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Carpet Floors

Warm carpets feel great underfoot, but they also help keep your home healthy by keeping humidity levels low, keeping dust mites and other allergens in check.

underfloor heating carpet

Benefits of Under Carpet Heating

Underfloor heating is a compatible heating system with carpet. Both electric and warm water systems are perfectly suitable floor heating solutions for use under a carpet floor covering.

There are several benefits to having under carpet heating. First of all hygiene. Carpets tend to absorb dust. Furthermore, the hot air from conventional radiators causes the air in the room to circulate. As a result of this, they circulate the dust and impurities. Underfloor heating heats up objects rather than the air and does not cause air circulation. Radiant heat is, therefore, the most suitable heating system for carpets.

foil heater

Electric Heating Systems for Carpet

The most commonly used floor heating solution with carpet is the Warmup Foil Heater. The Foil Heater is specifically suitable for use with floating floors and large and regular shaped areas. The super-thin, fully earthed, flat aluminium foil will not raise the floor levels visibly, hence why it makes a great solution for renovations.

When installing the system, the concrete or plywood base on which the heating system is installed on should have additional insulation. This promotes the efficient operation of the system. Warmup insulation boards or Warmup Insulated Underlay are designed to give the best performance for the floor heater to provide heat through the underlay and the carpet on top.

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Thermal Resistance

When choosing your carpet flooring, attention must be paid to the overall thickness of any materials above the heater including any underlays and overlays.

The underlay should have low thermal resistance and the carpet should be hessian backed to promote efficient operation of the system. A felt underlay should not be used as it may create a thermal blocker hindering the performance of the system.

Tog Value

Everything above the heater, including underlay, overlay, and final floor finish needs to be in the limits set in the table below. The typical carpet is 1.0 to 2 tog, but you should always check with the manufacturer the suitability for underfloor heating and ensure that the overall tog value (including any underlays or overlays) does not exceed the 1.5. It is not recommended to install underfloor heating with carpet if the limits below are not met. This may hinder the performance of the system and result in the system not working as desired.

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Transfer of Heat Limits

The floor temperature should not exceed 81°F (27 °C), which is secured by using a thermostat, means that the floor heating system is restricted to a certain maximum heat output. If you need help determining the heating requirement of your room and deciding on the suitable underfloor heating system, our expert team is available to help and can give you an estimate for heat loss and the heat output of the system and help you to choose the right products to your home.

The figures below are for electric underfloor heating systems only. Water systems have a broader range of limits due to the variables of the specification.

Transfer of heat limits
Tog 1.5 (Unless otherwise stated)
RSI  0.15m² K/W (Unless otherwise stated)


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Warmup offers an extensive range of electric and water floor systems compatible with all floor types, rooms and projects.

Electric Systems

  • ✓ Ideal for zones less than 25m²
  • ✓ Ideal for single rooms
  • ✓ Does not alter floor levels
  • ✓ Great for renovations

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Water Systems

  • ✓ Ideal for larger zones over 25m²
  • ✓ Rapid auto heat loss calculations
  • ✓ Compatible with existing central heating systems
  • ✓ Great for new-builds

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Projects Division Consultation

  • ✓ Bespoke heating solutions for new-build projects and larger renovations
  • ✓ Dedicated team to work with you
  • ✓ World-class expertise in R&D, building regulations and energy performance
  • ✓ Detailed system layouts for each stage of the project

Get In Touch with Warmup’s Projects Division
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For areas of 24m2 or more, use our full quoting system
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