• What is a HIU?

    A Heat Interface Unit (HIU) is an essential part of the efficient delivery of heating and hot water to consumers on district and communal heating schemes.

    The HIU provides safe connection of the consumer’s space heating and hot water systems to the primary heat supply network together with control functions and metering.

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    Do I need to service my HIU?

    Servicing a HIU is paramount to its longevity. In fact it is recommended to do so on an annual basis by all manufacturers. Doing so is vital in maintaining your HIUs highest possible temperatures for both heating and hot water as over time filters and valves get blocked up. This results in poor flow rates which leads to insufficient heat transfer and in turn to low temperatures at the outlets.

  • What's included in a HIU service?

    During a service we will test your units primary flow rate, T1, T2 and delta T to make sure you aren’t paying any extra on your energy bills for any unused kWh which can be caused by faulty valves letting by.

    We will service your HIU along with all its mechanical valves and electronic heads. We will recalibrate thermostatic valves and actuator heads.

    Heating and hot water will be tested along with the central heating system being balanced. A service certificate will be provided on completion.

Our Services

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    HIU Service

    Save money and get your annual HIU service from just £60 with our Group Booking Deals.

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    HIU Repair

    Any parts supplied by us, along with all work undertaken by us is guaranteed for 12 months.

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    HIU Install

    All units installed by us come with a 5 year warranty with the first years service being free.

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    District Heating

    Our commercial gas team will assist you with all your District Heating needs.

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HIU Maintenance Plan

For a fee of just £24.99 a month.

Our HIU Maintenance Plan allows you to relax and let us take care of any problems you may experience with your HIU.

12 Month Plan | T&Cs

  • By joining our maintenance plan you eliminate the stress of finding an engineer when you have a breakdown.

    We will send a fully qualified and well experienced HIU engineer to you free of charge between the hours of 08:00 and 18:00 Monday to Friday.

  • We will service your HIU free of charge.

  • If you’re experiencing any issues with your Heat Interface Unit we will not charge you for any repairs between the hours of 08:00 and 18:00 Monday to Friday.

  • Free dose of Fernox F1 Central Heating Protector.

  • You’ll qualify for priority booking of appointments and reminders prior to the date of your scheduled HIU service.

‘Your Comfort Is Our Priority!’

Our mission is to provide the residents of Greater London, Essex & Kent with a no hassle service where all work exceeds expectations, meets deadline and offers excellent valve for money. We work very closely with our clients to ensure complete customer satisfaction.

London’s Leading HIU & District Heating Specialists

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About Us:

We are a company comprised of HIU and Commercial Gas engineers that specialise in Heat Interface Units and District Heating.

All of our HIU engineers are fully qualified and have been trained directly by SAV Systems, Altecnic Caleffi and Switch2 including many other manufactures.

As a company we are confident that we can meet all your requirements and also exceed your expectations when it comes to quality and affordable engineers.

We pride ourselves on offering a hassle free and affordable service where the customer needs always take priority, as do excellent quality workmanship and operating to modern standards.

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What Our Clients Say

  • Capital HIUs installed a new HIU for us after the existing unit broke down and was beyond economical repair, the engineer whom attended was very knowledgeable and professional they explained all the features of the new unit and upgraded our control to a smart nest controller so we can control our heating before we get home.

    James Bustin

  • Used Capital HIU to replace a broken meter, James was very polite and professional. We had some initial problems with the installation, due to our boiler being quite old, but James found a solution. As well as doing an outstanding job, Capital HIU was by far the best value I could find locally.

    Joel McKinley

  • After calling several HIU contractors Capital HIU Engineers were the only ones to answer and able to accommodate an appointment for me the very next day!

    Nicola Ellis

  • The engineer was very professional, knew what he was doing, answered my questions, and worked without doing a mess.

    Nora Pashayan

  • "The engineer Adam was professional and courteous at all times and answered all my questions. Administration was also excellent as well as pricing (compared with other HIU servicing companies used in the past) Would wholeheartedly recommend."

    Stephen G

  • James came to service our HIU, he was great very thorough. Spoke to him in the morning and luckily he had a cancellation and did the service by 10:30. Great service ! Thank you

    Tani Naidoo

  • "Booked a service before winter sets in and Allan was amazing, its clear he is very knowledgeable in he's line of work. Not only did he do a great job he also answered all of my questions thoroughly and talked me through not only how my HIU works but also district heating networks that supply it. I would highly recommended these guys! :)"

    Vanessa Jackson

  • "I have used Capital HIU a few times now and they have been the most consistent and professional HIU specialists that I have found in London. They try to complete repairs in a cost effective manner. Recommended"

    Constanza Guillen

  • "Perfect - next day service, incredibly quick, so much better than other HIU companies in the area."

    Arthur Kolayan

  • "I used Capital HIU Engineers to service an HIU in my apartment. James was professional and quick to respond to emails. Report arrived on the day of the visit. Highly recommended."

    Barbora Sladkova

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