Rugs for Underfloor Heating UK: What Works and What to Avoid

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.

Section 01

How underfloor heating and rugs interact

The right rug over UFH: the room stays warm, the rug performs beautifully, and nothing is compromised

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.

✅ Ideal

Kilim & cotton flatweave — the best UFH rug

TOG: ≤ 0.5 — Ideal for all UFH systems

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

Shop kilim rugs →

✅ Ideal

Natural jute — excellent thermal performance

TOG: ≤ 0.5 — Ideal for all UFH systems

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

Shop jute rugs →

⚠️ Works with care

Low-pile wool & wool-cotton blend — use with a UFH underlay

Low-pile wool — compatible with UFH when paired with a thin, UFH-rated underlay under 0.5 TOG

TOG: 0.5–1.2 depending on pile depth — use UFH-rated 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

Shop low-pile wool rugs →

✗ Avoid over UFH

Thick pile Gabbeh & deep-pile wool — not suitable for UFH

TOG: 1.5–2.5+ — not recommended over 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

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.

Top UFH pick · Kilim

Casa Blanc Kilim

Zero-pile flatweave. Geometric handwoven pattern. Compatible with all UFH systems — the definitive UFH rug choice.

Shop kilim collection →

Top UFH pick · Jute

Natural Jute Rug

Open-weave plant fibre — excellent heat flow, sustainable, and the perfect layering base over UFH floors.

Shop jute collection →

Top UFH pick · Braided

Bohemian Braided Jute

Hand-braided natural jute cord. Low thermal resistance. Works as a room accent or secondary zone rug over UFH.

Shop all rugs →

Section 06

5 rules for using rugs over underfloor heating

1. 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.

2. 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.

3. 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.

4. 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.

5. 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.

FAQ

Frequently asked questions