ThermoSphere Ultimate 75m is a continuous electric underfloor heating cable designed for efficient, reliable warmth and frost protection. Ideal for bathrooms, kitchens and utility rooms; installs under screed or tile adhesive for even heat distribution.

Continuous cable length: 75 metres
Use cases: underfloor heating, frost protection, pipe trace
Low energy consumption with high thermal output
Suitable for wet-room and tiled installations when installed per manufacturer guidelines
5-year warranty (manufacturer)

Related: Underfloor Heating • Installation Guides

ThermoSphere Ultimate Underfloor Heating Cable

Combines advanced TwistedTwin™ construction with innovative In-Line Joint technology for next-level reliability.
Invisible In-Line Joint keeps the cable at a consistent 4mm thickness, removing bulky joins and protecting waterproof layers.
No need to cut into insulation boards or subfloors, helping preserve installation integrity and speed up fitting.
TwistedTwin™ technology neutralises cable stress and reduces memory effect for easier handling and flatter installation.
Flexible and durable cable design lays smoothly for a professional finish every time.
Fully compatible with all major decoupling membrane systems for versatile floor build options.
Dual heat outputs: approx. 195W/m² with 2-stud spacing (ideal for wet rooms) or 130W/m² with 3-stud spacing (suitable for primary heating).
IP68 waterproof rating makes it safe for bathrooms, showers, and other wet environments.
Consistent profile helps avoid floor-level differences and simplifies floor finishing.
Designed to deliver long-term, energy-efficient radiant warmth with minimal maintenance.

Technical Details

Cable Diameter	4.0mm (consistent profile)
Internal Construction	TwistedTwin™ dual core
Voltage	230V
Waterproof Rating	IP68
Warranty	Lifetime manufacturer’s guarantee

Electric Underfloor Heating Cable - ThermoSphere Ultimate 75 LM