Heat Interface Unit Maintenance and Repair in Lambeth & South London

Heat Interface Unit services to keep your family and you warm and comfortable. We are based in Lambeth and cover South London.
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Sean Apap Mangion
22 February 2026
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Have used them twice now, once to disconnect/relocate radiators and another time to relocate the boiler. In both cases the team managing things have been very professional, quick but thorough, and clear re what was to be done. Particular thanks to James, Ronan, and Nick. Prices are fair for good quality work and service, will definitely reach out again for any other jobs.
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Nicholas Wells Antiques
19 February 2026
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Very happy with Aren Heating & Plumbing servicing our wet underfloor heating. Excellent
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Adam Williams profile picture
Adam Williams
13 February 2026
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The team at Aren are consistently professional, responsive, polite and well priced.
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Daniel Otto Kellett
5 February 2026
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An excellent UFH service, good value, quick appointment and gave me some really useful advice. I’ll definitely be using them again. Thanks !!
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Nikolas Holttum
28 January 2026
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Aren were terrific. They really knew their stuff. They carried out a thorough diagnosis of our boiler problems and eventually recommended a replacement. All the team were punctual and super professional. Highly recommended.
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Courntey bailey
23 January 2026
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We have been using Aren Properly Services since 2022, and always receive amazing care when doing our boiler services, or any remedial works. They always go above and beyond and never try to rip you off like a lot of contractors out there. Highly recommend
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Timur Sanerkin
21 January 2026
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First class service
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Emily C profile picture
Emily C
21 January 2026
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Quick and professional service. Fixed my heating and clearly explained the problem and fix.
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Thomas Goode
13 January 2026
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I had an issue with my HIU. I was able to quickly arrange a booking with Aren. Their onsite engineer was polite, friendly and punctual. He fixed the problem quickly and gave me some basic advice on what to look out for to help troubleshoot future problems. I would highly recommend Aren Heating and Plumbing.
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Duncan K
12 January 2026
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Quick, clean and efficient. Very pleased and will be using Aren again. Ronan (the plumber) worked hard and fast to finish job inside 1 hour which kept the cost down for me, when he could have easily relaxed and stretched it out. Thanks!

Get it fixed:

Heat Interface Units (HIUs) act as an interface between a central heating system and individual dwellings within a building. They are typically installed in multi-occupancy buildings such as apartment complexes, office blocks, or housing developments. HIUs facilitate the distribution of heating and hot water generated centrally to individual living spaces, offering greater control and efficiency.

Our fully qualified and trusted engineers can repair and service your Heat Interface Unit safely and efficiently.

Head over to our Heat Interface Unit Repair, or Heat Interface Unit Service page for more information about the heat interface unit repairs and services we can offer you.

We are Aren Heating & Plumbing. The go-to choice when it comes to keeping your family and you comfortable.

Functionality and Primary Components of a Heat Interface Unit

A Heat Interface Unit consists of various components that work together to deliver heating and hot water services. Below is a shortlist of primary components, and functionality, that our engineers can service and repair.

Heat exchanger: The heat exchanger within the HIU transfers heat from the central heating system to the individual dwelling’s heating circuit. It ensures efficient heat transfer and minimises energy losses.

Water valves: HIUs incorporate valves that control the flow and temperature of water circulating within the unit. These valves regulate the supply of hot water and heating according to the user’s requirements.

Temperature sensors: Temperature sensors measure the temperature of the water entering and leaving the HIU. This data helps maintain the desired temperature levels and ensures optimal performance.

Controls and interface: HIUs are equipped with user-friendly controls and interfaces, allowing occupants to adjust heating and hot water settings according to their preferences. This enhances convenience and ensures personalised comfort.

Sounds complicated? It is, but not for Aren Heating & Plumbing. We are here to make sure you live in warmth and comfort without complication.

If you need a service or repair for your Heat Interface Unit please head to our Contact page and fill out the online form. Alternatively, if you are in the heat of the moment, you can call or WhatsApp us directly on 020 8287 7194.

Key information

Heat Interface Unit Controls
Heat Interface Unit Pumps, Sensors, and components
Heat Interface Unit Repairs
Heat Interface Unit Servicing
Plus More...

Gas & Landlord Safety Certificates

Estate agents and landlords regularly request our services for gas safety certificates and survey reports.

We provide a fast, professional and safe service so you can get your certificates and reports arranged with minimum fuss.

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Brands we work with

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Areas we cover

We cover these South London boroughs