Underfloor heating is one of the most comfortable upgrades a UK home can have — and one of the most frequently ruined by the wrong rug. A thick pile rug over a UFH system is like putting a duvet over a radiator: it blocks the heat, strains the boiler, and leaves the room no warmer than before. But the opposite assumption — that you can't use a rug with underfloor heating at all — is equally wrong, and equally common.
The truth is straightforward: the right rug works perfectly with underfloor heating. The wrong rug works against it. This guide covers exactly which materials and construction types are compatible with UFH, what the TOG rating system means in practice, and the specific Haniesta pieces that perform best in heated rooms across the UK.
In this guide
Section 01
How underfloor heating and rugs interact
Underfloor heating works by warming the floor surface, which then radiates heat upward into the room. The process is more efficient and more comfortable than radiator-based heating, but it is sensitive to anything that insulates the floor — slowing the heat transfer before it reaches the room.
A rug on top of an UFH system acts as an insulating layer. The thicker and denser the rug, the more it insulates, and the harder the system has to work to push heat through. This is not a reason to avoid rugs — it is a reason to choose the right rug. A kilim flatweave with zero pile adds negligible thermal resistance. A thick hand-knotted wool Gabbeh adds considerably more. The difference is measurable, and choosing wisely means you get both the warmth of UFH and the character of a handmade rug.
Section 02
Understanding TOG ratings — the only number that matters
TOG stands for Thermal Overall Grade — a measure of a material's thermal resistance (how effectively it insulates against heat transfer). The higher the TOG, the more the material insulates. For duvets, you want high TOG in winter. For rugs over underfloor heating, you want low TOG — so the heat can pass through the rug into the room efficiently.
Most UFH manufacturers recommend a combined TOG of no more than 1.5 TOG for the total floor covering (rug + underlay combined). Many specify 1.0 TOG or below. As a practical rule: keep the rug itself under 0.5–1.0 TOG, and use a UFH-compatible underlay rated at 0.5 TOG or lower.
Note that TOG values for rugs are not always published by retailers. A reliable proxy is pile height and construction type: zero-pile flatweave is always low TOG; thick hand-knotted pile is always higher TOG. When in doubt, contact the manufacturer or ask Haniesta directly.
Section 03
Material verdicts — what works, what to avoid
Here is an honest assessment of every rug material type against underfloor heating performance.
Kilim & cotton flatweave — the best UFH rug
Kilim and cotton flatweave rugs are the outright best choice for rooms with underfloor heating. Zero pile means zero thermal resistance beyond the fibre itself, and natural fibres (wool-cotton blend, cotton, flatweave wool) are poor insulators at flatweave thickness. The heat from your UFH system passes through a kilim virtually unimpeded — meaning you get the full benefit of the system and the full character of a handmade rug without any engineering compromise.
The geometric boldness of kilim pattern is also particularly well-suited to the room types where UFH is most commonly installed — open-plan living areas, contemporary dining rooms, and hallways with stone or tiled floors. The flat surface of a kilim also means it won't impede sliding doors or create trip hazards in rooms where furniture movement is frequent.
- Zero pile = minimal thermal resistance — heat passes freely into the room
- Fully reversible — flip every six months to even wear and heat exposure
- Works on stone, porcelain tile, and engineered wood UFH floors
- Easy to clean — no pile to trap debris or restrict airflow around fibres
- Compatible with both hydronic (water-based) and electric UFH systems
Natural jute — excellent thermal performance
Natural jute is an excellent UFH companion. Its open-weave construction — individual plant fibres woven with visible gaps between — allows both heat and airflow to pass through more freely than any pile construction. Jute's natural thermal conductivity is low, meaning the fibre itself doesn't absorb and hold heat that should be reaching the room. The result is a rug that performs well thermally while also delivering the warm, earthy aesthetic that works especially well in rooms with warm stone or tile UFH floors.
One important caveat with jute and UFH: avoid jute in rooms where the UFH raises the ambient humidity, as jute is sensitive to persistent moisture. In well-ventilated rooms with dry UFH floors, there is no issue. In bathrooms or rooms with humidity concerns, use kilim instead.
- Open weave structure allows heat to pass through naturally
- Earthy natural tone complements warm stone and tile UFH floors beautifully
- Sustainable — the most eco-conscious UFH rug choice available
- Excellent as a base layer over UFH — top a large jute with a smaller kilim
- Keep dry — avoid in rooms with humidity concerns
Low-pile wool & wool-cotton blend — use with a UFH underlay
Low-pile wool and wool-cotton blend rugs — where the pile height is under approximately 8mm — are acceptable over most UFH systems when used with a thin, UFH-rated underlay rated at 0.5 TOG or below. The combined TOG of a low-pile wool rug and a suitable underlay typically falls within the 1.0–1.5 TOG range that most system manufacturers accept.
What matters most is pile depth. A Haniesta Monoluxe wool rug with a measured pile height under 8mm sits in a very different thermal category from a thick Gabbeh — despite both being wool. If you love the warmth and character of wool but have UFH, choose a low-pile wool piece and pair it with a specialist UFH underlay. Do not use a standard foam underlay — it will push the combined TOG above the safe threshold.
- Acceptable on most UFH systems when pile depth is under ~8mm
- Always use a UFH-rated underlay rated at 0.5 TOG or lower
- Check combined TOG (rug + underlay) against your system's manufacturer spec
- Avoid standard foam underlays — they are not UFH compatible
- Electric UFH systems are more sensitive than hydronic — check with your installer
Thick pile Gabbeh & deep-pile wool — not suitable for UFH
Thick pile Gabbeh wool rugs — with pile heights of 10–18mm — have a combined TOG that exceeds most UFH manufacturers' recommended maximums. Placing a Gabbeh over an UFH system is not dangerous, but it is inefficient: the system will run longer and harder to achieve the target room temperature, increasing energy consumption and wear on the pump or element.
This is not a permanent verdict against Gabbeh rugs — it is a placement consideration. A Gabbeh is one of the most beautiful and enduring rugs available. It simply belongs in a room where it doesn't compete with your heating system. Place it in a room with radiators, or in a room with no heating source where its insulating properties work in your favour, keeping the warmth you've created in the space rather than preventing it from arriving.
- Not recommended as a permanent covering over UFH — too high a TOG rating
- Safe to use in rooms with radiators — pile insulation is an advantage, not a problem
- Can be placed temporarily over UFH in summer when the system is off
- The beauty and longevity of a Gabbeh are undiminished — it's a placement issue, not a quality issue
Section 04
Full UFH compatibility comparison
| Rug type | Pile height | Approx. TOG | UFH verdict | Underlay needed? | Best UFH rooms |
|---|---|---|---|---|---|
| Kilim / cotton flatweave | 0 mm | ≤ 0.5 | ✅ Ideal | Optional thin non-slip | Living room, dining, hallway |
| Natural jute (handwoven) | 0–2 mm | ≤ 0.5 | ✅ Ideal | Optional thin non-slip | Living room, study, hallway |
| Cotton dhurrie (flatweave) | 0–2 mm | ≤ 0.5 | ✅ Ideal | Optional thin non-slip | Any room with UFH |
| Bohemian braided jute | 2–4 mm | ≤ 0.8 | ✅ Good | Optional thin non-slip | Living room, bedroom |
| Low-pile wool (≤ 8mm) | 4–8 mm | 0.8–1.2 | ⚠️ Use UFH underlay | UFH-rated ≤ 0.5 TOG required | Living room, bedroom |
| Wool-cotton blend (low pile) | 4–8 mm | 0.8–1.2 | ⚠️ Use UFH underlay | UFH-rated ≤ 0.5 TOG required | Living room, bedroom |
| Thick pile wool Gabbeh | 10–18 mm | > 1.5 | ✗ Not recommended | — | Rooms with radiators |
Section 05
Haniesta's top picks for underfloor heating rooms
Three confirmed UFH-compatible picks from the Haniesta collection — chosen for thermal performance, room suitability, and handmade character.
UFH-compatible, handcrafted, built to last
Browse the full Haniesta collection — flatweave and natural fibre rugs for heated floors
Shop kilim & flatweave →Section 06
5 rules for using rugs over underfloor heating
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Keep combined TOG at or below 1.5
Add the TOG of the rug and the underlay together — the total must stay within your UFH system manufacturer's maximum. Most systems specify 1.5 TOG as the upper limit. Many specify 1.0. When in doubt, stay under 1.0.
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Never use standard foam underlay over UFH
Standard foam underlays — including the kind sold with laminate flooring — have TOG ratings of 1.5–2.5 on their own. Combined with even a thin rug, they will push the total well beyond any UFH system's safe threshold. Use a specialist UFH-rated underlay (available from most flooring retailers) rated at 0.5 TOG or below.
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Choose flatweave or low-pile as your primary UFH rug
Construction type is the most reliable indicator of UFH compatibility. Zero-pile flatweave (kilim, dhurrie, jute) is always safe. Low-pile wool under 8mm is acceptable with the right underlay. Thick pile over 10mm is not suitable for permanent placement over UFH.
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Leave the thermostat alone after placing a new rug
When you first place a rug over an UFH floor, give the system a few days to recalibrate before adjusting the thermostat. The system will find its equilibrium. Immediately turning up the heat after placing a rug can cause the UFH element or pipes to work harder than necessary during the adjustment period.
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Rotate your rug every six months
Areas of the rug directly above UFH pipe runs or cables will receive slightly more heat than areas between them. Rotating the rug 180° every six months evens out the thermal exposure across the rug's surface, extending its life and preventing uneven fading or fibre stress.
- Choose kilim, jute, or cotton flatweave
- Use a UFH-rated underlay ≤ 0.5 TOG
- Check manufacturer's combined TOG limit
- Rotate the rug every 6 months
- Allow the system to recalibrate after placing the rug
- Keep jute rugs dry in UFH rooms
- Use standard foam underlay over UFH
- Place thick pile Gabbeh rugs permanently over UFH
- Exceed 1.5 combined TOG (rug + underlay)
- Immediately crank the thermostat after placing a new rug
- Ignore your UFH system's manufacturer guidelines
- Use very large rugs covering the entire floor of an electric UFH room
FAQ
Frequently asked questions
Can you put a rug on underfloor heating?
Yes — with the right rug. Flatweave rugs (kilim, cotton dhurrie, jute) are fully compatible with all UFH systems and add negligible thermal resistance. Low-pile wool rugs (pile height under 8mm) are acceptable when used with a UFH-rated underlay at 0.5 TOG or below. Thick-pile rugs (Gabbeh, deep-pile wool over 10mm) are not recommended as permanent coverings over UFH because their high TOG rating restricts heat transfer and increases system strain.
What is the maximum TOG for a rug on underfloor heating?
Most UFH manufacturers recommend a maximum combined TOG of 1.5 for the total floor covering (rug plus underlay together). Many specify 1.0 TOG or lower. As a practical guideline: keep the rug itself under 0.5–1.0 TOG and use a specialist UFH-rated underlay at 0.5 TOG or below. Always check your specific system's manufacturer documentation — electric UFH systems are typically more sensitive than hydronic (water-based) systems.
Is a kilim rug good for underfloor heating?
A kilim rug is the best possible choice for underfloor heating. Its zero-pile flatweave construction has a TOG of approximately 0.5 or below, meaning it adds minimal thermal resistance and allows your UFH system to heat the room efficiently. Kilim rugs are also reversible, easy to clean, and available in the geometric patterns that work particularly well in the open-plan and contemporary room types where UFH is most commonly installed.
Can jute rugs be used on underfloor heating?
Yes — jute's open-weave structure allows heat to pass through freely, making it well-suited to UFH rooms. The one caveat is moisture: if your UFH system is in a room with humidity concerns, use kilim instead. In dry, well-ventilated UFH rooms — living rooms, hallways, studies — a jute rug performs excellently and also happens to look particularly good on the warm stone and tile floors typical of UFH installations.
What underlay should I use with a rug on underfloor heating?
Use a specialist UFH-rated underlay rated at 0.5 TOG or below — not the standard foam underlay sold with carpet or laminate flooring. Standard foam underlays have TOG ratings of 1.5–2.5 on their own, which will exceed the safe threshold for most UFH systems. UFH-compatible underlays are available from most flooring specialists and are typically thinner, denser, and labelled specifically for use with heated floors.
Can I use a wool rug on underfloor heating?
It depends on pile depth. Low-pile wool rugs with a pile height under approximately 8mm are acceptable on most UFH systems when paired with a UFH-rated underlay at 0.5 TOG or below — giving a combined TOG within the 1.0–1.5 range most systems allow. Thick-pile wool Gabbeh rugs (10–18mm pile) are not recommended for permanent placement over UFH due to their higher TOG rating. If you want wool in a UFH room, choose a low-pile wool piece and check the combined TOG against your system's specification.
Will a rug damage my underfloor heating?
No — a rug will not physically damage a UFH system. The concern is efficiency, not damage. A rug with too high a TOG rating will insulate the floor and force the system to run longer and harder to achieve the target room temperature, increasing energy consumption and reducing efficiency. It will not burn out the system or cause structural damage. The recommendation to keep within TOG limits is about heating performance and running cost, not safety.
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