Underflor heating calculator

Published: November 1, 2024
Updated: November 7, 2024
201 visits
63 calculations
92 PDF downloads

Stay Warm with Ease – Underfloor Heating Calculation Simplified

Meet our Underfloor Heating Calculator — a quick and easy tool to help you find your perfect heating solution. Just enter your room dimensions and layout and get precise recommendations for thermostats, heating mats and more. The calculator takes into account fixed furniture, insulation levels and specific areas like bathrooms or walk-in showers to give you optimal warmth and energy efficiency. Click and get your custom plan and shopping list as a PDF to download.

Underfloor Heating Calculator output Options Explained

Mat Heating

Mat Heating

Underfloor heating mat is for wet areas or where new flooring is being laid. The mats are embedded in the tile adhesive or floor leveling compound so the heat is spread evenly across the floor. This is perfect for bathrooms, walk-in showers, and other high moisture areas. The mats have heating cables arranged in a pattern to distribute the heat evenly and reduce heat loss. The heating elements are pipe-free, so installation is simpler.

Take a look at our underfloor heating mats product.

Foil Heating

Underfloor heating foil is a thin heating solution that doesn’t add much height to the floor. It’s for floors that are already installed, like wooden panels where only a finishing layer will be added. This type of heating can be used under laminates and carpets so it’s a versatile option for existing floors. It’s perfect for areas where traditional heating pipes can’t be installed.

Check out our underfloor heating foil products.

Foil Heating
Thermostat Selection

Thermostat Options

Choosing the right thermostat is key to getting the most out of your underfloor heating system. The calculator will suggest the best thermostat for your room configuration, heating requirements, and preferences. Smart thermostats like the SUNFLOOR Smart WiFi Digital Thermostat give you advanced control and scheduling features to optimise heating and reduce energy consumption.

Explore our range of thermostats.

Excluded areas

To get the best performance and avoid energy waste, underfloor heating should not be placed under standalone elements like a bath, sink, or large fixed furniture. Excluding these areas will prevent overheating and make the heating system work more efficiently.

Thermostat Selection

Calculator Results

When you use our Underfloor Heating Calculator you’ll get a summary that includes:

  • Heating Area: The total area to be heated, automatically excluding any non-heated zones like spaces under fixed furniture or fixtures.

  • Product Recommendations: The recommended heating mats or foil for your room configuration and requirements.

  • Power Output: The total power required to heat the area effectively for warmth and comfort.

  • Thermostat Recommendations: Number and type of thermostats for precise and zone control across different rooms.

  • Cost: An estimate of the total cost based on your chosen products and room size to help you budget.

Our calculator will help you plan and gather all the materials you need for your underfloor heating installation to create a warm and energy-efficient space.

Benefits of Underfloor Heating

  • Quick and Flexible Installation: Our underfloor heating systems can fit any room shape and be installed under any floor type, offering design flexibility.

  • Smart Temperature Control: Advanced thermostats allow you to control the temperature precisely, even allowing a lower temperature when not in use to save energy.

  • Energy Efficient Heating: Underfloor heating runs at lower temperatures than traditional radiators, using less energy and delivering consistent warmth.

  • Space Saving: Free up wall and floor space by not needing radiators, giving you more flexibility to place fixed furniture.

  • Comfort Underfoot: Enjoy warm floors throughout your home, especially during winter.

Why Choose Our Underfloor Heating?

Our electric underfloor heating products warm both floors and rooms, offering a powerful solution for any project. Whether you’re installing heating mats for tiles or foil heating under wood, our systems are designed for easy installation and reliability.

What Is Electric Underfloor Heating?

Electric underfloor heating is an energy-efficient solution that evenly spreads warmth throughout your home or business, offering enhanced comfort and control. It operates without extensive renovations, making it ideal for new builds and upgrades.

Read our Underfloor Heating Guide for more insights and installation tips.

How Does Electric Underfloor Heating Work?

Electric underfloor heating operates with ultra-thin heating elements installed beneath your floor covering, providing consistent and comfortable room temperature. The thermostat allows you to set and control the desired temperature for efficient and reliable heating.


Underfloor heating calculator - FAQs


Can the heating mat be cut?

No, the mat must fit the heating area and be used in full. Cutting the heating cable will damage the system. Planning is key, so use the calculator to calculate the exact mat size needed.


Can the heating film be trimmed?

Yes, the heating film can be cut at designated points on the roll. But avoid placing it under fixed furniture to prevent overheating.


Where should I use heating film versus a heating mat?

Heating film is best for dry installations under wood or laminate flooring. Heating mats are for embedding in screed for tiled or stone floors.


Can the power and sensor cables be shortened or extended?

Yes, both cables can be shortened or extended, providing flexibility during installation.


What is the maximum load for a thermostat?

The maximum load for a single thermostat is up to 3500W, suitable for around 23m². For larger areas, consider zoning or using a relay switch.


Can one thermostat support multiple floor sensors?

No, one thermostat can control only one floor sensor. This allows for precise control in each area.


Do I need a thermostat for the heating mat?

A thermostat is recommended for temperature control, energy savings, and preventing wear and tear.


Can mats from multiple rooms be controlled by a single thermostat?

Without additional components, no. Consult an electrician for solutions.


Can I connect multiple mats to a single thermostat?

Yes, as long as the total power doesn’t exceed 3500W.


How do I enter room dimensions?

Enter full room dimensions, and specify areas to exclude, like under fixed furniture. The heating area will be calculated with a 5% reduction for safety.


What areas should I exclude?

Exclude fixtures and heavy furniture that sit on legs less than 10cm high to prevent energy loss.


What thermostat options?

Thermostat quantity is calculated to match heating power. Options include digital thermostats with app control.


Can I use one thermostat for a large heating area?

Yes, with a suitable relay switch. Proper load calculation is key.


What are the common mat sizes and configurations?

Configurations vary based on room layout. Smaller rooms may use compact mats under 10m², while larger spaces may require up to 20m² mats.

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