18mm ThermRite™ HIGH OUTPUT Low Profile Floor Panel – 4 Grooves at 150mm Centres

THE IDEAL LOW PROFILE SOLUTION FOR INSTALLATION OF A WATER SYSTEM ONTO AN EXISTING FLOOR AND TILE DIRECTLY ON TOP

The ThermRite™ Solid Floor System is a high-performance underfloor heating solution using a rigid XPS insulation panel for outstanding compressive strength and thermal insulation. Designed for use beneath tile and stone floors, this system is suitable for both domestic and commercial applications.

With pipe spacing at 150mm centres, it meets the requirements of standard floor heating in rooms insulated to current building standards. Each 18mm thick panel is constructed from high-grade XPS (300 kPa), making it ideal for areas that demand robust, stable underfloor support.

Simply bond the panels to a solid screed or 18mm+ plywood deck, insert 12mm pipe into the pre-grooved channels, and cover with a 5mm self-levelling layer before applying your tiled finish.

Key Features:

• High Compressive Strength (XPS 300 kPa) – Ideal for tiled floors
• Supports 12mm Pipe @ 150mm Centres
• Panel Size: 1200mm x 600mm x 18mm (0.72m² per panel)
• Grooved with 4 Runs + Flow & Return Channels
• No Fixings Required – Secure Pipe Retention
• Fast Installation – Just Bond, Pipe, Level, and Tile
• Suitable for New Builds or Renovations

Whether you're working on a kitchen, bathroom, or large commercial space, this system offers the durability, insulation performance, and ease of use needed to deliver long-lasting, energy-efficient heating beneath tiled finishes.

Minimum Order Quantity: 10 Panels

Click for: Product Installation & Data Sheet

Frequently Asked Questions

• What type of floors is this panel best for?

The ThermRite™ Solid Floor System is designed for tile and stone floor finishes, offering high compressive strength and thermal efficiency.

• What size pipe does it accept?

The panel is grooved to securely hold 12mm underfloor heating pipe—no additional clips are required.

• What is the recommended pipe spacing?

Pipes should be installed at 150mm centres, ideal for standard heat-loss rooms and efficient heat distribution.

• What subfloors can this panel be laid on?

The panels must be bonded to a structurally sound solid screed or minimum 18mm floor-grade plywood.

• Is a screed required over the top?

Tiling can be done directly over the top of the panels after a multi-surface primer has been used.