Rugs With Underfloor Heating: What You Need to Know

Underfloor heating and rugs are perfectly compatible, provided you choose with heat in mind. Heated floors are now common in kitchen extensions, new-build flats and renovated period homes, and they are lovely to live with. But a heated floor works by warming the room from below, and anything you lay on top slows that heat down. Choose a thick, heavily insulating rug and you can end up with cold rooms, hot spots and a heating system working harder than it should. This guide explains how rugs affect heating, what the tog rating means, which constructions and backings are best, and how to place a rug on underfloor heating sensibly.

How rugs affect underfloor heating

Underfloor heating, whether a wet system with pipes or an electric mat, warms the floor surface, which then radiates heat into the room. A rug acts as a layer of insulation between that warm surface and you. The thicker and denser the rug, the more heat it holds back.

That does not mean you have to live with bare floors. It means choosing rugs that let warmth through: flatter, lighter constructions rather than deep, dense piles, with backings that tolerate gentle, constant warmth.

Understanding tog: the key rug underfloor heating number

Tog is a measure of thermal resistance, the same unit used for duvets. The higher the tog, the more a material insulates. Heating manufacturers usually set a maximum tog for everything laid on the floor combined, including carpet, underlay and rugs. A figure of around 2.5 tog is often quoted, but limits vary, so check your system's manual or ask your installer.

Not every rug comes with a tog rating, so use construction as your guide. Flatweaves and slim, flat rugs insulate far less than thick shag or heavy, dense pile.

Choosing rugs on heated floors: construction and backing

• Go flat. Flatweave rugs and printed rugs on a woven backing are the safest choice for rugs on heated floors.
• Avoid very thick pile. Deep shaggy rugs trap the most heat.
• Check the backing. Woven fabric backings, such as cotton, are generally better suited than heavy rubber or latex backings, which can trap heat and may react with some floor finishes.
• Think about the fibre. Our rug fibre guide covers how different materials behave.

Underlay, placement and the thermostat

1. Choose the right underlay. If you need a non-slip layer, pick a thin one sold as suitable for underfloor heating, and include it in your tog total.
2. Leave floor exposed. A rug that covers only part of the room, such as the seating zone, lets the rest of the floor heat the space freely.
3. Find the floor sensor. If your system uses a floor probe, a rug over it can make the system think the room is warmer than it is and switch off too early.
4. Keep furniture in mind. Avoid covering large heated areas with both a rug and a solid-based sofa or bed, which compounds the insulation.

Kitchens, extensions and other heated rooms

The rooms most likely to have underfloor heating are also the rooms most likely to see spills: kitchen-diners, garden-room extensions and bathrooms. That makes thin, machine washable rugs a natural fit. A runner along the kitchen units or a rug under the dining table adds colour and comfort without blocking the heat for the whole room. See our kitchen rugs for ideas.

Our rug picks

Antique Lattice Dusty Blue & Ivory Vintage Washable RugMade to order · 10 sizes · machine washableFrom£50Star Reserve Ivory & Taupe Vintage Washable RugMade to order · 10 sizes · machine washableFrom£50Window Check Ivory & Cocoa Washable RugMade to order · 10 sizes · machine washableFrom£50Grey & Red Heriz Medallion Washable RugLondon stock · ready to shipFrom£39

Antique Lattice Dusty Blue & Ivory Vintage Washable Rug

Dusty blue and ivory in an antique-look lattice. Printed polyester chenille on a woven cotton backing, rather than a deep pile, it suits a heated kitchen-diner and goes in the machine at 30°C. Made to order in 10 sizes from £50.

Star Reserve Ivory & Taupe Vintage Washable Rug

Ivory and taupe stars in a vintage-style geometric, soft and neutral for a heated open-plan living space. Try a runner size along the kitchen units.

Window Check Ivory & Cocoa Washable Rug

An ivory and cocoa window-pane check with a modern, Scandinavian feel. It works under a dining table in a heated extension, framing the zone while leaving the rest of the floor clear.

Grey & Red Heriz Medallion Washable Rug

A traditional Heriz-style medallion in grey, red and blue. It is a washable flatweave in chenille polyester with a cotton woven backing, about 4 mm, from £39, and ships from our Enfield warehouse within 1–2 business days.

Frequently asked questions

Can you put a rug on underfloor heating?

Yes. Choose a flat, low-insulation rug, check your system's maximum tog, and avoid covering the whole floor.

What tog rug is suitable for underfloor heating?

Add up the rug and any underlay and keep the total within your system's limit; around 2.5 tog is commonly quoted. Flatweaves and slim rugs are the easiest way to stay under it.

Can a rug damage underfloor heating?

A very thick rug can cause heat to build up underneath, and some rubber backings may react with floor finishes. Thin rugs with woven backings avoid most problems.

The best rug for a heated floor is slim, flat and sensibly placed. Get those three right and you keep both the warmth and the comfort. Explore our machine washable rugs for easy-care options.