Heat Interface Unit (HIU) Installation London – HIU replacement 

Looking for a professional and reliable HIU installation service in London? Our experienced technicians are here to help with all your heat interface unit needs.

Our team of skilled engineers has extensive knowledge and experience in installing, servicing, and repairing heat interface units (HIUs). We are an approved installer of Redan-Danfoss SAV systems and have worked with numerous other brands. Our engineers ensure that your HIU is installed correctly and efficiently providing an energy efficient heating and hot water system

What is a Heat Interface Unit (HIU)?

Heat Interface Units are an essential component of communal or district heating systems. They provide individual control of heating and hot water to each property within a complex or block of flats making the entire system more efficient. Installing an HIU offers numerous benefits:

  • Energy efficiency: By enabling individual control of heating and hot water, HIUs can significantly reduce energy consumption and lower heating bills
  • Reduced maintenance costs: With fewer boilers and gas connections required, maintenance costs can be significantly reduced
  • Flexibility: HIUs can be connected to various energy sources including renewable energy making them an environmentally friendly choice
  • Space saving: Since HIUs do not require a separate gas connection or flue, they can be installed in a variety of locations within a property.

Reasons why you may need to replace your existing HIUs

There are several reasons why you might need to replace your existing HIU. There maybe scenarios  where replacing an existing HIU or upgrading to a newer model is the most cost effective option. 

When it comes to heating solutions in large residential or commercial complexes, heat interface units (HIUs) play a role in providing efficient and reliable hot water and central heating. However, like any other mechanical system, an HIU can experience breakdowns or inefficiencies over time. In such cases, replacing an existing HIU may be the best possible option compared to for example, continuously repairing or replacing parts on an older less efficient unit or one where replacement parts are difficult or expensive to source.

Frequent Breakdowns: 

If your HIU keeps breaking down despite regular maintenance and repairs it may be a sign that the unit is approaching the end of its service life. Repeated HIU breakdowns can lead to increased repair costs and disruptions to your heating and hot water supply. In such cases investing in a new HIU can save you time, money and frustration in the long run


Older HIUs might not be as energy efficient as newer models due to advancements in technology and design. Replacing your existing HIU with a more energy efficient unit can result in significant energy savings reducing your carbon footprint and lowering your utility bills. Newer HIUs may be fitted with more efficient heat exchangers or be better insulated and in this time of high energy prices, small energy efficiency improvements can make a massive difference in the annual energy bills

Compatibility Issues: 

If you are upgrading other components of your heating system, such as the central boiler or renewable energy sources your existing HIU might not be compatible with these new technologies. In this situation upgrading to a compatible HIU can help you take full advantage of the improved efficiency and performance offered by modern heating systems

Regulatory Compliance: 

Newer HIUs may offer better compliance with current building regulations and environmental standards. Replacing your old HIU with a unit that meets the latest building regulations can help you remain compliant and meet other regulatory requirements such as Minimum Energy Efficiency Standards (MEES) 

Improved Controls: 

Upgrading your HIU can also provide you with better control over your heating and hot water settings. Many modern HIUs come equipped with smart controls that allow for remote management, individual room temperature control and better scheduling options. These features can help you achieve greater comfort while further reducing energy consumption

Heat Interface Unit (HIU) Installation Process

Our experienced engineers will work closely with you to understand your specific needs and requirements. The installation process includes:

Site assessment: We will conduct a thorough site assessment to determine the best location and configuration for the HIU

Installation planning: Our team will create a detailed installation plan considering factors such as pipework, electrical connections and any necessary modifications to the existing heating system

HIU installation: Our skilled and qualified engineers will install the HIU according to the plan ensuring all connections and components are fitted correctly and securely

System testing: After installation we will test the system to ensure it is functioning efficiently and effectively

Customer support: We provide ongoing support, maintenance and periodic HIU servicing to ensure your HIU continues to operate at peak performance

Why Choose Pyramid Solution for HIU Installation?

  • Expertise: Our team of skilled engineers has extensive knowledge and experience in installing heat interface units.
  • Quality workmanship: We pride ourselves on our attention to detail and commitment to providing high-quality installation and customer service.
  • Competitive pricing: Our HIU installation services are competitively priced without compromising on quality
  • Customised solutions: We work closely with our clients to understand their specific needs and then consult with manufacturers to provide tailored HIU installation solutions
  • Ongoing support: We offer ongoing support and maintenance services to ensure your HIU continues to operate at peak performance
  • Workmanship guarantee: All our HIU installations are accompanied by a minimum of a two year workmanship guarantee 

What other HIU Installation related Services do you offer?

In addition to HIU installation, we provide a range of related services, including:

Smart Heating Controls: 

Improve energy efficiency and control your heating system remotely with intelligent thermostatic controls.

Heat Detectors:

Installation of wired, mains, and interlinked heat detectors for enhanced fire safety.

Smoke Alarms: 

Installation of mains wired and interlinked smoke alarms for homes, apartments, HMOs, and businesses.

Power Flushing: 

Deep cleaning of your central heating system to remove sludge and rust buildup and prevent damage to your boiler and radiators

Magnetic Filters:

Installation of devices that collect debris and rust from your heating system to prevent damage and improve efficiency

Boiler Servicing: 

Annual boiler servicing to maintain and extend the life of your boiler, as well as meet manufacturer requirements for warranty purposes

Boiler Installation: 

We install a variety of gas boiler types, including heat-only, system, and combi boilers, from major brands like Ideal, Baxi, Main, Vaillant, Keston, and more.

Plumbing and Heating: 

Comprehensive plumbing and heating repair, installation, and servicing.

Get in touch with Pyramid Solution today for all your HIU installation needs in London. Our experienced and dedicated team is ready to provide the best solution for your property. Contact us now for a consultation and a customised quote for your HIU installation project.

Frequently Asked Questions

How much does a London HIU installation cost?

The cost of HIU installation varies depending on the complexity of the project, the size of the unit, the brand, type of HIU and the labour and materials required. Please contact us for a customised quote based on your specific needs.

How long does it take to install an HIU?

The installation time for an HIU depends on the complexity of the project and any necessary modifications to the existing heating system. Our experienced engineers work efficiently to minimise disruption and complete the installation as quickly as possible. Typically a replacement HIU is installed in 1 working day

Can an HIU be installed in an existing building?

Yes. HIUs can be retrofitted in existing buildings but this needs to be designed by a system designer or the manufacturer of the HIU

What are the maintenance requirements for an HIU?

To ensure optimal performance and efficiency, regular maintenance and servicing of your HIU are essential. This includes annual servicing (bi-annual for certain brands), routine inspections and cleaning of internal components.

How do I know if an HIU is the right choice for my property?

If your property is part of a communal or district heating system, an HIU can provide an efficient and cost-effective solution for managing heating and hot water. 

Can I replace my existing HIU with another brand?

Yes. But this needs to be designed and specified by the manufacturer. We currently work with SAV systems and are able to offer a HIU modelled for any system and specified to meet your system needs. 

Will I need to make any modifications to my property for an HIU installation?

This depends on the existing infrastructure of your property. In some cases modifications may be needed to accommodate the HIU and its pipework.

Do I need to be present during the HIU installation?

While it is not necessary for you to be present throughout the entire installation, we do recommend that you are available at the beginning and end of the process to discuss any specific requirements and to review the completed work

What is the lifespan of a HIU?

With proper maintenance and care, a HIU can last for many years. The exact lifespan can vary depending on factors such as the make of the unit and the level of maintenance it receives but a HIU is expected to last 15-25 years.

How often will my HIU need to be serviced after installation?

We recommend having your HIU serviced at least once a year to ensure it is operating efficiently and effectively. Regular servicing can help to extend the lifespan of your HIU and prevent potential issues

Can a HIU be installed in a property without a central heating system?

A HIU is designed to be connected to a central or communal heating system. If your property does not have a central heating system a different solution may be required

What happens if my HIU breaks down after installation?

We offer ongoing support and maintenance services. If your HIU breaks down, our team of skilled engineers will be on hand to diagnose and repair the issue as quickly as possible

Can a HIU be linked to a renewable energy source?

Yes, heat interface units (HIUs) can be linked to renewable energy sources, heat pumps or solar thermal systems. This can significantly improve the energy efficiency of the heat network

How does a HIU linked to a renewable energy source improve energy efficiency?

A HIU linked to a renewable energy source can improve energy efficiency by harnessing renewable energy to provide heat and hot water to individual units. This can reduce the reliance on fossil fuels and reduce energy costs

Can an existing HIU be upgraded to connect to a renewable energy source?

This depends on the specific model and setup of the existing HIU. In some cases, an existing HIU may be compatible with a renewable energy source with minor modifications. In other cases, a new HIU may need to be installed

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