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Keep Your Home or Business Warm from the Ground Up with Thermaze

Welcome to Thermaze! London, Essex, and Hertfordshire's premier underfloor heating system specialists. We're here to ensure your home or business stays warm, efficient, and comfortable—all from beneath your feet.

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Why Thermaze?

We all know how chilly the UK can get, so it’s no surprise that underfloor heating—whether it’s electric or water-based—is becoming a popular choice for keeping homes warm and comfortable.

At Thermaze, we specialise in both types of underfloor heating – electric and water based. Our systems can be installed in nearly any building, whether old or new, and they work just as well in small rooms as they do in larger ones. Instead of just heating the air, our systems warm the floor, creating even warmth throughout your space.

High-Quality Parts

We only use top-quality parts. Low-cost alternatives may seem appealing, but they often lead to inefficiencies or breakdowns. We don’t compromise on quality—your system is built to last.

Warranties You Can Trust

All our products come with industry-leading warranties. Materials are covered as follows: UFH Pipe—Lifetime Guarantee; UFH Manifold—10 years; thermostats and small parts—2–3 years depending on the model; and a 12-month workmanship warranty.

Fair Prices

Our prices are fair and competitive, and we never cut corners. Whether it’s for a business or a home, we promise to always provide excellent value for your investment.

Specialist Knowledge

We're underfloor heating specialists, not general plumbers. Our team handles the entire process, from design through to maintenance, ensuring the highest standards are met at every stage.

Free Quotes

We offer free, no-obligation quotes so that you can make an informed decision without any pressure. Our team will assess your space and provide a transparent estimate, ensuring no hidden costs later.

Easy Installation

Whether it’s a new build or a renovation, our systems are designed to fit seamlessly into any space. With our expertise, installation is straightforward, and we guarantee everything runs smoothly from start to finish.

Commitment to Solutions

Problems can occur with any system, but when they do, we don’t disappear. Our engineers stay until the job is done, and we're always on hand to help with repairs or upgrades.

Smart Thermostats for Full Control

We can upgrade your system with smart thermostats, giving you the ability to control your heating remotely via an app. This allows you to monitor and change the temperature from anywhere, ensuring your home or business is warm through those wintery chills.

About Thermaze

Here at Thermaze, we're a bit different from your average heating company. We've chosen to focus solely on underfloor heating in London, Essex, and Hertfordshire. Why? Because we believe in doing one thing, and doing it really well.

Our team of heating engineers, designers, and technicians have been working together for almost a decade, building a wealth of knowledge and experience. This specialisation means we know underfloor heating inside out. From design to installation, commissioning to maintenance, we handle it all.

We've seen too many underfloor heating systems that simply don't work as they should. Often, it's because they've been installed by general builders or plumbers who, while skilled in their own areas, might not fully grasp the nuances of underfloor heating. They might use off-the-shelf kits that don't take into account the unique qualities of your home or business. The result? Systems that underperform or, in worst-case scenarios, fail completely.

That's why we do things differently. We tailor each system to your specific needs, ensuring it works efficiently for years to come.

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Engineer writing notes
Underfloor heating system in modern living room
Technician installing heating pipes

Services by Underfloor Heating Specialists in London

We've built our reputation on being London's go-to specialists for underfloor heating. That’s because we're problem solvers, designers, and efficiency enthusiasts all rolled into one. We're true specialists in underfloor heating, and that's our competitive edge.

Underfloor heating isn't something you can estimate roughly and expect to work perfectly. Each system needs careful design based on your building's specific characteristics. That's where we thrive. Here's a rundown of what we do:

That's the gist of what we do at Thermaze. We're here to make sure your home is warm and comfortable, without you having to think about it too much. If you want to know more about any of these services, just ask. We're always happy to chat about keeping you toasty!

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Our 10-Step Underfloor Heating Process

We believe in keeping things transparent, so you know exactly what to expect at each stage. No surprises, just a clear path to warm floors. Here’s how we do it:

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Throughout this whole process, we're just a phone call away if you need us.

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Customer Testimonials

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Excellent on Google
5.0
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Sue Man6 May 2025
“Sergiu did an amazing job identifying the root cause of my underfloor heating not switching on despite a new thermostat being installed recently. His attention to detail, sharing of knowledge and kept me informed throughout the process of the work being carried are highly commendable. He successfully returned my electric flow to my underfloor heating after isolating the incompatibility of certain features of my new thermostat to my old one, quickly made some wiring upgrades and everything is perfect again. Job impeccably done. Excellent!”
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Tina Pristovsek24 March 2025
“I’d give 10 stars if I could. I highly recommend Thermaze. Second to none in terms of expertise and capability. Sergiu and Andrei were extremely efficient in getting the whole house UFH system repaired, relevant parts replaced, system recommissioned and also all thermostats upgraded (Wi-Fi enabled to control from an app) at request. All sorted in 48 hours and no mess. Don’t waste your time with anyone else!”
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O Kocademir12 March 2025
“Andrew was excellent; very professional & knowledgable. He fixed many issues including wiring with our UFH and brought the system back to life!”
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Vinay Raval15 February 2025
“After 7 years of frustration with my UFH system not working properly. Sergiu and team came to the rescue with a complete upgrade! Thermaze has a great work ethic they worked around the clock, 5 days in total from 9 till 9 one day, whilst making sure that we were comfortable and had sufficient heating throughout the work to period. Replaced and re-piped both 12 port manifolds flushed and treated the system and configured it to 6 x Honeywell Evo thermostats and communications tablet. The knowledge experience and skills displayed by Sergiu and team is the best I’ve seen for a long time. They are polite and did an extremely tidy job. I would highly recommend them they are literally masters in their field.”
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Damien Smith1 February 2025
“We used this company to service and repair our underfloor heating, we would thoroughly recommend them, they are completely clear in diagnosing problems in complex heating systems and clear in their quotes for repair. Realiable, punctual with and excellent with communication throughout the whole process.”
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Patrick Murphy30 December 2024
“Thermaze completel changed all the manifolds and fitted a new honeywell control system. For the first time since since we bought the house 6 years ago we have control of our underfloor polypipe heating system. Whilst they seem expensive the guys are very knowledgeable about this subject and their work is tidy and professionally completed. I wish I had come across them sooner it would have saved me a lot of money wasted on other so called experts, who failed miserably.”
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Lindsay Russell3 December 2024
“Had underfloor heating installed by Thermaze and they have been absolutely brilliant. Sergiu and his team have been so helpful during the installation. The installation and workmanship was tidy, neat and on time. Nothing was too much trouble. Would not hesitate to recommend them”
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pc 4u8 October 2024
“Our water underfloor heating system was not working correctly due to a leak that a previous engineer had failed to fix properly. We contacted the Thermaze team, who provided an estimate based on images and a couple of conversations. They reassured us that it was a simple fix for them —and they were absolutely right. This company is on top of their game. The engineer was a true professional, fixed the issue within the estimate, and even checked the radiators in the house. They kept everything super clean and kept me informed throughout the process. Thermaze is reliable, honest, clean, and truly professional. I highly recommend them for any underfloor heating issues. A++++”
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Sayeedul Ahmed30 August 2024
“Very professional and prompt service to commission and balance a new wet underfloor heating system. Highly knowledgeable and experienced with friendly service.”
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Henry Beverley13 March 2024
“THERMAZE sorted out my Underfloor Heating problem quickly and most professionally.”
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JEREMY LEWIS29 January 2024
“I have had great trouble finding wet-underfloor heating experts and, having unsuccessfully used a few others, am truly delighted to have met Thermaze. They came quickly to assess the problem. They then proposed a solution, returned and solved the issue and performed a full service, all completed on budget. Andrew the engineer was excellent and explained everything he was doing as he went along. I highly recommend Thermaze.”
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Adam Skinner16 November 2023
“I’m very pleased with my UFH service from Thermaze. They were very knowledgeable and informative about what needed to be done and did a great job in the agreed timeframe. Many thanks!”
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Rob Moore9 October 2023
“Highly professional, very knowledgeable and also helpful and friendly. Very impressed.”
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Bob SG31 May 2023
“Professional, in their job. Very tidy and polite. Leave site with 5/5 expectations . Recommend 100%”
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Neil Persaud31 May 2023
“Fast, knowledgeable & professional service, replaced 3 manifolds, switchers, removed all controllers, remediated wiring and installed hive. Will continue to use for annual servicing of underfloor heating system Highly recommended.”
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Krishna Udathu27 April 2023
“Sergiu is an expert and fixed my underfloor heating issues at lightening speed. I had a new underfloor heating system installed 6 months back never got the temperature about 22-23 degrees. So found Thermeze online and called though not sure what to expect. Sergiu not only identified the issue with wiring but also fixed it in an hour. Apart from his expertise I liked his attitude - explaining at every step what he was doing. To top it up he provided valuable advice on heating and also adjusted the flow rates. Now I can feel the underfloor heating finally working. I would definitely recommend Sergiu and his services.”
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Hongyi Han13 December 2022
“Sergiu and his team are very polite and professional. The engineer was able to quickly identify the source of my underfloor heating problem and fixed it in no time. They clearly knew what they were doing! Highly recommend them.”
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bob ski4 November 2022
“I instructed these guys to install my u underfloor heating guys. Absolutely fantastic. Professional, helpful reasonable priced. Very impressed and job was done so quick. Definitely recommend this company.”
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Jeremy Yapp2 November 2022
“Sergiu was really clear describing the problem (ufh system not functioning) and set out the options (and what they would cost) really clearly. The work was done promptly and successfully, I'd definitely use Thermaze again but I think it's all fixed now so I expect I won't have to!”
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jatin chohan5 October 2022
“Excellent service by Sergiu. Came out and inspected the UFH pipe work using his thermal scanner. Identified some cold spots but on inspection of the manifold, noticed the actuator valves were sticking and faulty. He ordered better brands and came back following day to fit. All working properly and finally got heat back into the areas that were cold. Definitely recommend”
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Denise Bevan5 February 2022
“This company is excellent and have just done a total repair of our underfloor heating which hasn’t worked properly for years! They were really knowledgeable, polite and efficient. It is working so beautifully and we are warm again! Thank you for a great job.”
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Ann-Marie Brennand13 January 2022
“We had underfloor heating installed throughout our whole house, Sergiu and his team were great and would highly recommend them. We really liked Sergiu's relaxed approach and was more than happy to answer all of our questions and any concerns we had.”
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John MacMillan16 March 2021
“Our heating system had broken and had never worked very well. Sergui came and fixed the system and then worked some magic so that it now works as we had always hoped it would. Great job!”
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Nikki Simpson22 February 2021
“Sergiu & his team installed an Ambiente Ambisolo heating system over 35sqm, along with a Hive Active Smart Heating system, and were brilliant from start to finish. They were recommended to me by Ambiente (the manufacturers of the system), and they came on board at a critical point during my renovation, after an underfloor heating system from another supplier had failed. It was not a straightforward job - the system had to be retrofitted over an existing concrete slab, and they also had to work with the first installation attempt, but they were completely unfazed by this. They completed their installation to a high standard, with real professionalism and attention to detail. Sergiu also took the time to follow up on progress a few weeks after the system had been commissioned - and in general communication was excellent throughout. I wish all the tradespeople I had worked with on my renovation had been as meticulous and professional as Sergiu and his team! I honestly thought companies like this were a thing of the past. I can't recommend them highly enough.”
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Nick C4 February 2021
“I recently had my underfloor heating system repaired that was not working. Sergiu is very competent and knowledgeable about underfloor heating. He identified and repaired the problem as promised.”
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Kazz Azim29 February 2020
“New UFH system had some issues, needed balancing. working great after Sergui at thermaze came and repaired it.”
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Vinit Joshi28 February 2020
“Very knowledgeable and professional. Went about investigating very logically and dealt with issues.”
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Sally Charter12 December 2019
“Sergiu from SG Underfloor Heating came to assess problems I was having with my underfloor thermostatic control. He explained what was going wrong with the system... and then fix it! He fitted five Nest smart termostats in a day and gave fabulous service: reliable, knowledgable, efficient and extremely skillful.”
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Michael Bell4 November 2019
“I found Sergiu online with a search for underfloor heating engineers. The people who installed the heating couldn't even set the programmers! Sergiu was very pleasant and professional. He tried to change the thermostat but no luck, so he checked the switch and found it faulty. He replaced this and set the controls in 2 rooms! Sergiu kept me informed at every stage and I thoroughly recommend him for any issues with underfloor heating! Excellent service. Thank you.”
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mark kupitz24 June 2019
“Sergiu and his team did a fantastic job installing a hot water underfloor heating system over 4 floors of a central London terrace house plus a separate electric cable system in an unconnected area of the house under extremely challenging conditions involving flooring installers and electricians working simultaneously -- with as many as 6 other people working in the same areas in my house as his team at times. From my initial conversation with him I could tell he knew his stuff and this was more than borne out by my experience when he came to do the work. He was pragmatic and creative in dealing with unexpected and not foreseeable issues that arose several times during the job when it became apparent that the existing heating, hot water and general plumbing systems in my 190-year-old house made no sense -- which is the most generous description although f-cked up is more accurate -- due to the myriad hodgepodge changes and repairs that had been carelessly made over the years, and he came up with cost effective solutions that he was able to achieve without adding to much extra time beyond his initial estimate. As a result, I ended up with a boiler/radiator/hot water supply system that is finally properly functional and efficient in addition to a state of the underfloor heating system with 7 separate zones for which I initially hired him. He was always courteous and helpful and had a great attitude and work ethic and worked well into the night most nights and on the weekends with my blessing in order to complete the job as quickly as he could. In short Sergiu more than exceeded my high expectations and I highly recommend him without any reservation or hesitation. I note that this is the first time I have been totally satisfied with the work done by any tradesperson in this country since I moved here from the United States almost 20 years ago -- and I have done 3 total house renovations and numerous other small and medium-size projects over those years, so I expect that I have had more dealings with building related tradespeople than most other people who aren't property developers.”
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Sal Pettah2 April 2019
“SG Underfloor Heating Good Informative Well Planned Punctual and good timekeeping Quality Products Used Professional workmanship Tidy Ultimate Finish On Time completion Reasonable Priced Provided all Paper works as this product has a long warranty that needs to transfer to next generation Certificate of warranty from the manufacturing company, Pressure Test Certificate, Commission Certificate, Plan121,with Photographs of work done I Highly Recommend Sergiu Grosu For this work which he has done Dated 27/03/201”
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Andrei Suiu9 January 2019
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Ready for Warm, Efficient Underfloor Heating?

We'd love to hear about your heating needs. Whether you're considering underfloor heating for a new build, thinking about retrofitting an existing property, or simply have questions, we're here to help.

Our team is ready to offer advice tailored to your specific situation. No obligation, just friendly, expert guidance.

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