The ThermoSphere Mesh 150W/m² is a self-adhesive electric underfloor heating mat for tile and stone floors, manufactured in Great Britain. At 150W/m² it is the most popular output in the Mesh range — the ideal primary heat source in well-insulated domestic rooms when at least 85% of the floor area is covered. Installs wire-side-down with the self-adhesive backing, protecting the TwistedTwin cable during tiling. Features: TwistedTwin cable with full earth protection, IP68, LayFlat 4mm cold tail, 3.5mm total thickness. Lifetime warranty on registration.
150W/m²
Output
3.5mm
Thickness
IP68
Wet Room Safe
TwistedTwin
Stress-Free
Made in
Great Britain
Lifetime
Warranty
Key Features
Self-Adhesive Mesh — Wire-Side-Down Installation
The fully self-adhesive fibreglass mesh sticks wire-side-down to the substrate. This protects the TwistedTwin cable during foot traffic and tiling, while holding the mat flat for self-levelling. No additional fixing tape needed.
Self-adhesiveWire-side-downProtects cable
150W/m² Output — Primary Heat Source
At 150W/m², this mat is best suited as a primary heat source in well-insulated rooms — the most popular output. For primary heating, cover at least 85% of the floor area.
ThermoSphere's proprietary TwistedTwin cable uses a twisted-pair conductor construction that neutralises mechanical stress, preventing the fractures that develop in conventional cables under repeated thermal cycling. A continuous full earth braid runs the entire cable length — making these among the safest electric underfloor heating cables in the UK.
TwistedTwinFull earth braidStress-free
LayFlat Technology — 4mm Cold Tail
The LayFlat cold tail is only 4mm thick — far thinner than conventional cold tails — making it straightforward to conceal within the tile adhesive layer without any raised ridge in the finished floor.
4mm cold tailConcealed in adhesive
Tile and Stone — or Other Finishes with Overlay
Primarily for tile and stone floors tiled directly over. With self-levelling compound, also suitable under wood and vinyl. Can be installed on tiled walls.
Tile / StoneWood/vinyl with overlayWall tiles possible
IP68 — Safe in Wet Rooms and Bathrooms
IP68 rated — completely impervious to moisture, safe in wet rooms, shower areas and bathrooms when installed with appropriate accessories.
IP68Wet room safe
Lifetime Warranty — Stays with the Property
Backed by a lifetime warranty when registered online. Uniquely, the warranty transfers with the property on sale — the new owners remain covered.
Lifetime warrantyProperty warranty
Technical Specifications
Technical Data
Voltage
230V / 50Hz
Output
150 W/m²
Total Thickness
3.5mm
Area Range
1.5 – 12.0 m²
Mesh Material
Self-adhesive fibreglass
Cable Insulation
FEP and HR-PVC
Protection Rating
IP68
Recommended Max Floor Temperature
27°C (limited by thermostat controls)
Warranty
Lifetime (online registration required)
Country of Origin
United Kingdom
ℹ Installation: All electrical connections must be made by a qualified electrician in accordance with BS 7671. Register your product with ThermoSphere online to activate your lifetime warranty.
Frequently Asked Questions
What output do I need for my room?
150W/m² is the most popular choice — ideal as a primary heat source in most well-insulated UK domestic rooms. Use 200W/m² for conservatories or rooms with high heat loss.
Can I install this in a wet room?
Yes — IP68 makes it safe in wet rooms and shower areas with appropriate waterproofing accessories.
Can I cut the heating cable?
Never cut the cable. Cut only the mesh backing between cable runs to change direction.
What floor finishes are compatible?
Primarily tile and stone tiled directly over. With self-levelling compound overlay, also suitable under wood and vinyl.
How much area do I need to heat?
Aim to cover at least 85% of the walkable floor area for effective even heating. Exclude fixed furniture footprints (baths, toilets, kitchen units).
Related Products
ThermoSphere Mesh 100W/m²
Lower output variant
ThermoSphere Mesh 200W/m²
Higher output variant
ThermoSphere Foil 140W/m²
For wood, carpet and vinyl floors
ThermoSphere T-MO Thermostat
Smart thermostat
BTU & WATT Calculator
Room Dimensions
Room Type
Living Room
Bedroom
Kitchen
Bathroom
Conservatory
Hallway
Glazing Type
Single Glazed
Double Glazed
Triple Glazed
External Walls
0 Wall
1 Wall
2 Walls
3 Walls
4 Walls
Insulation Level
Poor
Average
Good (New Build)
Required Heating
0
Watts
0
BTUs
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