Which statement correctly describes typical pre-made rolls of electric radiant flexible sheet underfloor heating?

Which statement correctly describes typical pre-made rolls of electric radiant flexible sheet underfloor heating?

• A. They must be installed within 100 mm of pipe work.
• B. They are typically 500 mm wide and 2–9 m long, rated 100–200 W/m², with heating cables attached to adhesive fibre glass.
• C. The circuit is not protected by an RCD.
• D. They should be installed under baths and toilets.

Answer: (B)

Typical pre-made rolls of electric radiant flexible sheet underfloor heating come as a mat with the heating element bonded to a backing. The standard width is about 500 mm, and lengths usually range from 2 to 9 meters, making it easy to fit different room sizes. The heat output is commonly 100–200 W per square metre, which provides comfortable warmth without overloading the circuit. The heating cables are attached to an adhesive fiberglass backing so the mat stays flat and heat spreads evenly when you install it over a prepared subfloor. In wet areas, the circuit must be protected by an RCD for safety, so the idea that it isn’t protected is not correct. And these mats aren’t installed under baths and toilets; they’re laid in the floor space under the finished floor covering, with plumbing fixtures excluded.

Typical pre-made rolls of electric radiant flexible sheet underfloor heating come as a mat with the heating element bonded to a backing. The standard width is about 500 mm, and lengths usually range from 2 to 9 meters, making it easy to fit different room sizes. The heat output is commonly 100–200 W per square metre, which provides comfortable warmth without overloading the circuit. The heating cables are attached to an adhesive fiberglass backing so the mat stays flat and heat spreads evenly when you install it over a prepared subfloor. In wet areas, the circuit must be protected by an RCD for safety, so the idea that it isn’t protected is not correct. And these mats aren’t installed under baths and toilets; they’re laid in the floor space under the finished floor covering, with plumbing fixtures excluded.