, South East London – SE16. ( 2nd of March )
Fantastic service. Easy to book, quick appointment, friendly service and resolved all issues as well as providing helpful advice. I would definitely recommend and will use them for all future services of my HIU.

Handled the issue with my HIU unit with minimum fuss.

Ilan Shaki form Uxbridge, Middlesex – UB8. ( 24th of February )
Made contact with Add Detail through a recommendation. Found Sigis and Justin to be very prompt and professional and handled the issue with my HIU unit with minimum fuss. Also their prices are reasonable. Would highly recommend.

Very professional and know the product.

B. Parikh from Wembley, North West London – HA0. ( 17th of February )
Very professional and know the product.

A professional HIU company.

Ahmed S. from Hammersmith, West London – W6. ( 9th of February )
A professional HIU company. Add detail is very professional. The HIU specialist came on time and fixed the problem from first visit. A very good job. Highly recommend them.

Hands down the best engineers I've come across!

Shan from Slough – SL1. ( 5th of February. )
Having a recently failed HIU unit, contact was made via Whatsapp, professional communication, clear prices given, examples of previous work provided. Met Sigis and Justin, highly recommended. I highly recommend this company.

Resolved my issue quickly

Fabrice B. from St. Katherine’s & Wapping, East London – E1W. ( 25th of January )
Booking confirmed same day on WhatsApp. Arrived next day on time (even a bit early) and resolved my issue quickly and effectively at reasonable price. Will definitely use again. Thanks.

Adddetail were really easy to use

Tamsin from Finsbury, North London – N1. ( 19th of January. )
Very happy customer. Adddetail were really easy to use, they got in touch immediately and booked an appointment for me within 2 days. Justin did an excellent job of servicing my HIU, he spent time investigating the cause of my heating issues and didn't leave until it was resolved. He also gave me advice on how to keep the system running well in the future. He arrived on time and left the area clean and tidy. I'd be happy to use Adddetail again next time

I will use the service again.

Tim L. from Greenwich, South East London – SE10. ( 13th of January )
Professional HIU service. Knowledgable engineer. Good service. Will use the service again.

High quality workmanship

A. Biswas from Kings Cross, North London – N1. ( 5th of January )
Great service - super easy to deal with, very straightforward and a high quality workmanship when both repairing an old HIU and when supplying and installing a new one. Many thanks to Justin and Sigis - fantastic!

Punctual and pleasant engineer!

Oliver P. from Hammersmith, West London – W6 ( 29th of December )
Swift and effective service. Punctual and pleasant engineer! Highly recommend.

HIU service - great service

Meera Patel from Walthamstow, East London – E17. ( 4th of December )
HIU service - great service, professional and efficient!

Very professional and attentive

Lewis from Lewisham, South East London – SE13. ( 22nd of November )
HAPPY CUSTOMER Very professional and attentive, I would recommend their services

Used this company both to carry out the annual HIU servicing

Rocio from Poplar, East London – E14. ( 15th of November )
HIU SERVICING AND REPAIR - GREAT SERVICE! Used this company both to carry out the annual HIU servicing plus a subsequent repair. Sigis was great at providing a timely quote and kept me updated of schedule at all times. Justin was professional, very clean/tidy in all his work and took the adequate time, which makes a big difference! Prompt invoicing and ample payment facilities. Would definitely recommend to friends, neighbours or any local business contacts.

Work was clean and not rushed.

Jazz Sian from West Ham, East London – E16. ( 11th of November )
Had my HIU service done for the 1st time with these guys. Work was clean and not rushed. Had an issue with starting up my heating which was resolved and also an issue with a leak which required further work which I will be asking these guys to carry out for me. Was recommended these guys and I will be doing the same. Great work.

HIU service was quick and efficient

Anna S. from Walthamstow, East London – E17. ( 9th of November )
HIGHLY RECOMMEND. WILL USE AGAIN. HIU service was quick and efficient, very lovely engineer who even took his shoes off to walk around my flat which I appreciated a lot. The company offered a discount for group bookings so was a very affordable service. Identified the issue so fingers crossed when the part is ordered it will solve my problems. Will be booking with them aga

This was our first experience using Add Detail Ltd to service our HIU

Susan S. from Canning Town, East London – E16. ( 3rd of November )
AN EXCELLENT SERVICE This was our first experience using Add Detail Ltd to service our HIU boiler. The company are very efficient when booking an appointment, offering discount if other neighbours also book a service. The engineer carried out a thorough examination of the boiler and adjusted/checked settings as necessary. He was also very courteous. We would have no hesitation in recommending and using Add Detail Ltd in future. Thank you.

Leaky HIU repaired successfully.

Doug from Archway, North London – N19. ( 17th of October )
Leaky HIU repaired successfully. Excellent communication and availability. Fair price and easy to pay the invoice. Would use again!

I will certainly use this company again.

Bill Frost from Highgate, North London – N6. ( 12th of October )
A good, prompt and efficient service. I will certainly use this company again.

Completed the job with great professionalism

Urtopia Estate Agents from Deptford, South East London – SE8. ( 2nd of October )
As an estate agents and having recently taken on a number of properties with HIU systems, there have been occasions that our regular plumbers could not repair the problems our tenants had encountered. This is when HIU Repairs Services really shine, they were responsive and completed the job with great professionalism. Our tenants were totally satisfied!!! I would highly recommend them. Alan, Urtopia Property Agents

Would certainly recommend Add Detail to anyone.

Nick P. from Wapping, East London – E1W ( 28th of September )
Came across Add Detail on a search of the internet for a company that could service my HIU in the apartment. Set up an appointment and at their request sent their details to others in the development who had a similar requirement. Others join the list which resulted in a discount for all involved. Service was quick and efficient. Would certainly recommend Add Detail to anyone.

Expert service for my HIU issues

Louise G. from Rotherhite, South East London – SE16. ( 20th of September )
EXCELLENT COMPANY - EXPERT IN HIU Add Detail have provided a professional, expert service for my HIU issues as well as a good standard service. They are always looking for ways to improve the unit and provide a fair, transparent costing before you accept a job so there are no surprises. I would highly recommend.

STRAIGHTFORWARD AND HONEST REPAIR SERVICES

George P. from Canada Water, South East London – SE16. ( 11th of September )
STRAIGHTFORWARD AND HONEST REPAIR SERVICES Used Add Detail LTD for an unvented cylinder service, then some follow up work for repairs needed after service was done. Good communication and fair prices. Completed to good standard. Would recommend and would use again.

GREAT HIU SERVICE

Christaine K. from Wapping, East London – E1W. ( 9th of September )
GREAT HIU SERVICE Justin arrived during the time specified and was efficient, pleasant and knowledgeable. The HIU service was well priced and thorough. I will definitely use Add Detail again and I have recommended them to our residents association and also to our building management company.

Very pleased with the work carried out.

Beth from Wandsworth, South West London – SW18. ( 8th of September )
Adddetail Ltd is a 5 star++ renowned company, highly recommended. They are professional, reliable, honest, friendly, polite, gave genuine advice on other aspects related to the job with an excellent customer care approach. Very pleased with the work carried out at a fair price. Adddetail Ltd's knowledge of HIU is astute, their workmanship is immaculate and standard of performance is high. Definitely would use again and recommend to others.

No hidden costs or unforeseen issues.

Kacper from North Woolwich, East London – E16. ( 11th of August )
Great service, very responsive, everything was done as promised and on time. No hidden costs or unforeseen issues. I recommend wholeheartedly.

Excellent service of our HIU and cylinder.

James Spencer from Canary Wharf, East London – E14. ( 6th of July )
Excellent service of our HIU and cylinder. Friendly, professional, and good price for the job. Recommended.

I can't recommend enough these guys.

Petros C. from Barking, East London – IG11. ( 3rd of July )
I have a HIU for hot water and heating. My unit needed a repair but it was impossible to find which spare part needs replacement. Tried 3 different specialists before turning to this company and each guy suggested a different part being the faulty one. Sigis from Add Details Ltd fixed my water issue on his first visit. On his next visit he replaced a small part and my HIU was running perfectly. Both water and heating working great for a fraction of what other HIU service companies were quoting. I can't recommend enough these guys.

Very efficient HIU service.

Kat Young from Wanstead, East London – E11. ( 2nd of July )
Very impressed with how quickly we received a quote for a part and labour. It was much cheaper than I had quoted elsewhere and was very efficient too.

Quick response service.

Dov L. from Mill Hill, North West London – NW7. ( 28th of June )
Quick response, professional service, polite. will certainly use them again

We were really happy with their service.

Charlotte T. from Leyton, East London – E10 ( 24th of June )
We were really happy with their service and would definitely use again - Sigis was very prompt and efficient, and all at a really reasonable cost!

HUI MAINTENANCE Very good service.

William K. from Silvertown, East London – E16. ( 21st of June. )
HUI MAINTENANCE Very good service. Justin, the engineer who visited, was nice and professional. That day, he had to climb 8 floors with his equipment because the building’s lifts were out of order and didn’t complain! He asked a few questions about the status of my heating unit and went about his business while I was on a work call. Once I was free again, he explained to me in detail what he was doing. He answered my queries, most importantly got my radiators, which had stopped working this winter, up and running again and gave me a few tips with regards to general maintenance. And he acquitted himself without leaving a mess in my utility room. I’m very satisfied.

I would gladly recommend them.

Johan Harmse from Canning Town, East London – E16. ( 9th of June )
These guys did the annual service on my HIU unit, and delivered a really pleasant and professional service. I would gladly recommend them and will be using them again next year.

Very reasonable price and extremely pleased with the work done!

J Gordon from Canary Wharf, East London – E14. ( 2nd of June )
Excellent admin/organisation and the engineer was punctual, thorough and efficient. Very reasonable price and extremely pleased with the work done!

Highly recommend this firm.

James O, from Poplar East London – E14. ( 25th of May. )
Excellent service from the first point of contact. Very flexible when I wanted to change dates which they accommodated as I had a fairly urgent problem. The workmanship was excellent as was the follow up visit to fit the new parts needed to repair my HIU. The job was completed quickly with the minimum of fuss and no mess. Highly recommend this firm.

Danfoss HIU valve replacement.

Rollo C. from Dalston, North London – N1 ( 19th of May. )
Add Detail did a great job replacing 7 values on my HIU. Justin was helpful and super easy and straightforward to deal with. I would definitely recommend.

He also took the time to talk about HIU repairs versus replacement even outside office hours.

Bob C from Isle of Dogs East London – E14. ( 11th of May )
Wow!! Add Detail delivered exceptional service resulting in a very positive experience and total peace of mind. Highly professional, extremely competent and proactive. "Can do attitude" with a smile. My HIU had been leaking since Christmas and had not been serviced in many years. I was concerned that the HIU wasn't fixable and that a costly replacement HIU was the only option. Justin looked at the leak and fixed it without any fuss. He was also proactive and did extra work and checks to make sure the job was finished to a very high standard. He also took the time to talk about HIU repairs versus replacement even outside office hours. I will be recommending Add Detail to my Estate Management Company so other residents in my building can use them for HIU repairs/replacement/annual service.

Brilliant and efficient - would highly recommend!

Emma Marshall from Hammersmith, West London – W6. ( 4th of May. )
Brilliant and efficient - would highly recommend!

Really good on communications and offer competitive price.

Ichi from Bermondsey, South East London – SE16. ( 14th of April )
They were really good on communications, offer competitive price, have excellent technical skills and most importantly good people. They also went extra miles for me to accommodate my request and yes I am extremely satisfied. There are so many “bad job” delivered by some plumbers and engineers. They are not one of them, my neighbor also started using them as well! Thanks 🙂

Justin quickly identified the issue and fixed the HIU right away

Sylvia Wu from New Cross, South East London – SE14. ( 7th of April )
I chose Add Detail based on the positive reviews on Google and TrustPilot and it has been a fantastic experience. Thanks very much Sigis for sending an engineer literally 4 hours after booking. Justin quickly identified the issue and fixed the HIU right away + checked all the radiators in the flat. Very much appreciate the efficiency and professional service, just as suggested in other reviews 🙂 Would be more than happy to choose Add Detail again and recommend to friends. Wish you all the best.

My HIU heating system works perfectly now.

Osa Ayanru from Colindale, North West London – NW9. ( 27th of March )
Excellent service, punctual and efficient. My HIU heating system works perfectly now.

Reasonable rates too, especially as HIU's are complicated.

Charlotte Tome form Acton, West London. ( 8th of March )
The engineer was punctual, very polite and thorough, also very tidy and left everything as he found it. Reasonable rates too, especially as HIU's are complicated. Have also recommended to a neighbour and she was very happy with the work. Would definitely use again and recommend.

Add Detail responded quickly to my request for a well overdue service.

Gill Brown from Hornsey, North London. ( 26th of February )
Add Detail responded quickly to my request for a well overdue service. J came on time with mask and gloves. He respected distance from me at all times. Service took less than an hour . He had a few helpful tips. Cost for service was agreed beforehand. I'd use them again.

HIU maintenance

Kamila Ruiz Laszek from Colindale, North West London. ( 22nd of February )
Very professional, arrived on the dot, full COVID-19 safety, done HIU maintenance, very happy with the service

Really impressed with Add Detail - very professional and go out of their way to help as much as they can.

Anjella Balendra from Wandsworth, South West London. ( 16th of February )
I recently had Justin service my HIU and he did a fantastic job with identifying the problem. I then had a leak for a completely different reason. Justin found the issue and resolved it less than 24 hours after the leak had been found. Really impressed with Add Detail - very professional and go out of their way to help as much as they can. I will definitely be using them for all my heating/plumbing moving forward and would highly recommend them to anyone considering using their services!

Add Detail were friendly and efficient with the service of my HIU service.

Sian Jones from Colindale, North West London. ( 12th of February )
Add Detail were friendly and efficient with the service of my HIU service. I would highly recommend and will hire them again in future.

Very happy with the service, would use again and definitely recommend to friends and neighbours.

Peter Spence from Rotherhithe, South East London. ( 10th of February )
Justin provided a great service. He initially came to service my HIU but highlighted repairs needing done and also changed a valve. I have had problems with hot water for a while and he helped my get my hot water to the hottest it has been for ages. Very happy with the service, would use again and definitely recommend to friends and neighbours.

Great service, on time and very professional.

Simon Wheeldon from Streatham, South West London. ( 7th of February )
Great service, on time and very professional. Thank you to Justin for a great job servicing our HIU.

Excellent service. Honest guys. Would definitely recommend.

Manny Sandhu from Islington, North London. ( 2nd of February )
I called Add Detail after another HIU repair service told me that my unit needed to be replaced because parts were discontinued for my 8 year old unit. This would have cost nearly £4k. I called Justin at Add Detail for a second opinion. He was able to source the parts and fix the unit for a fraction of the cost. Excellent service. Honest guys. Would definitely recommend.

The service for my HIU was excellent

Erwin from Plaistow, East London. ( 15th of January )
The service for my HIU was excellent. My wife and I were very satisfied and the issue of our hot water in our bathroom and kitchen were rectified in a good manner. Definitely I am recommending our Add Detail Ltd to my friends and colleagues.

Ado Crespo
2023-06-02
Great service.
Kieran Wang
2023-05-15
Punctual, knowledgeable at a fair price. Recommend!
yang
2023-05-12
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
2023-04-09
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
2023-03-28
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
2023-03-16
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
2023-03-15
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.
M G
2023-03-11
They were very professional and came out the same day to sort out my heating system. Excellent service.
Daniel Dumbraveanu
2023-03-06
Very professional

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