Warm floors are easy to imagine. Working out which heating system, flooring and controls you need can take a little more thought.
Whether you’re renovating one room or planning a larger project, these FAQs cover the practical questions to ask before buying.
Why choose underfloor heating?
Underfloor heating might seem like a luxury, but it can be a practical way to add another layer of comfort to your space. With the heating tucked beneath your flooring, it can also free up wall space where it replaces radiators.
Whether you’re renovating one room or planning a larger project, there are different systems to consider. The right choice depends on your flooring, insulation and whether you want warm floors or heating for the whole room.
At Toasty, we stock electric underfloor heating, which uses heating cables or mats beneath the floor finish.
Can electric underfloor heating be installed in an existing home?
Yes. Electric underfloor heating can be incorporated into an existing home, particularly when you’re already replacing the flooring.
Heating mats sit beneath the floor finish, so the project will usually involve lifting the existing flooring and preparing the subfloor. The amount of work depends on the room and its existing construction.
Slim heating mats can help limit the additional floor height, but the mat isn’t the complete build-up. Insulation boards, adhesive or levelling compound and the new flooring all need to be included.
Before buying, ask your installer to check the finished floor height and any effect on doors, thresholds and adjoining rooms.
What’s the difference between electric and water-based underfloor heating?
Electric underfloor heating uses heating cables beneath the flooring, often pre-spaced on a mesh mat. These generate heat directly and are controlled by a thermostat.
Water-based underfloor heating circulates warm water through pipes connected to a compatible heating source, such as a boiler or heat pump.
Their installation requirements and running costs differ. Electric systems can be practical for individual room renovations, while water-based systems are often considered as part of larger heating projects.
Which electric underfloor heating options does Toasty offer?
Our range includes Toasty’s own-brand heating mats and controls, alongside Heat Mat systems and accessories.
The Toasty Electric Underfloor Heating Mat delivers 160W/m², with pre-spaced cable attached to a flexible mesh. It’s designed for floor warming and can provide sole-source heating in suitable, well-insulated spaces.
Our Heat Mat options include different outputs, up to 200W/m², as well as heating cables for use in compatible installations.
Higher output isn’t automatically better. Your installer should recommend a system based on the room’s heat loss, available heated floor area and chosen floor finish.
Which flooring can be used with electric underfloor heating?
Tile and stone transfer heat well and are suitable for many electric UFH installations. Other finishes, including certain wood, laminate, vinyl and carpets, can also work - but compatibility depends on the specific heating system and flooring.
Both Toasty’s 160W/m² mat and Heat Mat’s standard 160W/m² mats can be used beneath suitable wood and laminate finishes with the specified minimum 12mm layer of flexible levelling compound.
Heat Mat’s 200W/m² mats must not be used beneath wood, laminate, LVT, vinyl or carpet.
Always check:
- Whether the flooring is approved for the chosen electric UFH system
- The required installation layers, adhesives and underlay
- The flooring manufacturer’s maximum temperature
- Any limits on thermal resistance, including carpet and underlay together
A thermostat with floor-temperature limitation helps control the system, but it doesn’t make an unsuitable floor covering compatible.
Can electric underfloor heating heat the whole room?
It can, provided the system can meet the room’s heating requirements.
That depends on more than the mat’s wattage. Insulation, heat loss, floor-temperature limits and the amount of floor available for heating all matter.
A room with plenty of clear floor space may have different requirements from one with extensive fitted furniture, even if their total dimensions are the same.
If you want UFH to provide all the room’s heating, have your installer assess heat loss before choosing a system. If your aim is warm flooring, it can work alongside existing radiators or heated towel rails.
How do I choose the right mat size?
Choose a mat to suit the usable heated floor area, rather than the room’s total floor area.
Your installer should plan around fixed fixtures and any areas excluded by the manufacturer’s instructions, allowing the specified clearances.
Don’t buy an oversized mat expecting to trim the heating cable. On a suitable cut-and-turn system, the mesh can be cut to change the mat’s direction; the heating cable itself must not be cut.
Confirm the layout and required coverage before ordering
Do I need a thermostat?
Yes. Electric underfloor heating needs compatible controls to regulate its operation and manage floor temperature where required.
Toasty offers programmable and WiFi thermostat controllers compatible with its heating mat. Heat Mat also offers controls for its systems.
A programmable controller lets you schedule heating around your routine. WiFi models can offer remote control, depending on the product.
Check the controller’s compatibility, electrical load capacity and sensor requirements before buying. Don’t assume a UFH thermostat can also control radiators, heated mirrors or other appliances unless the product specifically supports that setup.
How much does electric underfloor heating cost to install?
The total depends on the heated area, chosen system and work needed to prepare and finish the floor.
Budget for more than the heating mat. Your project may also require:
- A compatible thermostat and floor sensor
- Suitable insulation boards
- Adhesive or flexible levelling compound
- Floor preparation and fitting
- Electrical connection and testing
- Replacement flooring
Ask for a complete installation quote so you can compare the finished project cost rather than product prices alone.
What affects its running costs?
Running costs depend on the installed wattage, how long the system actively heats and your electricity tariff. Insulation, temperature settings and the room’s heat loss also affect usage.
Electric UFH can be costly when heating large areas or running for long periods. It shouldn’t automatically be presented as a cheaper alternative to gas central heating or a heat pump.
Programmable controls help you schedule warmth for when you need it. Suitable insulation beneath the system can also help reduce downward heat loss.
Before choosing, consider whether you want occasional floor warming or regular whole-room heating, and ask for an estimate based on your proposed setup.
Can I install electric underfloor heating myself?
Heating mats can make laying out the system more straightforward, but the installation still needs careful planning, preparation and testing.
Follow the manufacturer’s instructions throughout, including requirements for cable protection, sensor positioning, electrical tests and curing times before switching on.
A qualified electrician must complete the connection to the electrical supply and confirm the required circuit protection.
Agree who is responsible for each stage before work begins, and retain the installation and test records required by the guarantee.
What should I check before buying?
Start with three questions: what do you want the heating to do, which flooring will sit above it, and how much usable floor area can be heated?
Your installer can then help confirm a suitable output, floor build-up and compatible controls.
Explore our electric underfloor heating range, including Toasty heating mats and thermostat controllers, to find the right setup for your project.
