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HeatBoard Fusion 1200×600mm Structural Two-Part Chipboard and Fibre Cover Board UFH System – P6 Chipboard, Foil Cover Board, 28mm Build-Up, Joist-Direct, No Screed
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HeatBoard Fusion 1200×600mm Structural Two-Part Chipboard and Fibre Cover Board UFH System – P6 Chipboard, Foil Cover Board, 28mm Build-Up, Joist-Direct, No Screed

HeatBoard Fusion 1200×600mm Structural Two-Part Chipboard and Fibre Cover Board UFH System – P6 Chipboard, Foil Cover Board, 28mm Build-Up, Joist-Direct, No Screed

The HeatBoard Fusion is a structural two-part underfloor heating system designed for suspended timber floors. It combines a 22mm P6 load-bearing routed chipboard base with a 6mm moisture-resistant foil-backed fibre cover board, giving a total build-up of just 28mm above the joist. Unlike overlay systems, Fusion replaces the standard floor deck entirely — laying directly onto joists at up to 600mm centres with no separate chipboard or plywood subfloor needed. The P6 chipboard is pre-routed in two directions for 12mm pipe at 150mm centres, and the foil underside of the cover board reflects heat upward to maximise output and speed up warm-up times. Printed pipe-fixing guides on the cover board show exactly where pipes run beneath, preventing accidental fixings through the pipe when laying floor finishes. Dry installation — no screed, no curing time. Well-suited to heat pumps and low-temperature renewable heating systems. Panel size: 1,200 × 600mm (0.72m² per board pair). Minimum order: 20 boards (20 chipboard + 20 cover boards = 14.4m²).

28mm
Total Build-Up
22mm P6
Chipboard Base
6mm
Foil Cover Board
150mm
Pipe Centres
0.72m²
Per Board Pair
No Screed
Dry System
System Build-Up — Layer by Layer
Floor Build-Up — HeatBoard Fusion System
Floor Finish
Engineered wood, LVT, carpet, laminate or — with additional cement board — tile
6mm Cover Board
Moisture-resistant fibre board with foil underside and printed pipe fixing guides
12mm Pipe
Laid in pre-routed channels at 150mm centres
22mm P6 Chipboard
Load-bearing grooved base — replaces the standard floor deck
Joist (max 600mm centres)
Existing or new timber joists
Total Fusion build-up: 28mm above joist (22mm chipboard + 6mm cover board)
HeatBoard Range — Which System is Right for You?
System Build-Up Key Difference Best For
HeatBoard ONE (1200mm) 22mm Single panel, 4 grooves, no foil Budget-conscious new builds and retrofits
HeatBoard ONE PLUS / MAX PLUS 22mm Foil-coated single panel for faster warm-up Where improved response time is wanted without two-part assembly
HeatBoard ULTRA 22mm Aluminium heat-diffusion plates in grooves for maximum output High-demand rooms, larger areas, premium performance
HeatBoard Fusion ★ 28mm total Two-part structural system: P6 chipboard + foil-backed cover board Suspended floors needing structural deck + heating in one system

★ This product. All systems use 12mm pipe at 150mm centres on joists up to 600mm.

Key Features
Replaces the Standard Floor Deck — No Additional Subfloor Required
Unlike overlay UFH systems that sit on top of an existing floor deck, the HeatBoard Fusion replaces the floor deck entirely. The 22mm P6 chipboard base is load-bearing and installs directly onto the joists — eliminating the need to first lay a separate chipboard or plywood floor deck before fitting the heating system. This is the key structural distinction between Fusion and all other HeatBoard variants: it is a floor construction system that incorporates heating, not a heating system that overlays a floor.
Replaces floor deckDirect to joistsNo additional subfloor
28mm Total Build-Up — Minimal Height Increase Over Standard Timber Floor
The complete Fusion system adds just 28mm above the joist level — 22mm for the structural P6 chipboard base plus 6mm for the cover board. A standard 22mm chipboard floor deck alone adds 22mm; the Fusion therefore adds only 6mm more than a conventional chipboard deck while incorporating a fully functional underfloor heating system within those extra 6mm. This makes it particularly well suited to renovation projects where door clearances, threshold heights and floor transitions to adjacent rooms are critical constraints.
28mm total+6mm vs standard deckRetrofit-friendly
P6 Grade Chipboard — Structural and Moisture-Resistant
The chipboard base is P6 grade — the highest domestic grade for chipboard used in floor construction, rated for use in humid conditions. P6 chipboard is specifically classified for load-bearing applications in environments subject to moisture exposure, making it more appropriate for kitchen and bathroom renovations than standard P5 chipboard. It is tongue-and-groove on all four edges for a rigid, interlocking fit between boards.
P6 grade chipboardMoisture-resistantLoad-bearingT&G all round
Foil-Backed Cover Board — Maximises Heat Transfer Upward
The 6mm fibre cover board has a thick foil underside that functions as a reflective heat-spread layer. Heat rising from the 12mm pipe in the chipboard grooves is reflected upward by the foil rather than dissipating sideways or downward, improving the proportion of heat output that reaches the floor finish above and reducing the system's heat-up time. The cover board is also moisture-resistant, adding a secondary layer of protection over the pipe and chipboard.
Foil undersideReflective heat spreadMoisture-resistant cover
Printed Pipe-Fixing Guides — Reduce Risk of Damage During Finishing
The top surface of the cover board is printed with fixing guides showing exactly where the pipes run beneath. This is a critical safety feature: when laying floor finishes over the cover board, fixings and adhesives must be kept clear of the pipe routes. The printed guides make this immediately visible to anyone working on the floor, reducing the risk of a nail, screw or staple penetrating the pipe during subsequent floor covering installation.
Printed guidesPrevents pipe damageVisible pipe routes
Dual-Direction Pre-Routed Channels — Lay Panels in Any Orientation
The chipboard base features pre-routed channels in two directions, allowing the pipe layout to run either along the length or across the width of each panel. This gives the installer flexibility to optimise the pipe routing for each room's geometry without being constrained to a single orientation — useful in L-shaped rooms, narrow corridors or rooms with awkward joist directions.
Dual-direction channelsFlexible pipe routingAny room shape
No Joints Below the Floor — Continuous Pipe Run Beneath Each Zone
The HeatBoard system is designed for continuous pipe runs with no joints beneath the floor surface. Pipe enters and exits the board system at the manifold connections only — there are no couplers, pushfit joints or compression fittings hidden under the boards. This is a fundamental safety requirement for any buried or concealed pipe installation: any joint failure under the floor would be a significant and costly leak to locate and repair.
No underfloor jointsContinuous pipeLeak-safe design
Dry System — No Screed, No Curing Time
HeatBoard Fusion is a dry installation system — no screed is poured, no levelling compound is required, and there is no curing period before floor finishes can be laid. Once the boards are down, the pipe is routed, and the cover board is fitted, the installer can proceed immediately to the floor finish. This makes the system particularly practical for renovation projects where programme time is critical and returning the room to use quickly matters.
Dry installationNo screedNo curing wait
Suitable for Low-Temperature and Renewable Heating Systems
The high thermal efficiency of the Fusion system — foil-backed cover board, reflective heat spread, and 150mm pipe centres — means it can deliver effective heat output at lower flow temperatures. This makes it well-matched to air source heat pumps, ground source heat pumps and other condensing or renewable heat sources that operate most efficiently at flow temperatures of 35–45°C rather than the 70–80°C associated with gas boilers.
Heat pump compatibleLow-temp operationRenewable-ready
1200×600mm Panels — Easy to Handle on Site
At 1,200 × 600mm (0.72m² per board pair), the Fusion panels are sized to be manageable by a single person — lighter than 2,400mm boards and easier to carry upstairs, through tight doorways and into loft conversions or upper floors. Each purchase includes 1× chipboard base and 1× cover board. Minimum order: 20 boards (20 chipboard + 20 cover boards).
1200×600mm0.72m² per pairSingle-person handleMin. 20 boards
Technical Specifications
Chipboard Base
Grade P6 (load-bearing, moisture-resistant)
Thickness 22mm
Dimensions 1,200 × 600mm
Joint Type Tongue and groove all round
Pipe Channels Pre-routed dual-direction
Pipe Compatibility 12mm UFH pipe
Pipe Centre Spacing 150mm
Cover Board
Thickness 6mm
Dimensions 1,200 × 600mm
Material Moisture-resistant fibre board
Underside Foil-backed (reflective heat spread layer)
Top Surface Printed pipe-fixing guides
System Assembly
Total Build-Up 28mm (22mm chipboard + 6mm cover board)
Installation Method Dry — no screed, no levelling compound
Joist Compatibility Maximum 600mm centres
Panel Coverage 0.72m² per board pair (1 chipboard + 1 cover board)
Installation Direction Any — dual-direction routed channels
Underfloor Joints None required — continuous pipe run
Supply
Minimum Order 20 boards (= 20 chipboard + 20 cover boards = 14.4m²)
Coverage per 20-Board Order 14.4m²
ℹ Installation: Joists must be structurally sound, level and at maximum 600mm centres before installation. Ensure all pipe runs are continuous with no underfloor joints. Follow the printed fixing guides on the cover board when securing floor finishes — never fix through the pipe routes. All pipe connections must be pressure-tested before the floor finish is applied.
Frequently Asked Questions
What is the difference between HeatBoard Fusion and HeatBoard ONE?
The core difference is structural role. HeatBoard ONE is a single 22mm grooved chipboard panel that replaces the floor deck — the pipe sits in the grooves and you apply a separate overlay (such as the ThermRite 6mm fibre cement board) before laying the floor finish. HeatBoard Fusion is a two-part system: the same 22mm P6 chipboard base plus an integrated 6mm foil-backed fibre cover board that ships as part of the product. The cover board's foil underside improves heat transfer, and its printed pipe guides improve installation safety. Fusion is the higher-performance option with the cover board built into the specification from the outset.
Can I lay tiles over HeatBoard Fusion without an additional cement board?
The cover board in HeatBoard Fusion is a fibre board — not a fibre cement board. For ceramic or porcelain tile applications, additional advice from ThermRite / HeatBoard should be sought on whether the cover board alone provides a sufficient substrate for your tile adhesive or whether an additional 6mm fibre cement overlay is required. For most other floor finishes (engineered wood, LVT, laminate, carpet) the cover board provides a suitable surface.
What is the minimum order quantity?
The minimum order is 20 boards. Each board count includes 1× chipboard base and 1× cover board — so a 20-board order supplies 20 chipboard panels and 20 cover boards, covering 14.4m² of floor area.
Does HeatBoard Fusion work with heat pumps?
Yes — it is specifically recommended for use with low-temperature heat sources. Heat pumps operate most efficiently at flow temperatures of 35–45°C. The Fusion system's foil-backed cover board improves heat output at these lower temperatures, making it well-matched to air source and ground source heat pump installations. For best results the entire system (pipe sizing, manifold design, heat source, floor finish and insulation) should be designed together for the target flow temperature.
How do I size the system for my room?
Measure the floor area to be heated (total room area minus the footprint of fixed furniture such as kitchen units and bathroom fittings that will sit permanently over the boards). Each board pair covers 0.72m². Divide the target heated area by 0.72 to find the number of boards required, then round up to the nearest whole number. If the calculation gives fewer than 20 boards, the minimum order of 20 still applies.
Related Products
HeatBoard ONE 1200×600mm
Single-panel grooved chipboard — without cover board
ThermRite 6mm Fibre Cement Board
Optional cement board overlay for tile finishes
HeatBoard ONE ULTRA
Aluminium plate system for maximum heat output
12mm UFH Pipe
Compatible pipe for all HeatBoard systems
$45.89
HeatBoard Fusion 1200×600mm Structural Two-Part Chipboard and Fibre Cover Board UFH System – P6 Chipboard, Foil Cover Board, 28mm Build-Up, Joist-Direct, No Screed—
$45.89

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HeatBoard Fusion 1200×600mm Structural Two-Part Chipboard and Fibre Cover Board UFH System – P6 Chipboard, Foil Cover Board, 28mm Build-Up, Joist-Direct, No Screed - Image 2
HeatBoard Fusion 1200×600mm Structural Two-Part Chipboard and Fibre Cover Board UFH System – P6 Chipboard, Foil Cover Board, 28mm Build-Up, Joist-Direct, No Screed - Image 3

HeatBoard Fusion 1200×600mm Structural Two-Part Chipboard and Fibre Cover Board UFH System – P6 Chipboard, Foil Cover Board, 28mm Build-Up, Joist-Direct, No Screed

The HeatBoard Fusion is a structural two-part underfloor heating system designed for suspended timber floors. It combines a 22mm P6 load-bearing routed chipboard base with a 6mm moisture-resistant foil-backed fibre cover board, giving a total build-up of just 28mm above the joist. Unlike overlay systems, Fusion replaces the standard floor deck entirely — laying directly onto joists at up to 600mm centres with no separate chipboard or plywood subfloor needed. The P6 chipboard is pre-routed in two directions for 12mm pipe at 150mm centres, and the foil underside of the cover board reflects heat upward to maximise output and speed up warm-up times. Printed pipe-fixing guides on the cover board show exactly where pipes run beneath, preventing accidental fixings through the pipe when laying floor finishes. Dry installation — no screed, no curing time. Well-suited to heat pumps and low-temperature renewable heating systems. Panel size: 1,200 × 600mm (0.72m² per board pair). Minimum order: 20 boards (20 chipboard + 20 cover boards = 14.4m²).

28mm
Total Build-Up
22mm P6
Chipboard Base
6mm
Foil Cover Board
150mm
Pipe Centres
0.72m²
Per Board Pair
No Screed
Dry System
System Build-Up — Layer by Layer
Floor Build-Up — HeatBoard Fusion System
Floor Finish
Engineered wood, LVT, carpet, laminate or — with additional cement board — tile
6mm Cover Board
Moisture-resistant fibre board with foil underside and printed pipe fixing guides
12mm Pipe
Laid in pre-routed channels at 150mm centres
22mm P6 Chipboard
Load-bearing grooved base — replaces the standard floor deck
Joist (max 600mm centres)
Existing or new timber joists
Total Fusion build-up: 28mm above joist (22mm chipboard + 6mm cover board)
HeatBoard Range — Which System is Right for You?
System Build-Up Key Difference Best For
HeatBoard ONE (1200mm) 22mm Single panel, 4 grooves, no foil Budget-conscious new builds and retrofits
HeatBoard ONE PLUS / MAX PLUS 22mm Foil-coated single panel for faster warm-up Where improved response time is wanted without two-part assembly
HeatBoard ULTRA 22mm Aluminium heat-diffusion plates in grooves for maximum output High-demand rooms, larger areas, premium performance
HeatBoard Fusion ★ 28mm total Two-part structural system: P6 chipboard + foil-backed cover board Suspended floors needing structural deck + heating in one system

★ This product. All systems use 12mm pipe at 150mm centres on joists up to 600mm.

Key Features
Replaces the Standard Floor Deck — No Additional Subfloor Required
Unlike overlay UFH systems that sit on top of an existing floor deck, the HeatBoard Fusion replaces the floor deck entirely. The 22mm P6 chipboard base is load-bearing and installs directly onto the joists — eliminating the need to first lay a separate chipboard or plywood floor deck before fitting the heating system. This is the key structural distinction between Fusion and all other HeatBoard variants: it is a floor construction system that incorporates heating, not a heating system that overlays a floor.
Replaces floor deckDirect to joistsNo additional subfloor
28mm Total Build-Up — Minimal Height Increase Over Standard Timber Floor
The complete Fusion system adds just 28mm above the joist level — 22mm for the structural P6 chipboard base plus 6mm for the cover board. A standard 22mm chipboard floor deck alone adds 22mm; the Fusion therefore adds only 6mm more than a conventional chipboard deck while incorporating a fully functional underfloor heating system within those extra 6mm. This makes it particularly well suited to renovation projects where door clearances, threshold heights and floor transitions to adjacent rooms are critical constraints.
28mm total+6mm vs standard deckRetrofit-friendly
P6 Grade Chipboard — Structural and Moisture-Resistant
The chipboard base is P6 grade — the highest domestic grade for chipboard used in floor construction, rated for use in humid conditions. P6 chipboard is specifically classified for load-bearing applications in environments subject to moisture exposure, making it more appropriate for kitchen and bathroom renovations than standard P5 chipboard. It is tongue-and-groove on all four edges for a rigid, interlocking fit between boards.
P6 grade chipboardMoisture-resistantLoad-bearingT&G all round
Foil-Backed Cover Board — Maximises Heat Transfer Upward
The 6mm fibre cover board has a thick foil underside that functions as a reflective heat-spread layer. Heat rising from the 12mm pipe in the chipboard grooves is reflected upward by the foil rather than dissipating sideways or downward, improving the proportion of heat output that reaches the floor finish above and reducing the system's heat-up time. The cover board is also moisture-resistant, adding a secondary layer of protection over the pipe and chipboard.
Foil undersideReflective heat spreadMoisture-resistant cover
Printed Pipe-Fixing Guides — Reduce Risk of Damage During Finishing
The top surface of the cover board is printed with fixing guides showing exactly where the pipes run beneath. This is a critical safety feature: when laying floor finishes over the cover board, fixings and adhesives must be kept clear of the pipe routes. The printed guides make this immediately visible to anyone working on the floor, reducing the risk of a nail, screw or staple penetrating the pipe during subsequent floor covering installation.
Printed guidesPrevents pipe damageVisible pipe routes
Dual-Direction Pre-Routed Channels — Lay Panels in Any Orientation
The chipboard base features pre-routed channels in two directions, allowing the pipe layout to run either along the length or across the width of each panel. This gives the installer flexibility to optimise the pipe routing for each room's geometry without being constrained to a single orientation — useful in L-shaped rooms, narrow corridors or rooms with awkward joist directions.
Dual-direction channelsFlexible pipe routingAny room shape
No Joints Below the Floor — Continuous Pipe Run Beneath Each Zone
The HeatBoard system is designed for continuous pipe runs with no joints beneath the floor surface. Pipe enters and exits the board system at the manifold connections only — there are no couplers, pushfit joints or compression fittings hidden under the boards. This is a fundamental safety requirement for any buried or concealed pipe installation: any joint failure under the floor would be a significant and costly leak to locate and repair.
No underfloor jointsContinuous pipeLeak-safe design
Dry System — No Screed, No Curing Time
HeatBoard Fusion is a dry installation system — no screed is poured, no levelling compound is required, and there is no curing period before floor finishes can be laid. Once the boards are down, the pipe is routed, and the cover board is fitted, the installer can proceed immediately to the floor finish. This makes the system particularly practical for renovation projects where programme time is critical and returning the room to use quickly matters.
Dry installationNo screedNo curing wait
Suitable for Low-Temperature and Renewable Heating Systems
The high thermal efficiency of the Fusion system — foil-backed cover board, reflective heat spread, and 150mm pipe centres — means it can deliver effective heat output at lower flow temperatures. This makes it well-matched to air source heat pumps, ground source heat pumps and other condensing or renewable heat sources that operate most efficiently at flow temperatures of 35–45°C rather than the 70–80°C associated with gas boilers.
Heat pump compatibleLow-temp operationRenewable-ready
1200×600mm Panels — Easy to Handle on Site
At 1,200 × 600mm (0.72m² per board pair), the Fusion panels are sized to be manageable by a single person — lighter than 2,400mm boards and easier to carry upstairs, through tight doorways and into loft conversions or upper floors. Each purchase includes 1× chipboard base and 1× cover board. Minimum order: 20 boards (20 chipboard + 20 cover boards).
1200×600mm0.72m² per pairSingle-person handleMin. 20 boards
Technical Specifications
Chipboard Base
Grade P6 (load-bearing, moisture-resistant)
Thickness 22mm
Dimensions 1,200 × 600mm
Joint Type Tongue and groove all round
Pipe Channels Pre-routed dual-direction
Pipe Compatibility 12mm UFH pipe
Pipe Centre Spacing 150mm
Cover Board
Thickness 6mm
Dimensions 1,200 × 600mm
Material Moisture-resistant fibre board
Underside Foil-backed (reflective heat spread layer)
Top Surface Printed pipe-fixing guides
System Assembly
Total Build-Up 28mm (22mm chipboard + 6mm cover board)
Installation Method Dry — no screed, no levelling compound
Joist Compatibility Maximum 600mm centres
Panel Coverage 0.72m² per board pair (1 chipboard + 1 cover board)
Installation Direction Any — dual-direction routed channels
Underfloor Joints None required — continuous pipe run
Supply
Minimum Order 20 boards (= 20 chipboard + 20 cover boards = 14.4m²)
Coverage per 20-Board Order 14.4m²
ℹ Installation: Joists must be structurally sound, level and at maximum 600mm centres before installation. Ensure all pipe runs are continuous with no underfloor joints. Follow the printed fixing guides on the cover board when securing floor finishes — never fix through the pipe routes. All pipe connections must be pressure-tested before the floor finish is applied.
Frequently Asked Questions
What is the difference between HeatBoard Fusion and HeatBoard ONE?
The core difference is structural role. HeatBoard ONE is a single 22mm grooved chipboard panel that replaces the floor deck — the pipe sits in the grooves and you apply a separate overlay (such as the ThermRite 6mm fibre cement board) before laying the floor finish. HeatBoard Fusion is a two-part system: the same 22mm P6 chipboard base plus an integrated 6mm foil-backed fibre cover board that ships as part of the product. The cover board's foil underside improves heat transfer, and its printed pipe guides improve installation safety. Fusion is the higher-performance option with the cover board built into the specification from the outset.
Can I lay tiles over HeatBoard Fusion without an additional cement board?
The cover board in HeatBoard Fusion is a fibre board — not a fibre cement board. For ceramic or porcelain tile applications, additional advice from ThermRite / HeatBoard should be sought on whether the cover board alone provides a sufficient substrate for your tile adhesive or whether an additional 6mm fibre cement overlay is required. For most other floor finishes (engineered wood, LVT, laminate, carpet) the cover board provides a suitable surface.
What is the minimum order quantity?
The minimum order is 20 boards. Each board count includes 1× chipboard base and 1× cover board — so a 20-board order supplies 20 chipboard panels and 20 cover boards, covering 14.4m² of floor area.
Does HeatBoard Fusion work with heat pumps?
Yes — it is specifically recommended for use with low-temperature heat sources. Heat pumps operate most efficiently at flow temperatures of 35–45°C. The Fusion system's foil-backed cover board improves heat output at these lower temperatures, making it well-matched to air source and ground source heat pump installations. For best results the entire system (pipe sizing, manifold design, heat source, floor finish and insulation) should be designed together for the target flow temperature.
How do I size the system for my room?
Measure the floor area to be heated (total room area minus the footprint of fixed furniture such as kitchen units and bathroom fittings that will sit permanently over the boards). Each board pair covers 0.72m². Divide the target heated area by 0.72 to find the number of boards required, then round up to the nearest whole number. If the calculation gives fewer than 20 boards, the minimum order of 20 still applies.
Related Products
HeatBoard ONE 1200×600mm
Single-panel grooved chipboard — without cover board
ThermRite 6mm Fibre Cement Board
Optional cement board overlay for tile finishes
HeatBoard ONE ULTRA
Aluminium plate system for maximum heat output
12mm UFH Pipe
Compatible pipe for all HeatBoard systems

Product Information

Shipping & Returns

Description

The HeatBoard Fusion is a structural two-part underfloor heating system designed for suspended timber floors. It combines a 22mm P6 load-bearing routed chipboard base with a 6mm moisture-resistant foil-backed fibre cover board, giving a total build-up of just 28mm above the joist. Unlike overlay systems, Fusion replaces the standard floor deck entirely — laying directly onto joists at up to 600mm centres with no separate chipboard or plywood subfloor needed. The P6 chipboard is pre-routed in two directions for 12mm pipe at 150mm centres, and the foil underside of the cover board reflects heat upward to maximise output and speed up warm-up times. Printed pipe-fixing guides on the cover board show exactly where pipes run beneath, preventing accidental fixings through the pipe when laying floor finishes. Dry installation — no screed, no curing time. Well-suited to heat pumps and low-temperature renewable heating systems. Panel size: 1,200 × 600mm (0.72m² per board pair). Minimum order: 20 boards (20 chipboard + 20 cover boards = 14.4m²).

28mm
Total Build-Up
22mm P6
Chipboard Base
6mm
Foil Cover Board
150mm
Pipe Centres
0.72m²
Per Board Pair
No Screed
Dry System
System Build-Up — Layer by Layer
Floor Build-Up — HeatBoard Fusion System
Floor Finish
Engineered wood, LVT, carpet, laminate or — with additional cement board — tile
6mm Cover Board
Moisture-resistant fibre board with foil underside and printed pipe fixing guides
12mm Pipe
Laid in pre-routed channels at 150mm centres
22mm P6 Chipboard
Load-bearing grooved base — replaces the standard floor deck
Joist (max 600mm centres)
Existing or new timber joists
Total Fusion build-up: 28mm above joist (22mm chipboard + 6mm cover board)
HeatBoard Range — Which System is Right for You?
System Build-Up Key Difference Best For
HeatBoard ONE (1200mm) 22mm Single panel, 4 grooves, no foil Budget-conscious new builds and retrofits
HeatBoard ONE PLUS / MAX PLUS 22mm Foil-coated single panel for faster warm-up Where improved response time is wanted without two-part assembly
HeatBoard ULTRA 22mm Aluminium heat-diffusion plates in grooves for maximum output High-demand rooms, larger areas, premium performance
HeatBoard Fusion ★ 28mm total Two-part structural system: P6 chipboard + foil-backed cover board Suspended floors needing structural deck + heating in one system

★ This product. All systems use 12mm pipe at 150mm centres on joists up to 600mm.

Key Features
Replaces the Standard Floor Deck — No Additional Subfloor Required
Unlike overlay UFH systems that sit on top of an existing floor deck, the HeatBoard Fusion replaces the floor deck entirely. The 22mm P6 chipboard base is load-bearing and installs directly onto the joists — eliminating the need to first lay a separate chipboard or plywood floor deck before fitting the heating system. This is the key structural distinction between Fusion and all other HeatBoard variants: it is a floor construction system that incorporates heating, not a heating system that overlays a floor.
Replaces floor deckDirect to joistsNo additional subfloor
28mm Total Build-Up — Minimal Height Increase Over Standard Timber Floor
The complete Fusion system adds just 28mm above the joist level — 22mm for the structural P6 chipboard base plus 6mm for the cover board. A standard 22mm chipboard floor deck alone adds 22mm; the Fusion therefore adds only 6mm more than a conventional chipboard deck while incorporating a fully functional underfloor heating system within those extra 6mm. This makes it particularly well suited to renovation projects where door clearances, threshold heights and floor transitions to adjacent rooms are critical constraints.
28mm total+6mm vs standard deckRetrofit-friendly
P6 Grade Chipboard — Structural and Moisture-Resistant
The chipboard base is P6 grade — the highest domestic grade for chipboard used in floor construction, rated for use in humid conditions. P6 chipboard is specifically classified for load-bearing applications in environments subject to moisture exposure, making it more appropriate for kitchen and bathroom renovations than standard P5 chipboard. It is tongue-and-groove on all four edges for a rigid, interlocking fit between boards.
P6 grade chipboardMoisture-resistantLoad-bearingT&G all round
Foil-Backed Cover Board — Maximises Heat Transfer Upward
The 6mm fibre cover board has a thick foil underside that functions as a reflective heat-spread layer. Heat rising from the 12mm pipe in the chipboard grooves is reflected upward by the foil rather than dissipating sideways or downward, improving the proportion of heat output that reaches the floor finish above and reducing the system's heat-up time. The cover board is also moisture-resistant, adding a secondary layer of protection over the pipe and chipboard.
Foil undersideReflective heat spreadMoisture-resistant cover
Printed Pipe-Fixing Guides — Reduce Risk of Damage During Finishing
The top surface of the cover board is printed with fixing guides showing exactly where the pipes run beneath. This is a critical safety feature: when laying floor finishes over the cover board, fixings and adhesives must be kept clear of the pipe routes. The printed guides make this immediately visible to anyone working on the floor, reducing the risk of a nail, screw or staple penetrating the pipe during subsequent floor covering installation.
Printed guidesPrevents pipe damageVisible pipe routes
Dual-Direction Pre-Routed Channels — Lay Panels in Any Orientation
The chipboard base features pre-routed channels in two directions, allowing the pipe layout to run either along the length or across the width of each panel. This gives the installer flexibility to optimise the pipe routing for each room's geometry without being constrained to a single orientation — useful in L-shaped rooms, narrow corridors or rooms with awkward joist directions.
Dual-direction channelsFlexible pipe routingAny room shape
No Joints Below the Floor — Continuous Pipe Run Beneath Each Zone
The HeatBoard system is designed for continuous pipe runs with no joints beneath the floor surface. Pipe enters and exits the board system at the manifold connections only — there are no couplers, pushfit joints or compression fittings hidden under the boards. This is a fundamental safety requirement for any buried or concealed pipe installation: any joint failure under the floor would be a significant and costly leak to locate and repair.
No underfloor jointsContinuous pipeLeak-safe design
Dry System — No Screed, No Curing Time
HeatBoard Fusion is a dry installation system — no screed is poured, no levelling compound is required, and there is no curing period before floor finishes can be laid. Once the boards are down, the pipe is routed, and the cover board is fitted, the installer can proceed immediately to the floor finish. This makes the system particularly practical for renovation projects where programme time is critical and returning the room to use quickly matters.
Dry installationNo screedNo curing wait
Suitable for Low-Temperature and Renewable Heating Systems
The high thermal efficiency of the Fusion system — foil-backed cover board, reflective heat spread, and 150mm pipe centres — means it can deliver effective heat output at lower flow temperatures. This makes it well-matched to air source heat pumps, ground source heat pumps and other condensing or renewable heat sources that operate most efficiently at flow temperatures of 35–45°C rather than the 70–80°C associated with gas boilers.
Heat pump compatibleLow-temp operationRenewable-ready
1200×600mm Panels — Easy to Handle on Site
At 1,200 × 600mm (0.72m² per board pair), the Fusion panels are sized to be manageable by a single person — lighter than 2,400mm boards and easier to carry upstairs, through tight doorways and into loft conversions or upper floors. Each purchase includes 1× chipboard base and 1× cover board. Minimum order: 20 boards (20 chipboard + 20 cover boards).
1200×600mm0.72m² per pairSingle-person handleMin. 20 boards
Technical Specifications
Chipboard Base
Grade P6 (load-bearing, moisture-resistant)
Thickness 22mm
Dimensions 1,200 × 600mm
Joint Type Tongue and groove all round
Pipe Channels Pre-routed dual-direction
Pipe Compatibility 12mm UFH pipe
Pipe Centre Spacing 150mm
Cover Board
Thickness 6mm
Dimensions 1,200 × 600mm
Material Moisture-resistant fibre board
Underside Foil-backed (reflective heat spread layer)
Top Surface Printed pipe-fixing guides
System Assembly
Total Build-Up 28mm (22mm chipboard + 6mm cover board)
Installation Method Dry — no screed, no levelling compound
Joist Compatibility Maximum 600mm centres
Panel Coverage 0.72m² per board pair (1 chipboard + 1 cover board)
Installation Direction Any — dual-direction routed channels
Underfloor Joints None required — continuous pipe run
Supply
Minimum Order 20 boards (= 20 chipboard + 20 cover boards = 14.4m²)
Coverage per 20-Board Order 14.4m²
ℹ Installation: Joists must be structurally sound, level and at maximum 600mm centres before installation. Ensure all pipe runs are continuous with no underfloor joints. Follow the printed fixing guides on the cover board when securing floor finishes — never fix through the pipe routes. All pipe connections must be pressure-tested before the floor finish is applied.
Frequently Asked Questions
What is the difference between HeatBoard Fusion and HeatBoard ONE?
The core difference is structural role. HeatBoard ONE is a single 22mm grooved chipboard panel that replaces the floor deck — the pipe sits in the grooves and you apply a separate overlay (such as the ThermRite 6mm fibre cement board) before laying the floor finish. HeatBoard Fusion is a two-part system: the same 22mm P6 chipboard base plus an integrated 6mm foil-backed fibre cover board that ships as part of the product. The cover board's foil underside improves heat transfer, and its printed pipe guides improve installation safety. Fusion is the higher-performance option with the cover board built into the specification from the outset.
Can I lay tiles over HeatBoard Fusion without an additional cement board?
The cover board in HeatBoard Fusion is a fibre board — not a fibre cement board. For ceramic or porcelain tile applications, additional advice from ThermRite / HeatBoard should be sought on whether the cover board alone provides a sufficient substrate for your tile adhesive or whether an additional 6mm fibre cement overlay is required. For most other floor finishes (engineered wood, LVT, laminate, carpet) the cover board provides a suitable surface.
What is the minimum order quantity?
The minimum order is 20 boards. Each board count includes 1× chipboard base and 1× cover board — so a 20-board order supplies 20 chipboard panels and 20 cover boards, covering 14.4m² of floor area.
Does HeatBoard Fusion work with heat pumps?
Yes — it is specifically recommended for use with low-temperature heat sources. Heat pumps operate most efficiently at flow temperatures of 35–45°C. The Fusion system's foil-backed cover board improves heat output at these lower temperatures, making it well-matched to air source and ground source heat pump installations. For best results the entire system (pipe sizing, manifold design, heat source, floor finish and insulation) should be designed together for the target flow temperature.
How do I size the system for my room?
Measure the floor area to be heated (total room area minus the footprint of fixed furniture such as kitchen units and bathroom fittings that will sit permanently over the boards). Each board pair covers 0.72m². Divide the target heated area by 0.72 to find the number of boards required, then round up to the nearest whole number. If the calculation gives fewer than 20 boards, the minimum order of 20 still applies.
Related Products
HeatBoard ONE 1200×600mm
Single-panel grooved chipboard — without cover board
ThermRite 6mm Fibre Cement Board
Optional cement board overlay for tile finishes
HeatBoard ONE ULTRA
Aluminium plate system for maximum heat output
12mm UFH Pipe
Compatible pipe for all HeatBoard systems