joist kit

The High Output Multi Room Joist Underfloor Heating Kit is designed for installing water underfloor heating between 400-centre timber joists across multiple rooms. It provides consistent and efficient heat output by using aluminium heat spreader plates to distribute warmth evenly across the floor surface.

This system is made for suspended timber floors where access from above is available. The aluminium spreader plates sit between joists and hold the 16mm underfloor heating pipe in place, improving heat transfer and reducing warm-up times.

The kit is configured for multi-room control, allowing individual zones to be managed independently when paired with the correct thermostats and actuators. This makes it suitable for whole-floor heating systems in extensions, renovations, or new builds.

Each kit includes all core components required for installation, including 16mm barrier pipe, stainless steel manifold, pump and mixing valve set, actuators, wiring centre, and all necessary fittings. Pipe lengths and manifold sizing are matched to the selected coverage area to help ensure correct system performance.

• Designed for suspended timber floors with joist installation
• Aluminium spreader plates for improved heat output and even heat distribution
• Multi-room zoning capability with individual room control
• 16mm oxygen barrier pipe for durability and system protection
• Pre-sized manifold and components based on floor area
• Compatible with standard floor finishes including carpet, laminate, and engineered wood

Warm water circulates through the pipe installed within the aluminium spreader plates. The plates transfer heat across the underside of the floor, allowing it to rise evenly into the room above. This creates a stable and consistent heating profile without the need for radiators.

• Timber joisted floors in domestic properties
• Renovation projects with existing suspended floors
• New build timber floor constructions
• Multi-room or whole-floor heating layouts

This kit is intended for use where floor heights cannot be increased and a low-profile underfloor heating solution is required within the existing joist structure.