How to Install Underfloor Heating?


This is a guest blog from Adam Brundell, an expert underfloor heating installer. Adam is the founder of Circa Installations & the Floor Heat Store with years of experience in installing underfloor heating.


Ask most people why they’ve chosen to install underfloor heating and you’ll find it’s because it is an energy efficient, safe and reliable heating system. In this blog post, I will share some of the top tips on how to install underfloor heating that I have learnt during the years as an underfloor heating installer. Whether you’re a professional installer or an enthusiastic DIYer, I hope you’ll find these tips useful.




Modern underfloor heating systems are divided into wet (or “hydronic”) and dry, or electric. Dry systems are generally simpler and they run on mains electricity, whereas wet systems use a loop of pipes carrying water and are connected to the boiler or another heat source. In terms of issues with installing underfloor heating, a competent DIYer shouldn’t have any major problems installing either system, though wet systems may be more complex.




Your choice of system is affected by where it’s going to go to. New build projects are well suited to wet systems as underfloor heating pipe is often embedded in new concrete floors, whereas the cables and mats that make up electric systems can be laid on top of the subfloor before being covered with whatever flooring has been chosen. With tiled floors, the cables will be sealed in tile adhesive. Wood and laminate flooring, vinyl and carpets can also be used with the system.




If you are not sure which type is best suited to your project, contact a qualified electrician or Warmup for advice on suitability of a chosen system and to discuss any remedial works which should take place before your installation commences. Warmup as the world’s best-selling floor heating brand is a great choice for the system. You should beware of cheaper alternatives made from low-quality products and always ensure that you are buying a genuine product from an authorised Warmup reseller to ensure the best value for money.




Clean the subfloor before installing underfloor heating pipe

Modern pipes used in wet systems are tough and durable. However, clean the subfloor thoroughly before installation and the laying of the underfloor heating pipes to get rid of any jagged edges that could damage them. You may need to lay a damp-proof membrane on the subfloor before installing the insulation layer that comes with the kit.

The pipe attaches to a simple set of units that hold it in position so that each loop is at the specified distance – generally between 200mm and 250mm apart, depending on the type of floor. The maximum length of pipe that can be used in any one room is about 100-110m.


Install the manifold first with wet underfloor heating systems

With wet systems, the manifold – the unit to which the pipe loop is connected in a particular room – should be the first thing that’s installed. You’ll need to account for the weight of the unit and for the pipes that are eventually connected when choosing a mounting site.

With electric underfloor heating, it’s necessary to get a qualified electrician at least to make the mains connection in order to comply with BS7671- 2008 and current IEE wiring regulations.


Be mindful of maximum temperatures and the final flooring

One of the most important things to consider is the kind of finished flooring that will be laid over the system as some floor covers have a top temperature restriction. Vinyl floors have a maximum temperature limit of 27°C degrees, as do carpet, laminate and wood floors.


Improve efficiency by insulation

I can’t emphasise enough how important installing Warmup insulation boards is. A lot of people try to save money and not bother with underfloor insulation, but it has massive benefits from decreased heat-up time to energy savings and lower running costs in the long term.


Plan and measure

Planning is essential so measure out the area and plan for the installation carefully. My tip is to take your time with this as it will make for a much quicker installation in the long run.

Make sure to consider all the fixtures and fittings that are going to be installed. For example, with a bathroom installation your toilet pans, pipe work for heated towel rails and radiators have to be fixed to the floor. All this needs to be taken into account when installing the system as to avoid damage to the heating wire when the above are being fitted. Also, ensure your existing subfloor is free from dust and dirt and, if it’s a wooden subfloor, check that there are no squeaky floorboards as fixing this afterwards will not be easy.


Test underfloor heating

It is very important that you test the system before and after all stages of the installation. If you are unsure, just ask your electrician to do this before the final floor covering goes down.

Also remember that all Warmup systems come with a SafetyNet™ Installation Guarantee which means that if the heater is damaged during installation, it will be replaced free of charge giving you that extra piece of mind when installing the system.




When laying underfloor heating mat, lay the mat with wires facing down to the subfloor and the mesh up this will give greater protection to the heating wire during installation. Always follow manufacturing guidelines or seek professional advice if in doubt.


And finally, if the final floor covering is going to be tiles or ceramic, I would always recommend using a flexible self-levelling latex or a flexible tile adhesive to cover the underfloor heating mat with a scratch coat as this helps the tile installation.

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DIY Tips

Want to add a personal touch to your home? Then get creative to add style that’s one of a kind to your home. Patchwork, knitting and crochet can all be used to add chic soft furnishings and accessories to your home, from cushions to throws and more. If you are new to crafting there’s lots of advice available online including helpful craft tutorials. Also take a make do and mend approach to upcycling existing pieces in your home with paint, decoupage or fabric.


Plumbing Tips

Reheat Solder When You Can’t Cut a Pipe

The best way to disconnect a soldered pipe is to cut it. But sometimes you can’t—either because you can’t get a cutting tool into the space or because cutting would leave the pipe too short to make a new connection. The solution is to heat the joint and pull off the fitting as the solder melts.

Have a wet rag handy and immediately wipe away the molten solder before it hardens. (Wear gloves to prevent burning your fingers!) Sometimes a quick wipe will leave the pipe ready for a new fitting. More likely, you’ll have to scour off some excess solder with sandpaper or emery cloth before you can slip on a new fitting.

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Electrical Tip

“Although at first glance lighting, sockets and off-peak heating in France may all appear familiar, closer investigation will reveal that the installation methods are different to those employed in the UK”

Excerpt From: Thomas Malcolm. “Electricity in your French house.” iBooks.


We are a new website, we are still growing our content, we want everyone that is renovating in France to help us feature what we all wanted to know when we all started, contact us with all your experience and tips, we live just south of Celles Sur Belle, in Deux Servre, 79, and are just about to start out on our next renovation, every job we start on, every problem, product or skill we need to learn about i will try and find some useful information on the internet and share it with you, yes I could do this by sharing it on facebook, but the problem is it just helps facebook and disappears down the timeline, here links and articles will be searchable and here permanently for you to book mark and refer to, so watch this space … and if you have links and articles that have helped you let us know !!1

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