Can You Use Carpet with Underfloor Heating?
Carpet and Underfloor Heating
If you’re wondering, “Can I use carpet with underfloor heating?” the short answer is yes, absolutely. Carpet and underfloor heating work well together, but you do need to pick the right type of carpet and underlay.
More and more people are installing underfloor heating these days, especially with heat pumps becoming more popular. And naturally, this creates questions like:
- Will the carpet block the heat?
- Does it make underfloor heating pointless?
- Is carpet or hard flooring actually better? And
- Can you put rugs on top of underfloor heating?
So let’s look at all these points and break them down in simple terms.
What Is Underfloor Heating?
First off, underfloor heating warms up your room from the ground up instead of using radiators stuck to the wall. There are two main types: wet systems, which use warm water running through pipes under the floor (very common in new builds). The water-based heating systems can be powered by Gas/Oil boilers or what’s becoming increasingly popular are air source or ground source heat pumps.
The other system is electric underfloor heating, which use heating cables or mats, this is more commonly used in bathrooms or a single room here and there.
What Is a Heat Pump Underfloor Heating System?
Now, if you’ve got a heat pump running your underfloor heating, it works a bit differently from a regular boiler. Heat pumps produce lower temperatures but run for longer stretches. They work best when your house is well insulated. That’s why your floor covering matters even more with a heat pump than with an old-school boiler.
Can You Put Carpet Over Underfloor Heating?
Yes, you can. But here’s the trick: you need to pay attention to something called “thermal resistance”, also known as the R Value, or in the UK, the rating more commonly used is the “TOG rating.” These values basically tell you how well carpet and underlay let heat through.
What Is an R Value or Tog Rating?
If you’ve searched “best carpet TOG for underfloor heating” or “best R-Value for carpets and underfloor heating”, here’s what it means.
A high TOG or R-Value means the carpet will insulate more, so your feet feel warm, but a higher value will also block some of the heat from your underfloor heating. A low TOG or R-value means heat passes through easily.
For underfloor heating, the combined tog of your carpet and underlay should be 1.5 or less, but we would always recommend double-checking with your heating installer to be sure.
If you need to convert a tog rating to a thermal resistance value, which comes up in commercial flooring specifications, it’s simple: 1 tog equals 0.1 m²·K/W. So, your total value should be 0.15 m²·K/W or less.
Carpet and Underfloor Heating
Myth vs Fact
“Carpet blocks all the heat.” Not true. If you choose the right carpet and underlay, heat passes through just fine.
“You can only use tiles or hard flooring.”
Not true. Sure, hard floors let heat through a bit quicker, but the right carpet works perfectly well.
“Heat pumps don’t work with carpet.”
They certainly do! You just need to stick with a low-TOG or low R-Value carpet and underlay, since heat pumps run cooler.
“The carpet will overheat or get damaged.”
Modern carpets are tested for this. As long as your system is properly installed and you stick to the recommended temperature (usually up to 27°C at floor level), carpet is totally fine.
Is Carpet or Hard Flooring Better for Underfloor Heating?
This is a big question.
Hard flooring transfers heat a bit faster, but can feel chilly when the system’s off, tends to create a noisier environment and is harder underfoot.
Carpet feels warmer, gives you extra comfort, and helps reduce noise. In modern, well-insulated homes, especially with heat pumps, the difference in efficiency between a suitable carpet and hard flooring isn’t all that big in day-to-day life.
And realistically, comfort within your home really matters. Underfloor heating already gives you a steady, cozy warmth. Adding carpet just makes your home feel even better.
What to Look for When Choosing Carpet for Underfloor Heating
If you’re shopping for carpet for underfloor heating, here’s what to do:
- Check the TOG rating or thermal resistance value; the combined carpet and underlay value should be 1.5 TOG/ 0.15 m²K/W or less.
- Pick the right underlay. This makes a big difference. Look for underlays that are labelled as “underfloor heating compatible,” have a low TOG rating, and are made from materials designed for good heat transfer (like specialist PU foam or certain rubber underlays).
- Think About Pile Type. Shorter, denser carpet piles usually transfer heat better than those deep, plush ones. But honestly, a lot of modern twist and loop carpets still do the job just fine.
- Check what the Manufacturer Says before you commit, double-check with both your carpet supplier and your heating installer. You want to know for sure that your choices play well together.
That’s it. With the right choices, you get warm floors and all the comfort of carpet, no compromise necessary.
What About Rugs with Underfloor Heating?
For those who prefer a combination of hard flooring and rugs, they ask: “Can I use rugs with underfloor heating?”
The answer’s yes, but steer clear of really thick, heavy rugs and anything with a rubber back. Those tend to trap heat. A rug here or there won’t hurt, just don’t cover the whole floor with something thick, or you’ll make the system work harder in that spot. With good modern systems, this hardly ever causes real problems.
Why Carpet Can Actually Work Well with Heat Pumps
Heat pumps run at lower temps for longer. Carpet actually helps here. It slows heat loss, keeps warmth steady, feels soft and warm under your feet, and just makes bedrooms and living rooms comfier. In bedrooms, especially, a lot of people actually prefer carpet as it feels cosy and doesn’t mess with the system’s performance.
Energy Efficiency: The Real Picture
People get this wrong all the time. Carpet doesn’t block heat transfer; it just softens it a bit. In a well-insulated home, the difference in heat-up time between tile and a low-tog/R Value carpet is pretty small. What really affects your running costs is how well the house is insulated and how the system’s designed, not what’s on the floor. If your system’s set up right, carpet won’t suddenly make it inefficient.
So, Should You Use Carpet with Underfloor Heating?
If you want softer floors, less noise, comfort underfoot, a warmer feel, or just a cosier space, carpet really can work with underfloor heating. Just keep a few things in mind:
- Don’t go over the recommended tog rating or R-Value
- Use an underlay that’s made for underfloor heating
- Double-check with your installer
- Pick a trusted manufacturer
Carpet and underfloor heating aren’t enemies; when you choose carefully, they actually work really well together. If you’re planning a renovation or a new build with a heat pump, talk to your flooring supplier and heating installer early on. A bit of planning means you get the comfort of carpet without losing out on performance.
