Essential reading for retailers and suppliers in the home improvement market

An award-winning underfloor heating system suppliers can rely on this heating season

Published: 14 September 2023 - DIY Week

ThermoSphere Ultimate is an award-winning electric underfloor heating cable with guaranteed reliability and the first and only cable to combine TwistedTwin construction and in-line joint technology, making it the strongest and most robust cable on the market.


ThermoSphere, a leading British-based electrical heating manufacturer, has been using its technical expertise to drive innovation for over 25 years.

In electric underfloor heating installation, most faults occur at the connection or ‘joint’ where the hot underfloor cable meets the cold cable running to the thermostat. These joints are typically crimped or soldered and then heat shrink-wrapped, making them three times thicker than the cable. Their bulky size forces installers to carve holes into the subfloor, insulation, and membrane mats using sharp blades and even grinders.

ThermoSphere Ultimate drastically improves installation time and removes all the issues installers currently face. ThermoSphere has incorporated the hot-to-cold joint connections into the primary manufacturing process, creating invisible joints and a reliable, award-winning cable that’s uniform in thickness from end-to-end.

If the cable fails in first 12 months due to manufacturing, ThermoSphere will replace the system and flooring*. The guarantee means merchants and installers never need to worry about damage or dead stock.

For more information on cable specifications, pricing and to get your hands on ThermoSphere Ultimate visit

* Available after warranty registration.


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