How to Install Electric Underfloor Heating Under Vinyl and LVT

This guide shows you how to fit the EkoBuild AHT amorphous ribbon system under vinyl and LVT. The mats are 1.8mm thin, run at 150W per m², and need no screed or self-leveller. You keep your floor height and skip the messiest part of a traditional UFH job. The system is fitted in over 100 UK homes and carries a 15-year warranty, honoured directly by the UK importer.

One rule before anything else. Planning and laying the mats is DIY-friendly. The final electrical connection is not. A qualified electrician must connect the system to the mains, in line with Part P and BS 7671. Build that into your plan and budget from the start.

Tools and materials checklist

• AHT ribbon heating mats, 0.5m or 1m wide, sized to your room plan
• Therm-All insulation, £53.50 per 10m² pack
• WiFi touchscreen thermostat, £89.99
• Tape measure, pencil and paper, or the room designer tool
• Sharp knife for cutting insulation to size
• Strong tape for insulation joints and securing mats
• Multimeter for resistance and continuity testing
• Vacuum cleaner for subfloor prep
• Thin dry overlay boards if you are fitting sheet vinyl (from your flooring supplier)
• A qualified electrician for the final connection

Planning and Measuring Your Room

Start with the flooring, not the heating. Check that your vinyl or LVT is rated for use over underfloor heating. Nearly every manufacturer states this on the product datasheet, along with a maximum floor temperature. If you have not bought the flooring yet, pick a product that clearly allows it. Unsure? Call us on 07883 298944 and we will check with you.

Next, measure the room and sketch it on paper. Mark everything fixed: kitchen units, islands, built-in wardrobes, the bath, the shower tray. You never lay heating under fixed units, so what remains is your heated area.

The ribbon comes in two widths. 0.5m wide mats cost £45 per m² and come in lengths from 1m to 7m, which suits most rooms and awkward shapes. 1m wide mats cost £65 per m² in lengths up to 3.5m and cover open areas in fewer runs. Most rooms use a mix.

One number matters more than the rest. If this will be your main heat source, the ribbon must cover at least 70% of the floor. That is the minimum for the system to work as primary heating. For comfort warmth on top of other heating, cover what you can.

The room designer does the layout for you. Draw the room, mark the units, and it returns the exact mats to order with a price.

What You Need

The shopping list is short and there are no wet trades. You need heating mats to match your plan, Therm-All insulation so the heat goes up into the room rather than down into the subfloor, and the WiFi touchscreen thermostat. Like any electric UFH thermostat, it works with a floor probe that reads the floor temperature, and fitting the probe is covered in the steps below. Add everyday tools and a multimeter for testing. Fitting a bathroom? The Bathroom Complete Kit is £299. The full list is below.

Step-by-Step: Installing Underfloor Heating Under Vinyl

Here is the full sequence. Take your time on steps 5 and 6. Everything after that covers the ribbon up, so get it right before it disappears.

1. Check your flooring suits underfloor heating. Confirm with the vinyl or LVT manufacturer that the product is rated for UFH, and note the maximum floor surface temperature on the datasheet. Keep that number for the thermostat setup later.
2. Plan and measure the room. Sketch the room, mark every fixed unit, and measure the open floor. Use the room designer to turn your measurements into an exact ribbon layout and price.
3. Prepare the subfloor. It must be clean, dry, flat and solid. Vacuum thoroughly, fix loose boards, and sort any damp before you go further. Heating mats will not cure a bad subfloor, and vinyl shows every flaw.
4. Lay the insulation. Cover the heated area with Therm-All insulation and tape the joints. Without insulation, a share of your heat sinks into the subfloor instead of warming the room.
5. Roll out the heating mats. Position the 1.8mm ribbon mats on the insulation to match your plan. Keep them clear of walls and fixed units, lay them flat with no overlaps, and never cut or shorten the heating element itself.
6. Test before you cover anything. Check each mat's resistance and continuity with a multimeter, record the readings, and photograph the whole layout. If a reading looks wrong, stop and call us on 07883 298944.
7. Fit the floor probe and route the cables. Place the probe between two ribbon runs, then route it and the mat cables back to the thermostat position on the wall. Leave everything disconnected.
8. Fit the overlay or lay the flooring. Sheet vinyl needs a thin dry overlay board over the mats first. Click LVT can usually go straight over the ribbon if its manufacturer allows it. More on both below.
9. Connection and first heat-up. A qualified electrician makes the final connection to the mains, in line with Part P and BS 7671, and commissions the WiFi thermostat. Then bring the floor up to temperature gradually over the first few days, following your flooring manufacturer's guidance.

Sheet Vinyl, Click LVT and Glue-Down LVT: What Changes

Vinyl comes in three main forms and each behaves a little differently over heating.

Sheet vinyl. It is flexible and shows every ridge and edge beneath it. Standard practice is to fit a thin, rigid dry overlay board over the mats before the vinyl goes down. That gives the fitter a smooth surface and protects the ribbon. It is a dry board, not screed or self-leveller, so there is no wet trade and no drying time. Your flooring supplier can recommend an overlay that suits the vinyl.

Click LVT. Rigid click planks are the easiest match for the ribbon. They usually lay directly over the mats as a floating floor. Check the LVT maker's fitting guide for underfloor heating: some allow the planks straight over, some specify a thin underlay. If an underlay is used, keep it thin with a low tog rating so the heat passes through. The same general rule applies to any covering above the ribbon: the lower its thermal resistance, the better the heat transfer.

Glue-down LVT. Treat it like sheet vinyl: overlay board first, then the LVT. The adhesive must be rated for use over underfloor heating, which the tub or datasheet will state.

Temperature limits. Most vinyl and LVT manufacturers set a maximum floor surface temperature, commonly around 27°C. This is their guidance, so follow the figure on your product's datasheet. Set that figure as the cap on the WiFi thermostat and the floor probe holds the floor at it, so the limit is enforced automatically day to day.

Common Mistakes to Avoid

Avoid these and your install will go smoothly.

• Laying ribbon under fixed units. Heat trapped under a kitchen unit or bath does nothing for the room. Plan around them.
• Skipping insulation. Without it, part of your heat warms the subfloor instead of your toes. One pack covers 10m² for £53.50 and earns its keep every day.
• Covering the mats before testing. Test, record the readings, take photos. Finding a fault under a finished floor is a miserable job that ten minutes with a multimeter would have caught.
• Cutting the heating element. The 0.5m wide mats come in lengths from 1m to 7m and the 1m wide mats from 1m to 3.5m, so order sizes that fit your plan. The element itself must never be cut or shortened.
• Thick underlay over the ribbon. Anything with a high tog rating above the heating blocks the warmth. Keep whatever sits over the ribbon thin and heat-friendly, per your flooring maker's UFH guidance.
• Under-covering when it is your main heating. Below 70% floor coverage the system cannot do the job of primary heating. Check your percentage before you order.
• Connecting it yourself. The mains connection is a job for a qualified electrician under Part P and BS 7671. No exceptions.

What It Costs: A Real 12m² Kitchen Example

Take a 3m x 4m kitchen, 12m² in total, with fitted units along one wall covering 3m². That leaves 9m² of open floor to heat.

• 9m² of 0.5m wide ribbon at £45 per m²: £405
• WiFi touchscreen thermostat: £89.99
• One pack of Therm-All insulation (covers 10m²): £53.50

Total: £548.49, with free UK delivery because the order is over £150.

Coverage check: 9m² of a 12m² room is 75%, which clears the 70% minimum for primary heating. This kitchen could run on the ribbon alone.

Add your electrician's fee for the final connection. It is a small job and prices vary by area, so get a quote up front. Doing a bathroom instead? The Bathroom Complete Kit is £299.

Plan Your Room in Minutes

The fastest way to price your own room is the room designer. Draw the room, mark the fixed units, and it returns the exact ribbon layout and cost. Then order everything from the shop, with free UK delivery on orders over £150.

Want to read more first? Start with the full electric underfloor heating guide, or see why no screed matters for floor height. And if you would rather talk it through, call the AHT amorphous ribbon specialists on 07883 298944. EkoBuild is based in Flint, North Wales, and every mat carries a 15-year warranty honoured directly by the UK importer.

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