Professional HIU Repairs & Servicing Across London
If your Heating Interface Unit (HIU) is underperforming, leaking, or due for a service, we’re here to help. Our London-based engineers specialise in HIU repair, servicing, and optimisation for homes, landlords and managed properties. We offer fixed-price callouts, fast response times, and expert diagnostics to keep your system running safely and efficiently. No long waits. No hidden costs. Just reliable HIU support when you need it.
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What We Can Help With
Specialist HIU Services for Homes, Landlords & Property Managers
HIU Repairs
From pressure issues to faulty valves, our engineers quickly diagnose and repair all common HIU faults using high-quality parts and expert care.
HIU Servicing
Extend the life of your HIU and keep it running efficiently with regular servicing. We work around your schedule to minimise disruption.
HIU Replacement & Upgrades
Time for an upgrade? We install new, energy-efficient HIUs that meet modern performance standards and reduce long-term costs.
What OUR CLIENTS THINK
Testimonials
Friendly and professional, with great service and very efficient! Would absolutely have these guys back in the future if needed! :)
Incredible company, thank you for assisting with the emergency works at the school
Why Choose Snowik for HIU Services in London
With over 20 years of industry experience, Snowik is a trusted name for HIU servicing, repair and replacement across London. Our engineers are Heating Interface Unit specialists – fully qualified, Gas Safe registered, and committed to delivering fast, efficient support with clear, fixed pricing. Whether you're managing a residential block or need help in your own home, we make HIU problems stress-free to solve.
HIU Specialists, Not Just Plumbers
We focus on Heating Interface Units – giving you expert insight, accurate diagnostics, and repairs that last. No guesswork, just proven solutions.
Gas Safe &
Certified Engineers
Our team is Gas Safe registered and trained to work safely on both communal and individual HIU systems – ensuring full compliance and peace of mind.
Transparent
Fixed Pricing
We don’t believe in surprises. You’ll receive a clear, fixed quote before any work begins, so you always know where you stand.
Trusted by Property Managers & Landlords
We’re the go-to HIU partner for landlords, managing agents, and housing providers across London. Reliable, responsive, and always professional.
Our SENIOR team
At the core of our HIU service is a senior team with decades of hands-on experience in heating systems and interface units. From complex diagnostics to large-scale property support, our leadership ensures every job is completed with precision, professionalism and the high standards Snowik is known for.
Simon
Managing Director
Simon leads with 20+ years of industry knowledge, driving standards, service, and trusted results.
Maria
Operations Director
Maria oversees daily operations, ensuring smooth service delivery, scheduling, and communication.
Pawel
Technical advisor
Pawel offers expert trade guidance, helping our team deliver safe, compliant and quality solutions.
Ben
Partnerships manager
Ben builds trusted client links, supporting clients with a responsive, reliable service.
Frequently Asked Questions
Got a question about our HIU servicing or repairs in London? Here are answers to some of the most common queries we receive. If you can’t find what you need, just get in touch — we’re happy to help.
What is a HIU service?
A HIU service involves inspecting, cleaning, and testing the unit to ensure it runs efficiently and safely. Regular servicing helps prevent breakdowns and keeps heating and hot water flowing reliably.
How often should a HIU be serviced?
We recommend servicing your HIU once a year. Regular maintenance extends the unit's lifespan, improves performance, and ensures early detection of potential faults.
What are the signs my HIU needs servicing?
Common signs include low water pressure, inconsistent heating, no hot water, unusual noises, or leaks. If you notice any of these, it’s time to book a service.
What does a HIU service include?
A standard service includes safety checks, cleaning filters, inspecting components, testing flow rates, checking pressure levels, and ensuring the unit operates correctly.
How long does a HIU service take?
A typical HIU service takes between 60–90 minutes, depending on the condition of the unit and whether any repairs or part replacements are needed.
Do I need to turn anything off before my HIU is serviced?
No preparation is usually required. Our engineers will take care of everything upon arrival and will advise if any temporary shutdown is needed during the service.
Can you repair my HIU if there’s a fault during the service?
Yes. If we identify a fault during the service, we’ll explain the issue and provide a clear quote for the repair. With your approval, we’ll aim to fix it during the same visit.
Are your HIU engineers qualified?
Yes, all our engineers are fully trained, certified, and experienced in working with a wide range of HIU systems in residential and commercial settings.
Is there a call-out fee?
We’re transparent about all costs. A call-out fee may apply depending on the service or repair required, but this will always be clearly explained before any work begins.
Can landlords or property managers book bulk HIU servicing?
Absolutely. We regularly work with property managers across London to provide scheduled HIU servicing for entire buildings or portfolios at competitive rates.
Is a HIU gas or electric?
A HIU itself doesn’t use gas or electricity directly for heating; it transfers heat from a central plant or district system to an individual property using heat exchangers. The system supplying the HIU may be gas-powered.
How long does a HIU last?
With regular servicing and proper maintenance, a HIU can last between 10–15 years. Some systems may last longer depending on usage and system design.
How much does a HIU cost to install or replace?
Installation or replacement costs vary depending on the system type and complexity. We provide clear, no-obligation quotes based on your specific setup and needs.
What’s the difference between a HIU and a boiler?
A boiler generates heat within a property, while a HIU draws heat from a central system and transfers it into your home for heating and hot water—ideal for flats with district heating.
Can you service any brand of HIU?
Yes. Our engineers are experienced with all major HIU brands and models, including Evinox, Danfoss, Altecnic, and more.
HIU Service Coverage Areas
View Our HIU Service Areas
- Battersea
- Belgravia
- Chelsea
- Clapham
- Earl's Court
- Fulham
- Hammersmith
- Kensington
- Lambeth
- Mayfair
- Paddington
- Wandsworth
- Westminster
