Heat Interface Unit Repairs London

Warmth, Restored Fast

Fully Accredited

Gas Safe Registered

350+ 5 Stars

Google Reviews

9.67/10 Rated

200+ Checkatrade Reviews

Local Experts

10+ Years Experience

Fully Qualified

Gas Safe

350+ 5 Stars

Google Reviews

9.67/10 Rated

200+ Checkatrade Reviews

Local Experts

10+ Years Experience

Benefits

Benefits of an Air Source Heat Pump

When a heat interface unit fails, it usually means no heating or hot water at all, which is particularly disruptive in flats and shared developments. A prompt, properly diagnosed repair gets things working again fast and reduces the risk of the fault affecting the wider communal heating system or coming back again soon after.

What Our Customers Say

Read what some of our customers have to say about the excellent work we do.

    
 
 
       Posted on Google  
   
   Andrei A 
 
 
 
 Trustindex verifies that the original source of the review is Google. Amir and his team did a great job replacing my boiler, and identified and fixed some other key safety issues with our gas flues that had not been picked up in previous gas safety inspections. Very good communication, transparent pricing and high quality work - would definitely recommend them!
  
 
      Posted on Google  
   
   Carmen Martinez 
 
 
 
 Trustindex verifies that the original source of the review is Google. Amir and Hamed made a fantastic job in my flat. I needed to replace my old vented water cylinder by a new unvented one. The espace was quite tight and I also wanted to accommodate the washing machine in the same area. They managed to fit everything! Really happy with the result and the communication. Totally recommended. Really well done job and on time.
  
 
      Posted on Google  
   
   dave pasola 
 
 
 
 Trustindex verifies that the original source of the review is Google. We have used H3GS to install a new boiler and also an upgrade on the gas pipe run.

On both occasions they have delivered a great service within cost and time.

They work hard, tidily and very respectfully of the customer and their needs. I have no hesitation in recommending them to anyone who needs heating work done.  They are also very trustworthy and can be left alone in a house.
  
 
      Posted on Google  
   
   Toby 
 
 
 
 Trustindex verifies that the original source of the review is Google. H3GS have completed a few different jobs for us over the past couple of years, including sealing our heating system, servicing our boiler and replacing a motorised valve that was letting through.

I can highly recommend H3GS. Amir is really friendly, professional, responsive and reliable. All of the work has been clearly explained and costed beforehand, and carried out on time and within the agreed budget. Thanks very much !!
  
 
      Posted on Google  
   
   althea McCourt 
 
 
 
 Trustindex verifies that the original source of the review is Google. We appreciated H3GS’s prompt response to our urgent pipe leak. Amir quickly identified and diagnosed the problem, and the team carried out the repairs efficiently and professionally. They were also very considerate of our elderly mother who was at home during the work. We would be happy to recommend H3GS to others.
  
 
      Posted on Google  
   
   Iulian Gelepu 
 
 
 
 Trustindex verifies that the original source of the review is Google. Very quick, efficient and professional.
  
 
      Posted on Google  
   
   Aziz Abdul-Malik 
 
 
 
 Trustindex verifies that the original source of the review is Google. I have used H3GS a few times now.

For the first time, I had an emergency and they were quick to review the pictures and videos I sent them to determine what the likely issue was. I was fortunate that they were able to do the repair on the same day.

I had another issue with my boiler due to a leak and they were quick to advise me about the possible issues with the boiler as well as the danger that the boiler was in due to it breaking through the floor. They were able to fix the problem within a few days as it wasn't a straightforward fix.

Every time I have used them, there has always been a preliminary assessment via pictures and videos, which has helped them analyse the issue in the first instance to reduce the delay on an onsite analysis. This has meant that they have arrived at the job prepared.

Amir's communication is always polite and concise and I have always received a prospective quote for the job once an onsite analysis of the problem has been done.

I highly recommend them and will continue to use them for any future plumbing problems that I have.
  
 
      Posted on Google  
   
   Felicia Samuel 
 
 
 
 Trustindex verifies that the original source of the review is Google. Absolutely amazing company! We have been using them since they installed our boiler. They service our boiler annually and we have NEVER had any problems. If you want an efficient, friendly and professional service this company is the one to choose 👌🏾
  
 
      Posted on Google  
   
   Birju Prajapati 
 
 
 
 Trustindex verifies that the original source of the review is Google. Excellent comms, clear pricing, efficient work. Will definitely be using them again. Thanks guys
  
 
      Posted on Google  
   
   Leopold Oakes 
 
 
 
 Trustindex verifies that the original source of the review is Google. Fast and professional service. Will use again in the future.

H3GS Heating & Cooling

Our Repair Process

Once you let us know what’s happening, we’ll arrange a suitable time for an engineer to attend. They’ll check the key components, such as the heat exchanger, sensors and valves, to find the actual source of the problem, then explain clearly what’s needed before any work starts. Once repaired, we test the unit fully to confirm your heating and hot water are properly restored.

Why Choose Us?

Why Choose H3GS Heating & Cooling?

Familiar With Flats and Developments

We understand the specific setup of communal heating systems and the coordination they often involve.

Easy to Work With for Landlords and Agents

We’re used to liaising directly with managing agents and landlords, not just the resident.

We Move Quickly on Loss of Heat or Hot Water

We know these faults are urgent, particularly for tenants, and treat them that way.

Fully Qualified Engineers

All repairs are carried out to a proper, compliant standard.

Get Your Heating Back On

A flat without heating or hot water isn’t something to sit with. Contact H3GS Heating & Cooling & Cooling today for a fast, professional repair.

FAQs

What exactly is a heat interface unit?

It’s the device that transfers heat and hot water from a shared, central heat source into individual flats, commonly found in newer developments and blocks with communal heating.

Why has my hot water stopped but the heating still works, or vice versa?

This usually points to a specific component fault, such as an issue with the plate heat exchanger or a sensor, rather than a total system failure. Our engineer can confirm exactly what’s affected once on site.

I'm a landlord, can you liaise directly with my managing agent?

Yes, we regularly coordinate access and updates directly with managing agents, so you don’t need to be the one chasing everything.

How quickly can someone come out if a tenant has no heating?

We treat loss of heating or hot water as urgent and try to get an engineer out as soon as we reasonably can.

Will the repair affect other flats in the building?

In most cases the fault sits within your individual unit, and repairs won’t affect neighbouring properties, though we’ll flag it if that’s not the case.

Is the work guaranteed?

Yes, our repairs are guaranteed, so if the fault returns shortly after, get in touch and we’ll come back to resolve it.