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How to install underfloor heating systems

How to install underfloor heating systems

How to install underfloor heating systems

Electric underfloor heating mats offer a luxurious and efficient way to warm your home, providing comfort and even heat distribution. Installing these systems may seem like a daunting task, but with the right guidance, it can be a rewarding DIY project.

In this comprehensive guide, we'll take you through the step-by-step process how to install electric underfloor heating mats, ensuring a cozy atmosphere in your living space.


Planning and Preparation

Before diving into the installation process, thorough planning and preparation are essential to ensure a successful outcome.

Assess the Room

Start by evaluating the room where you plan to install the underfloor heating mats. Consider factors such as the room's size, insulation, and floor covering. Additionally, ensure that the subfloor is in good condition and level.

Choose the Right System

Selecting the appropriate electric underfloor heating system is crucial. Electric heating mats are a popular choice due to their ease of installation. Ensure that the chosen system is suitable for your flooring type and meets the heating requirements of the room.

Calculating the Correct Heater Size

Calculating the correct heater size is of the utmost importance as this system cannot be shortened.
How to calculate heater size:
1. Calculate room size: 8’ x 10’ = 80sqft
2. Subtract fixtures: Shower, bath, vanity, toilet (30sqft), 80sqft – 30 sqft = 50sqft floor area.
3. Subtract perimeter spacing, often calculated at 10% of floor area: 50sqft – 10% = 45sqft
4. Based on this you would need to order a 45sqft heater, in many cases you would round down to ensure that you don’t have excess heat.


Gather Tools and Materials

To streamline the installation process, gather all the necessary tools and materials beforehand.


  • Tape measure
  • Marker
  • Notched trowel
  • Multimeter
  • Megger tester
  • Insulation tape
  • Screwdriver
  • Sprit level


  • Electric underfloor heating mat or cable
  • Installation monitor
  • Thermostat and floor sensor
  • Insulation boards (if required)
  • Self-leveling compound


Installation Steps

Follow these step-by-step instructions to ensure a smooth installation process.

Prepare the Subfloor

  • Clean the subfloor thoroughly to remove any debris or dust.
  • If needed, install insulation boards to improve energy efficiency.
  • Use a spirit level to ensure the subfloor is level and even.

Lay Out the Heating Mats

  • Unroll the electric underfloor heating mats in the desired location, following the manufacturer's guidelines.
  • Avoid cutting or modifying the heating elements during installation.
  • Leave a gap of at least 3 inches between the mats and walls to prevent overheating.

Secure the Mats

  • Secure the mats to the subfloor by pressing the adhesive mesh firmly to the sub-floor.
  • In the case of mats being cut and flipped, use the double-sided tape as provided on the opposite side of the mat

Testing the Wiring

  • Use a multi-meter to check the resistance of the heating elements and ensure proper connectivity, refer to supplier guide for correct resistance.
  • Use a megger tester to ensure wiring insulation has not been compromised during installation.

Install the Thermostat

  • Mount the thermostat in a convenient location, away from direct sunlight or heat sources.
  • Connect the thermostat to the heating mats and sensor following the provided instructions.
  • Important: Do not energize system prior to covering with a levelling compound or tiles

Apply Self-Leveling Compound

  • Pour self-leveling compound over the heating mats, ensuring even coverage.
  • Use a trowel to spread the compound evenly and eliminate air pockets.


Final Steps and Tips


Test the System

  • Before laying the final flooring, test the underfloor heating system to ensure its functioning correctly – Do Not energize the system.
  • Tests must only be performed by using a Multi-meter and megger tester.
  • Address any issues or malfunctions before proceeding.

Lay the Final Flooring

  • Once satisfied with the system's performance, install the final flooring material over the heating mats.
  • Follow the flooring manufacturer's guidelines for installation.

Set the Thermostat

  • Program the thermostat to your desired temperature settings for optimal comfort and energy efficiency.
  • Monitor the system's performance regularly to ensure its continued operation.
  • Important: Do not energize system prior to covering with a levelling compound or tiles
  • Allow Thinset to properly cure and dry before energizing system, we recommend waiting at least a week.
How to install underfloor heating systems

The benefits of installing electric underfloor heating in your home

Electric underfloor heating mats offer numerous benefits that make them an increasingly popular choice for homeowners seeking comfort and energy efficiency.

  • Even Heat Distribution: One of the primary advantages of electric underfloor heating mats is their ability to provide even heat distribution across the entire floor surface. This eliminates cold spots and ensures a consistent and comfortable temperature throughout the room.
  • Energy Efficiency: Electric underfloor heating systems are known for their energy efficiency. They operate at lower temperatures compared to traditional radiators, resulting in reduced energy consumption and lower heating bills. The even heat distribution also allows for a quicker warm-up time, making it a more efficient way to heat a room.
  • Space Saving: Unlike bulky radiators or space-consuming heating systems, underfloor heating mats are installed beneath the floor, saving valuable wall and floor space. This provides homeowners with greater flexibility in room layout and design.
  • Silent Operation: Electric underfloor heating systems operate silently, without the noisy clicks or hums associated with traditional heating methods. This contributes to a peaceful and quiet living environment, especially beneficial in bedrooms or living areas.
  • Versatility in Flooring Options: Underfloor heating mats are compatible with a wide range of flooring materials, including tile, laminate, wood, and even carpet. This versatility allows homeowners to choose their preferred flooring without compromising the efficiency of the heating system.
  • Comfort and Luxury: Walking on a warm floor during chilly weather adds a touch of luxury to any home. Electric underfloor heating mats create a cozy and inviting atmosphere, making your living spaces more comfortable and enjoyable.


Final Thoughts

Installing electric underfloor heating mats is a rewarding project that can transform the comfort and ambiance of your living space. With careful planning, the right tools, and a step-by-step approach, you can enjoy the luxury of a warm floor during the colder months.

Whether you're a seasoned DIY enthusiast or a novice, following this comprehensive guide will help you achieve a successful and efficient underfloor heating system installation.

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